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VERSION:2.0
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BEGIN:VEVENT
SUMMARY:Kaon Kaon scattering at maximal isospin from $N_f=2+1+1$ twisted m
ass lattice QCD
DTSTART;VALUE=DATE-TIME:20160726T153000Z
DTEND;VALUE=DATE-TIME:20160726T155000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2322@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christopher Helmes (HISKP Universität Bonn)\nWe pre
sent results for the interaction of two Kaons at maximal\nisospin. The cal
culation is based on 2+1+1 flavour gauge\nconfigurations generated by the
ETM Collaboration featuring\npion masses ranging from about 230 MeV to 450
MeV at three\nvalues of the lattice spacing. The elastic scattering lengt
h\n$a_0$ is calculated at several values of the bare\nstrange quark and li
ght quark masses. Chiral extrapolations\nto the physical point are present
ed and compared to other lattice\nresults.\n\nhttps://conference.ippp.dur.
ac.uk/event/470/contributions/2322/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2322/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress on three-particle quantization condition
DTSTART;VALUE=DATE-TIME:20160726T144000Z
DTEND;VALUE=DATE-TIME:20160726T150000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2350@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Stephen Sharpe (University of Washington)\nWe report
progress on extending the relativistic model-independent quantization con
dition for three particles to a broader class of theories\, and in checkin
g the formalism. Topics that will be touched on are: (i) the extension to
include the possibility of 2->3 and 3->2 transitions and (ii) checks of th
e formalism by comparing to threshold expansions and to the energy shift o
f a three-particle Efimov-like bound state.\n\nhttps://conference.ippp.dur
.ac.uk/event/470/contributions/2350/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2350/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the continuum limit with improved Wilson fermions employin
g open boundary conditions. Part 1.
DTSTART;VALUE=DATE-TIME:20160729T153000Z
DTEND;VALUE=DATE-TIME:20160729T155000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2362@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Wolfgang Soeldner (Regensburg University)\nWe presen
t results obtained by RQCD on various observables\, obtained from simulati
ons of $N_f=2+1$ flavours of non-perturbatively order-$a$ improved Wilson
fermions\, employing open boundary conditions in time\, that were created
within the CLS (Coordinated Lattice Simulations) effort. Configurations at
five different values of the lattice spacing\, ranging from 0.086 fm down
to below 0.04 fm exist and many quark mass combinations\, in particular a
long a line of an (almost) constant sum of quark masses and a constant ren
ormalized strange quark mass have been generated. Several key observables\
, mostly meson and baryon masses have been computed\, and these results wi
ll be presented. In some cases a precise and controlled extrapolation to t
he continuum limit has become possible.\n\nhttps://conference.ippp.dur.ac.
uk/event/470/contributions/2362/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2362/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Including heavy spin effects in a lattice QCD study of static-stat
ic-light-light tetraquarks
DTSTART;VALUE=DATE-TIME:20160725T141500Z
DTEND;VALUE=DATE-TIME:20160725T143500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2365@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Pedro Bicudo (Universidade de Lisboa)\nIn previous w
orks we predicted the existence of a $\\bar{b} \\bar{b} u d$ tetraquark wi
th quantum numbers $I(J^P) = 0(1^+)$ using the static approximation for th
e $\\bar{b}$ quarks and neglecting heavy spin effects. Since the binding e
nergy is of the same order as expected for these heavy spin effects\, it i
s essential to include them in the computation. Here we present a correspo
nding method and show evidence that binding is only slightly weakened and
that the $\\bar{b} \\bar{b} u d$ tetraquark persists.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2365/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2365/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD study of heavy-heavy-light-light tetraquark candidates
DTSTART;VALUE=DATE-TIME:20160725T143500Z
DTEND;VALUE=DATE-TIME:20160725T145500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2369@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Antje Peters (Goethe-Universität Frankfurt am Main)
\nWe study $\\bar{b} \\bar{b} u d$ and $\\bar{b} b u \\bar{d}$ four-quark
systems using lattice QCD. The heavy b quarks are treated either in the st
atic approximation or by using NRQCD. Both for $\\bar{b} \\bar{b} u d$ (qu
antum numbers $I(J^P) = 0(1^+)$) and for $\\bar{b} b u \\bar{d}$ (quantum
numbers of $Z_b$\, $I(J^P) = 1(1^+)$) our results indicate the existence o
f a four-quark bound state\, i.e. a tetraquark.\n\nhttps://conference.ippp
.dur.ac.uk/event/470/contributions/2369/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2369/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadron scattering and resonances
DTSTART;VALUE=DATE-TIME:20160726T142000Z
DTEND;VALUE=DATE-TIME:20160726T144000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2370@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Raul Briceno (Thomas Jefferson National Accelerator
Facillity)\nIn this talk\, I present recent progress towards the determina
tion of resonant systems via lattice QCD. The truncation of the volume --
necessary for lattice QCD calculations -- significantly alters the analyti
c structure of the theory. For scattering processes involving two-hadron s
tates\, this can be circumvented by utilizing formalism to map finite-volu
me quantities obtained onto the desired infinite-volume observables. I ill
ustrate the power of these techniques by highlighting some important examp
les in the light sector of QCD.\n\nhttps://conference.ippp.dur.ac.uk/event
/470/contributions/2370/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2370/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coupled-channel analysis of $D\\pi$\, $D\\eta$ and $D_{s}\\bar{K}$
scattering using lattice QCD
DTSTART;VALUE=DATE-TIME:20160728T140000Z
DTEND;VALUE=DATE-TIME:20160728T142000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2378@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Graham Moir (University of Cambridge)\nWe present an
extensive study of isospin $1/2$ coupled-channel $D\\pi$\, $D\\eta$ and $
D_{s}\\bar{K}$ scattering\,\nas well as isospin $3/2$ elastic $D\\pi$ scat
tering\, from $N_{f} = 2+1$ lattice QCD. Our use of distillation in combin
ation with variationally optimised interpolating operators allows us to ex
tract statistically precise two-meson spectra\, which we use to constrain
scattering amplitudes as a function of energy. We interpret our results in
terms of poles in the scattering matrix\, finding a near-threshold bound
state in S-wave\, a deeply bound vector state in P-wave and a narrow reson
ance in D-wave.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributio
ns/2378/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2378/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy and light spectroscopy near the physical point\, Part I: Cha
rm and bottom baryons
DTSTART;VALUE=DATE-TIME:20160725T131500Z
DTEND;VALUE=DATE-TIME:20160725T133500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2382@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Renwick J. Hudspith (York University)\nWe present re
sults of the hadron spectrum using $n_f=2+1$ ensembles with pion masses as
low as 156(4) MeV\, we place particular emphasis on measurements of the s
ingly and doubly heavy charm and bottom baryons.\nUsing the Tsukuba tuning
for relativistic charm and NRQCD for the bottom quarks we perform measure
ments of both light and heavy mesons as well as spin-1/2 and spin-3/2 bary
ons for all possible flavor combinations. Our subsequent analysis yields m
asses with an accuracy below the $1\\%$-level and therefore splittings wit
h good statistical precision. All results are extrapolated to the physical
pion mass via a tightly controlled\, short\, chiral extrapolation.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2382/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2382/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy and light spectroscopy near the physical point\, Part II: Te
traquarks
DTSTART;VALUE=DATE-TIME:20160725T133500Z
DTEND;VALUE=DATE-TIME:20160725T135500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2383@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Anthony Francis (York University)\nHaving introduced
the ensembles and basic spectrum in Part I\, we focus on results for a do
ubly heavy tetraquark candidate\, $qq\\bar Q \\bar Q$. Based on phenomenol
ogical observations regarding heavy baryon systems\, we motivate two possi
ble lattice interpolating operators: a diquark-anti diquark and a meson-me
son. We show these operators exhibit good behaviour both in terms of latti
ce QCD and their phenomenological interpretation. In particular we study t
he $qq\\bar b \\bar b$\, $qq\\bar c \\bar b$ and $qq\\bar c \\bar c$ with
$qq=ud\,us$ flavor combinations and analyze their binding. In the chiral l
imit\, at finite lattice spacing\, we find strong indications for binding
of the $qq=ud$ tetraquark candidates. We comment on possible search window
s for experimental confirmation.\n\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2383/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2383/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Utilising optimised operators and distillation to extract scatteri
ng phase shifts
DTSTART;VALUE=DATE-TIME:20160726T134000Z
DTEND;VALUE=DATE-TIME:20160726T140000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2385@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Antoni Woss (University of Cambridge)\nDistillation
is a method of smearing that allows for the efficient computation of corre
lation functions on the lattice. It vastly reduces the number of operation
s needed to calculate correlation functions with large bases of operators
and all-to-all propagators. In this investigation\, we provide a comprehen
sive comparison of the quality of extracted energy spectra with different
amounts of distillation smearing for the isospin-1 $\\pi\\pi$\, $\\rho$ li
ke channel. Results are demonstrated in the determination of the mass spec
tra and also the scattering phase shift and mass and width of the resonant
$\\rho$ via the Luscher method.\n\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2385/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2385/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the continuum limit with improved Wilson fermions employin
g open boundary conditions. Part 2.
DTSTART;VALUE=DATE-TIME:20160729T155000Z
DTEND;VALUE=DATE-TIME:20160729T161000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2390@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Gunnar Bali (University of Regensburg)\nWe present r
esults obtained by RQCD on various observables\, obtained from simulations
of $N_f=2+1$ flavours of non-perturbatively order-$a$ improved Wilson fer
mions\, employing open boundary conditions in time\, that were created wit
hin the CLS (Coordinated Lattice Simulations) effort. Configurations at fi
ve different values of the lattice spacing\, ranging from 0.086 fm down to
below 0.04 fm exist and many quark mass combinations\, in particular alon
g a line of an (almost) constant sum of quark masses and a constant renorm
alized strange quark mass have been generated. Several key observables\, m
ostly meson and baryon masses have been computed\, and these results will
be presented. In some cases a precise and controlled extrapolation to the
continuum limit has become possible.\n\nhttps://conference.ippp.dur.ac.uk/
event/470/contributions/2390/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2390/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lambda-Nucleon and Sigma-Nucleon interactions from lattice QCD wit
h physical masses
DTSTART;VALUE=DATE-TIME:20160729T140000Z
DTEND;VALUE=DATE-TIME:20160729T142000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2398@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hidekatsu Nemura (Center for Computational Sciences\
, University of Tsukuba)\nWe present our recent study on baryon-baryon (BB
) interactions from\n lattice QCD with almost physical quark masses corres
ponding to\n $(m_\\pi\,m_K)\\approx(146\,525)$ MeV and large volume\n $(La
)^4=(96a)^4\\approx$ (8.2 fm)$^4$. In order to make better use of\n large
scale computer resources\, a large number of BB interactions from\n NN to
$\\Xi\\Xi$ are calculated simultaneously. In this contribution\,\n we focu
s on the strangeness $S=-1$ channels[1] of the hyperon\n interactions by m
eans of HAL QCD method. More recent results will be\n presented which incl
ude $\\Lambda$N$-\\Sigma$N coupled-channel potential\n comprising the tens
or force as well as increasing the Monte Carlo\n samples than shown in the
past[1].\n\n References: \n [1] H. Nemura\, et al.\, arXiv:1604.08346 [h
ep-lat].\n[enter link description here][1]\n\n\n [1]: https://arxiv.org/a
bs/1604.08346\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions
/2398/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2398/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards radiative transitions in charmonium
DTSTART;VALUE=DATE-TIME:20160725T172500Z
DTEND;VALUE=DATE-TIME:20160725T174500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2404@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Cian O'Hara (Trinity College Dublin)\nWe present pre
liminary calculations towards radiative transitions in charmonium using Nf
= 2+1 dynamical ensembles generated by the Hadron Spectrum Collaboration.
A crucial ingredient in this work is the use of variationally optimised i
nterpolating operators which allow for a reliable determination of the thr
ee-point correlation functions needed. Using these operators\, we perform
first calculations of relevant three-point correlation functions before di
scussing future directions"\n\nhttps://conference.ippp.dur.ac.uk/event/470
/contributions/2404/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2404/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon interactions from lattice QCD with physical masses -- Overv
iew and S = 0\, -4 sectors --
DTSTART;VALUE=DATE-TIME:20160729T130000Z
DTEND;VALUE=DATE-TIME:20160729T132000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2426@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Doi Takumi (RIKEN)\nThe lattice QCD determination of
baryon interactions corresponds to connecting a missing link between part
icle physics and nuclear and astrophysics. While previous studies are limi
ted to the calculations with unphysically heavy quark masses\, we are perf
orming the first calculation employing the (almost) physical quark masses
(m(pi) = 146 MeV) on a huge lattice volume of (8fm)^4\, where the interact
ions are extracted from Nambu-Bethe-Salpeter (NBS) correlators by the time
-dependent HAL QCD method. In this talk\, we first give an overview on thi
s project. We then present the latest numerical results for two-nucleon fo
rces (strangeness S = 0) and two-Xi forces (S = -4).\n\nhttps://conference
.ippp.dur.ac.uk/event/470/contributions/2426/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2426/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An $a_0$ resonance in strongly coupled $\\pi \\eta$\, $K \\overlin
e{K}$ scattering from lattice QCD
DTSTART;VALUE=DATE-TIME:20160726T155000Z
DTEND;VALUE=DATE-TIME:20160726T161000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2475@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jozef Dudek (Jefferson Lab)\nWe present the first ca
lculation of coupled-channel meson-meson scattering in the isospin $=1$\,
$G$-parity negative sector\, with channels $\\pi \\eta$\, $K\\overline{K}$
and $\\pi \\eta'$\, in a first-principles approach to QCD. From the discr
ete spectrum of eigenstates in three volumes extracted from lattice QCD co
rrelation functions we determine the energy dependence of the $S$-matrix\,
and find that the $S$-wave features a prominent cusp-like structure in $\
\pi \\eta \\to \\pi \\eta$ close to $K\\overline{K}$ threshold coupled wit
h a rapid turn on of amplitudes leading to the $K\\overline{K}$ final-stat
e. This behavior is traced to an $a_0(980)$-like resonance\, strongly coup
led to both $\\pi \\eta$ and $K\\overline{K}$\, which is identified with a
pole in the complex energy plane\, appearing on only a single unphysical
Riemann sheet. Consideration of $D$-wave scattering suggests a narrow tens
or resonance at higher energy.\n\nhttps://conference.ippp.dur.ac.uk/event/
470/contributions/2475/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2475/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computing the static potential using non-string-like trial states
DTSTART;VALUE=DATE-TIME:20160725T162500Z
DTEND;VALUE=DATE-TIME:20160725T164500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2493@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tobias Neitzel (Goethe University Frankfurt)\nWe pre
sent a method for computing the static quark-antiquark potential\,\nwhich
is not based on Wilson loops\, but where the trial states are\nformed by e
igenvector components of the covariant Laplace operator. We\nhave tested t
his method in SU(2) Yang-Mills theory and obtained results\nwith statistic
al errors of similar magnitude compared to a standard\nWilson loop computa
tion. The runtime of the method is\, however\,\nsignificantly smaller\, wh
en computing the static potential not only for\non-axis\, but also for man
y off-axis quark-antiquark separations\, i.e.\nwhen a fine spatial resolut
ion is required.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributi
ons/2493/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2493/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Testing the hadro-quarkonium model on the lattice
DTSTART;VALUE=DATE-TIME:20160725T164500Z
DTEND;VALUE=DATE-TIME:20160725T170500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2494@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Knechtli (University of Wuppertal)\nRecent
ly the LHCb experiment found evidence for the existence of two\nexotic res
onances consisting of $c\\bar{c}uud$ quarks. Among the possible\ninterpret
ations there is the hadro-charmonium model\, in which charmonium\nis bound
"within" a hadron. We test this idea on CLS $n_f$=2+1 lattices\nusing the
static formulation for the heavy quarks. We find that the\nstatic potenti
al is modified by the presence of a hadron. It becomes\nmore attractive an
d the effect is of the order of few MeV.\n\nhttps://conference.ippp.dur.ac
.uk/event/470/contributions/2494/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2494/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charm-strange mesons and D K scattering
DTSTART;VALUE=DATE-TIME:20160728T142000Z
DTEND;VALUE=DATE-TIME:20160728T144000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2497@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christopher Thomas (University of Cambridge)\nI will
discuss a recent lattice QCD investigation of $D$ $K$ scattering relevant
for near-threshold charm-strange mesons such as the enigmatic $D_s(2317)$
. By employing a range of techniques we extracted precise finite-volume s
pectra in a number of different channels. These were used to map out the
energy dependence of the scattering phase shift and from the singularity s
tructure of the scattering amplitude we determined the resonant and bound
state content. I will conclude with some comments on future prospects.\n\
nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2497/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2497/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Rho Resonance from Twisted Mass Lattice QCD
DTSTART;VALUE=DATE-TIME:20160726T130000Z
DTEND;VALUE=DATE-TIME:20160726T132000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2499@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Markus Werner (University of Bonn)\nWe present new r
esults for $I=1 \\ \\pi\\pi$ scattering with twisted mass fermions utilizi
ng\nthe sLapH method. The breaking of rotational symmetry on the lattice i
s fully taken\ninto account at multiple moving frames. Our previous calcul
ation is\nextended by more single and multi-hadron operators and by utilis
ing more\nirreducible representations.\n\nhttps://conference.ippp.dur.ac.u
k/event/470/contributions/2499/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2499/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD searches for tetraquarks containing charm quarks
DTSTART;VALUE=DATE-TIME:20160725T135500Z
DTEND;VALUE=DATE-TIME:20160725T141500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2514@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Gavin Cheung (University of Cambridge)\nWe present s
earches for tetraquarks in lattice QCD with quark content $cc\\bar{q}\\bar
{q}$ and isospin-1 $c\\bar{c}q\\bar{q}$ which are especially of relevance
to the experimentally observed charged $Z_c$ states. Utilising the variati
onal method\, we employ a large bases of operators consisting of diquark-a
ntidiquark and meson-meson operators. We show the spectra determined acros
s a range of channels. We discuss extending our study to the isospin-0 $c\
\bar{c}q\\bar{q}$ sector.\n\nhttps://conference.ippp.dur.ac.uk/event/470/c
ontributions/2514/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2514/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hindered M1 Radiative Decays
DTSTART;VALUE=DATE-TIME:20160725T170500Z
DTEND;VALUE=DATE-TIME:20160725T172500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2520@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ciaran Hughes (University of Cambridge)\nThroughout
the literature\, phenomenological models have been unsuccessful in pinning
down the heavy quarkonia hindered M1 radiative transitions (i.e.\, those
radiative transitions between states with different principal quantum numb
ers that require one of the quarks to flip-spin) and yield predictions tha
t are spread over a vast range.\n\nIn this talk\, we will learn how to acc
urately and precisely predict these classes of decays by utilising lattice
NRQCD\, compare to the phenomenological calculations\, and then show how
this work is relevant for the experimental hyperfine splitting.\n\nhttps:/
/conference.ippp.dur.ac.uk/event/470/contributions/2520/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2520/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon interactions from lattice QCD with physical masses -- S=-2
sector --
DTSTART;VALUE=DATE-TIME:20160729T134000Z
DTEND;VALUE=DATE-TIME:20160729T140000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2533@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kenji Sasaki (Kyoto University)\nBaryon interactions
are crucial to study a bound and/or resonance state in multi-baryon syste
ms.\nIn spite of their importance\, phenomenological baryon potentials hav
e large uncertainties because of the lack of experimental scattering data.
\nIn recent studies\, the HAL QCD method allow us to extract baryon intera
ctions from the Nambu-Bethe-Salpeter wave functions without using experime
ntal data.\nWe present our latest result on the S = -2 baryon interactions
and discuss the H-dibaryon state using potentials which are calculated by
using the (almost) physical point gauge configurations with large lattice
volume of (8fm)^4 generated on the K-computer.\n\nhttps://conference.ippp
.dur.ac.uk/event/470/contributions/2533/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2533/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Using a new analysis method to extract excited states in the scala
r meson sector
DTSTART;VALUE=DATE-TIME:20160725T160500Z
DTEND;VALUE=DATE-TIME:20160725T162500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2563@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jacob Finkenrath (german)\nWe present an alternative
method to the Generalized Eigenvalue Problem (GEVP) for extracting excite
d states.\nThe method is based on statistically sampling the space of poss
ible set of parameters according to the $\\chi^2$-value of each set of val
ues.\nThis method is particularly suited when one has noisy data as is the
case for some correlators at large times\nsuch as in the scalar light qqb
ar channel. We will apply this method to the analysis of the $J^P = 0^+$ c
hannels used in the search for \nthe $a_0$ particle and compare the result
s to the standard GEVP approach\, pointing out\nadvantages and disadvantag
es of the method compare to the GEVP approach.\n\nhttps://conference.ippp.
dur.ac.uk/event/470/contributions/2563/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2563/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scaling and properties of 1/a = 1 GeV\, 2+1 flavor Mobius Domain W
all Fermion ensembles
DTSTART;VALUE=DATE-TIME:20160729T161000Z
DTEND;VALUE=DATE-TIME:20160729T163000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2578@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Robert Mawhinney (Columbia University)\nThe RBC and
UKQCD Collaborations have used 2+1 flavor\nDomain Wall Fermion ensembles\,
generated with the Iwasaki gauge\naction plus the Dislocation Suppressing
Determinant Ratio (DSDR)\,\nfor a variety of calculations\, including our
ongoing G-parity\ncalculation of $K \\to \\pi \\pi$ matrix elements. The
se calculations\nhave been done with 1/a = 1.35 GeV. With the HotQCD Coll
aboration\,\nzero and finite temperature ensembles at even coarser lattice
\nspacings\, 1/a = 1 GeV\, have been produced. These coarse\, zero\ntempe
rature ensembles have been included in global fits for light\nhadronic obs
ervables and show scaling errors of a few percent for\nthem. Large physic
al volume ensembles at 1/a = 1 GeV\nare being generated for a variety of m
easurements and our ongoing\ninvestigation of their properties will be pre
sented.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2578/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2578/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectroscopy of charmed mesons from lattice QCD
DTSTART;VALUE=DATE-TIME:20160728T132000Z
DTEND;VALUE=DATE-TIME:20160728T134000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2582@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: David Tims (Trinity College Dublin)\nCharmed meson s
pectroscopy with data generated by the Hadron Spectrum\nCollaboration is p
resented\, using two ensembles with different light\nsea-quark masses to i
nvestigate the effect of the sea quark mass on the\nspectrum. Initial resu
lts from an investigation of the contribution of\nthe disconnected quark-l
ine diagram on the charmonium hyperfine\nsplitting will be presented\, inc
luding a comparison with quenched data.\n\nhttps://conference.ippp.dur.ac.
uk/event/470/contributions/2582/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2582/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Angular and chiral content of the $\\rho$ and $\\rho^\\prime$ meso
ns
DTSTART;VALUE=DATE-TIME:20160726T140000Z
DTEND;VALUE=DATE-TIME:20160726T142000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2591@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christian Rohrhofer (University of Graz)\nWe identif
y the chiral and angular momentum content of the \nleading quark-antiquark
Fock component for the $\\rho(770)$ and\n$\\rho(1450)$ mesons using a two
-flavor lattice simulation with dynamical\nOverlap Dirac fermions. We extr
act this information from the overlap factors \nof two interpolating fiel
ds with different chiral structure and from the unitary transformation\nb
etween chiral and angular momentum basis. For the chiral content of the me
sons\nwe find that\nthe $\\rho(770)$ slightly favors the $(1\,0)\\oplus(0\
,1)$ chiral representation\nand the $\\rho(1450)$ slightly favors the $(1/
2\,1/2)_b$ chiral\nrepresentation. In the angular momentum basis the $\\rh
o(770)$ is then a $^3S_1$\nstate\, in accordance with the quark model. The
$\\rho(1450)$ is a $^3D_1$ state\, \nshowing that the quark model wrongly
assumes the $\\rho(1450)$ to be a \nradial excitation of the $\\rho(770)$
.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2591/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2591/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Properties of non-local wave function equivalent potential with ge
neralized derivative expansion
DTSTART;VALUE=DATE-TIME:20160728T163000Z
DTEND;VALUE=DATE-TIME:20160728T165000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2601@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takuya Sugiura (RCNP\, Osaka University)\nHAL QCD co
llaboration has mostly considered the lowest order potential\nof the deriv
ative expansion so far based on the assumption that higher\norder terms yi
eld minor correction in low energy region.\nIn this study\, we aim at inve
stigating the properties of HAL QCD's non-local\npotentials when the deriv
ative expansion is explicitly performed to higher order.\nWe report the re
sult of our model calculation in a 1+1 dimensional coupled-channel\nsystem
. \nWe introduce a generalized version of the derivative expansion and sho
w\nthat the potential reproduces scattering phase shift quite well.\nThe g
eneralized expansion has some favorable features which is also applicable\
nto the actual lattice QCD calculations.\nThe possibility of improving the
convergence of the expansion is\nalso discussed in this framework.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2601/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2601/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Searching for evidence of diquark states using lattice QCD simulat
ions
DTSTART;VALUE=DATE-TIME:20160725T145500Z
DTEND;VALUE=DATE-TIME:20160725T151500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2603@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ryutaro Fukuda (University of Tokyo\, RIKEN BNL Rese
arch Center)\nIn recent years\, exotic hadrons called X\, Y\, Z\nwhich can
not be explained by the quark model have been found one after another.\nFo
r example\, the tetraquark state\, which is one of the typical scenarios t
o interpret the exotic state\, is based on the existence of a diquark stat
e.\nThe discovery of a pentaquark state at CERN in July last year\nalso ma
kes a diquark state even more important.\nIt is well known that an attract
ion between two quarks\ncan be enhanced in the color anti-triplet\, flavor
anti-symmetric\,\nspin singlet\, positive parity channel and this diquark
is called good diquark.\nOur main subject is to check\nif a lattice QCD s
imulation with 2 flavor Wilson fermions actually supports this statement.\
nFor this objective\,\nwe calculate diquark mass diference between good di
quark and other diquarks\nand also analyze density distribution of diquark
s\nthrough calculation of density-density correlators.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/470/contributions/2603/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2603/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An application of stochastic LapH method to Hadron interaction in
lattice QCD
DTSTART;VALUE=DATE-TIME:20160728T171000Z
DTEND;VALUE=DATE-TIME:20160728T173000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2614@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daisuke KAWAI (Kyoto University)\nThe first principl
e calculation of hadron-hadron interaction is an important step toward the
understanding of nuclear physics from QCD. The HAL QCD method is largely
contributing to this purpose by making it possible to calculate nuclear po
tentials in lattice QCD. We now try to extend the HAL QCD method to system
s such as $\\pi-\\pi$ and $\\pi-N$\, where pair creation and annihilation
of quarks become possible\, employing the stochastic LapH smearing. In t
his talk\, we explain our methodology and report the current status on the
application to two meson interactions.\n\nhttps://conference.ippp.dur.ac.
uk/event/470/contributions/2614/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2614/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Two-flavor simulations of the rho(770) and the role of the KKbar c
hannel
DTSTART;VALUE=DATE-TIME:20160726T132000Z
DTEND;VALUE=DATE-TIME:20160726T134000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2615@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bin Hu (Department of Physics\, The George Washingto
n University)\nThe $\\rho (770)$ meson is the most extensively studied res
onance in lattice QCD\nsimulations in two ($N_f=2$) and three ($N_f=2+1$)
flavors. We\nanalyze all available phase shifts from $N_f=2$ simulations u
sing unitarized Chiral Perturbation\nTheory\, allowing not only for the ex
trapolation in mass but also in flavor\,\n$N_f=2\\rightarrow N_f=3$. The f
lavor extrapolation requires information from a global\nfit to $\\pi\\pi$
and $\\pi K$ phase shifts from experiment. The $K\\bar K$ channel\nhas a s
ignificant effect and leads to $\\rho(770)$ masses surprisingly close to t
he\nexperimental one. Chiral extrapolations of $N_f=2+1$ simulations are a
lso presented.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribution
s/2615/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2615/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The coupled channel approach to the Lambda_c N - Sigma_c N system
in lattice QCD
DTSTART;VALUE=DATE-TIME:20160728T165000Z
DTEND;VALUE=DATE-TIME:20160728T171000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2631@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takaya for HAL QCD Collaboration Miyamoto (Yukawa In
stitute for Theoretical Physics\, Kyoto University)\nWe investigate the 2-
baryon system with the isospin 1/2 \nincluding one charm quark\, namely\,
$\\Lambda_c N$ and $\\Sigma_c N$.\nAlthough this system is similar to the
$\\Lambda N$ and $\\Sigma N$ system\,\nthe interaction of this charmed 2-b
aryon system above $\\Sigma_c N$ threshold \nmight be quite different from
its hyperon counter part\, due to the smaller mass splitting \nbetween $\
\Sigma_c$ and $\\Sigma_c^*$ than $\\Sigma$ and $\\Sigma^*$\, \nwhich is co
nsequence of the heavy quark spin symmetry. \nTo explore this possibility\
, we calculate the coupled channel potential \nfor charmed 2-baryon system
using the HAL QCD method in lattice QCD. \nTo avoid the discretization er
ror coming from the heavy quark mass\, we employ \nthe Relativistic Heavy
Quark (RHQ) action for the charm quark. \nThe purpose of this talk is to p
resent our latest results and to discuss\nthe nature of the interaction in
the charmed 2-baryon system including \na possibility on the existence of
bound or resonance states.\n\nhttps://conference.ippp.dur.ac.uk/event/470
/contributions/2631/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2631/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon interactions from lattice QCD with physical masses -- S=-3
sector: XiSigma & XiLambda-XiSigma --
DTSTART;VALUE=DATE-TIME:20160729T132000Z
DTEND;VALUE=DATE-TIME:20160729T134000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2636@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Noriyoshi Ishii (Research Center for Nuclear Physics
(RCNP)\, Osaka University)\nNucleon-Nucleon interaction plays an ess
ential role in nuclear\nphysics. In the same way\, hyperon-hyperon int
eractions should play an\nimportant role in hyper nuclear physics. Howeve
r\, unlike the nucleons\nwhich are quite stable\, hyperons decay quickl
y so that the direct\nscattering experiments are difficult. As a resu
lt\, phenomenological\ndetermination of hyperon potentials involves larg
e uncertainly. In\nthis talk\, by using the gauge configurations at the
(almost) physical\npoint (m(pi)=146 MeV) on a huge spatial lattice (8fm
)^4\, we present\nour latest result on the hyperon-hyperon potentials f
or S=-3 sector\n(XiSigma & XiSigma-XiLambda) from the Nambu-Bethe-S
alpeter wave\nfunctions based on the HAL QCD method.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2636/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2636/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charm physics by $N_f=2+1$ Iwasaki gauge and the six stout smeared
$O(a)$-improved Wilson quark actions on a $96^4$ lattice
DTSTART;VALUE=DATE-TIME:20160728T130000Z
DTEND;VALUE=DATE-TIME:20160728T132000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2652@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yusuke Namekawa (University of Tsukuba)\nWe present
our results of charm physics in\n$N_f=2+1$ lattice QCD. Our calculation is
\nperformed on configurations generated\nwith Iwasaki gauge and the six st
out smeared\n$O(a)$-improved Wilson quark actions on a $96^4$ lattice\nat
$\\beta=1.82$ ($a^{-1} = 2.3$ GeV) with the spatial\nextent $L=8.1$ fm. Th
e pion mass is almost physical\n$m_\\pi=145$~MeV. The relativistic heavy q
uark action\nis utilized for the charm quark.\nWe exhibit the charmed spec
trum and the charm\nquark mass\, focusing on stout smearing influence.\n\n
https://conference.ippp.dur.ac.uk/event/470/contributions/2652/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2652/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Near threshold states $D_{s0}^{*}\\left(2317\\right)$ and $D_{s1}\
\left(2460\\right)$
DTSTART;VALUE=DATE-TIME:20160728T144000Z
DTEND;VALUE=DATE-TIME:20160728T150000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2653@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Antonio Cox (University of Regensburg)\nEarly theore
tical studies and lattice simulations predicted the charmed-strange mesons
$D_{s0}^{*}(2317)$ and $D_{s1}(2460)$ to be broad states lying above the
thresholds\, $DK$ and $D^{*}K$\, respectively. Experiments found narrow st
ates below threshold. We present results of a high statistics $Nf=2$ study
with a lattice spacing of approximately $0.071$ fm\, taking explicitly in
to account the thresholds by including four quark operators. We find a low
ering of the meson’s masses relative to the two-quark operator results.
Two pion masses with multiple volumes were employed\, $Lm_{\\pi}=2.5\,3.4\
,4.2$ and $6.7$ at $m_{\\pi}=289$ MeV and $Lm_{\\pi}=2.8$ and $3.5$ at $m_
{\\pi}=150$ MeV. The volume dependence of the resulting spectrum is invest
igated according to Luescher’s formula.\n\nhttps://conference.ippp.dur.a
c.uk/event/470/contributions/2653/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2653/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Glueball spectrum from $N_f=2$ lattice QCD study on anisotropic la
ttices
DTSTART;VALUE=DATE-TIME:20160726T165000Z
DTEND;VALUE=DATE-TIME:20160726T171000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2654@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ying Chen (Institute of High Energy Physics\, CAS)\n
The glueball spectrum is investigated through a $N_f=2$ lattice QCD study.
The gauge\nconfigurations are generated with two degenerate flavors of qu
arks on anisotropic lattices. At two pion masses\, say\, $m_\\pi=580$ MeV
and $920$ MeV\, we obtain the masses of the scalar\, the tensor glueballs\
, which are in agreement with the results from the previous quenched and u
nquenched lattice QCD studies. For the pseudoscalar channel\, we can get a
state of mass roughly 2.4-2.5 GeV by the use of the gluonic lattice opera
tors whose continuum counterparts are $\\epsilon_{ijk}B_i^a(D_j B_k)^a$. T
his state is compatible with the pseudoscalar glueball from the previous q
uenched lattice QCD studies. We do not observe a clear quark mass dependen
ce of the masses of these states. We also calculate the correlation functi
ons of the topological charge density adopting the gradiant flow smearing
scheme. We can seemingly observe a state with a mass around 1 GeV\, but fa
il to obtain a definite result owing to our coarse and small lattices. Thi
s state might be the isoscalar $q\\bar{q}$ pseudoscalar meson\, the $SU(2)
$ counterpart of the $SU(3)$\nflavor singlet $\\eta'$.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/470/contributions/2654/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2654/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Impact of dynamical charm quarks
DTSTART;VALUE=DATE-TIME:20160728T134000Z
DTEND;VALUE=DATE-TIME:20160728T140000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2655@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tomasz Korzec (Bergische Universität Wuppertal)\nWe
investigate the influence of dynamical charm quarks on various observable
s. For observables without explicit charm-quark dependence\, decoupling ap
plies and the effects are expected to be small. However\, we also study qu
antities with explicit charm-quark dependence\, like the charmonium mass s
pectrum\, where decoupling does not apply. \n\nOur study puts an emphasis
on careful continuum extrapolations\, which require very small lattice spa
cings when heavy quarks are present in the action. Since our precision goa
ls cannot be currently met in full QCD\, we carry our investigations out i
n a model without light quarks\; quenched QCD is compared to QCD with two
dynamical heavy quarks.\n\nhttps://conference.ippp.dur.ac.uk/event/470/con
tributions/2655/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2655/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luescher's finite volume test for two-baryon systems with attracti
ve interactions
DTSTART;VALUE=DATE-TIME:20160728T155000Z
DTEND;VALUE=DATE-TIME:20160728T161000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2671@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sinya Aoki (Yukawa Institute for Theoretical Physics
\, Kyoto University)\nSince the energy shift of two-baryon system due to t
he finite volume is negative for the attractive interaction\, the Lueshcer
's finite volume formula gives the phase shift at negative squared momentu
m\, $k^2 0$ to a real but negative $k^2$ in the infinite volume.\n\nIn th
is talk\, using the Lueshcer's finite volume formula for the phase shift\,
we reexamine behaviors of the phase shifts at $k^2\n\nhttps://conference.
ippp.dur.ac.uk/event/470/contributions/2671/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2671/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon interactions in lattice QCD: the direct method vs. the HAL
QCD potential method
DTSTART;VALUE=DATE-TIME:20160728T153000Z
DTEND;VALUE=DATE-TIME:20160728T155000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2674@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takumi Iritani (Stony Brook University)\nIn lattice
QCD\, both direct method for eigen-energy extraction and HAL QCD method f
or potential are employed so far to study hadron interactions. The scatte
ring phase shifts\, for example\, are obtained through the Luscher’s fin
ite volume formula for the former\,\nbut they are calculated via the Schro
edinger equation with the potential in the infinite volume for the latter.
\nAlthough both methods should agree in principle\, some systematically di
fferent conclusions are reported for existences of bound states in the pre
vious studies: while the potential shows no sign of the bound state in tw
o nucleon systems at heavier pion masses\, for example\, the eigen-energy
indicates its existence.\n\nIn this work\, we clarify that these discrepan
cies come from a failure of the eigen-energy extraction for the ground sta
te due to the contamination of excited states in time correlation function
s\, while the HAL QCD potential method is free from this problem.\nWe fin
ally establish consistencies between two lattice QCD approaches\, and prop
ose an improved extraction of eigen-energy for the time correlation functi
ons using energy eigen-functions obtained from the HAL QCD potential.\n\nh
ttps://conference.ippp.dur.ac.uk/event/470/contributions/2674/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2674/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Systematic study of operator dependence in nucleus calculation at
large quark mass
DTSTART;VALUE=DATE-TIME:20160728T161000Z
DTEND;VALUE=DATE-TIME:20160728T163000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2675@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takeshi Yamazaki (Univ. of Tsukuba)\nRecently it was
raised a possibility that calculation of the nucleus correlation function
s suffers from a significant systematic error due to excited state contrib
utions depending on the choice of the source operator.\nIn order to invest
igate the operator dependence of the nucleus correlation functions\,\nwe h
ave performed a high precision calculation employing the exponential smear
ed and \nwall operators at 0.7 GeV pion mass in 2+1 flavor QCD\, and 0.8 G
eV pion mass \nin quenched QCD.\nWe present preliminary results and discus
s the systematic errors caused by the choice of the source operator.\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2675/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2675/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Importance of closed quark loops for lattice QCD studies of tetraq
uarks
DTSTART;VALUE=DATE-TIME:20160725T154500Z
DTEND;VALUE=DATE-TIME:20160725T160500Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2688@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Joshua Berlin (University of Frankfurt)\nTo investig
ate the light scalar tetraquark candidate $a_0(980)$ (quantum numbers $J^P
=0^+$)\, a correlation matrix including a variety of two- and four-quark i
nterpolating operators has to be computed. We discuss efficient techniques
to compute the elements of this correlation matrix. In particular we pres
ent numerical results for diagrams with closed quark loops and present evi
dence that such diagrams are not negligible\, i.e. that their contribution
is essential to obtain physically meaningful results.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/470/contributions/2688/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2688/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The isospin-0 pion-pion scattering length from twisted mass lattic
e QCD
DTSTART;VALUE=DATE-TIME:20160726T161000Z
DTEND;VALUE=DATE-TIME:20160726T163000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2689@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Liuming Liu (University of Bonn)\nWe present results
for the $\\pi\\pi$ isospin-0 scattering length calculated in twisted mass
lattice\nQCD. We use a set of $N_f = 2 + 1 + 1$ ensembles with pion mass
\nvarying in the range of 230MeV - 510MeV at three different values of lat
tice spacing and two\n$N_f=2$ ensembles with one pion mass at its physical
value and one at 250MeV. \nThe quark disconnected diagrams are computed w
ith sufficient precision by using the stochastic\nLaplacian Heaviside quar
k smearing method. For the first time we extrapolate our lattice results t
o\nthe physical pion mass and continuum limit.\n\nhttps://conference.ippp.
dur.ac.uk/event/470/contributions/2689/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2689/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Approaching the bottom using fine lattices with Domain-wall fermio
ns.
DTSTART;VALUE=DATE-TIME:20160729T142000Z
DTEND;VALUE=DATE-TIME:20160729T144000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2697@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Brendan Fahy (KEK)\nWe explore the properties of hea
vy-light psuedoscalar mesons above the\ncharm mass sing Mobius domain-wall
fermions on fine lattices at a~0.080\,\n0.055\, and 0.044 fm. We examine
masses and decay constants using a\nseries of heavy quark masses up to 3 t
imes the charm quark. We attempt\nto analyze the cutoff effects for heavy
quarks above the charm and\naccount for the low order effects using ideas
from HQET. Using these\nresults we extrapolate to B-physics and report pre
liminary results for\nM_B(s) and F_B(s).\n\nhttps://conference.ippp.dur.ac
.uk/event/470/contributions/2697/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2697/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmed-bottom mesons from Lattice QCD
DTSTART;VALUE=DATE-TIME:20160729T144000Z
DTEND;VALUE=DATE-TIME:20160729T150000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2701@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nilmani Mathur (Tata Institute of Fundamental Resear
ch)\nWe present ground state spectra of mesons containing a charm and a\nb
ottom quark. For the charm quark we use overlap valence quarks while a\nno
n-relativistic formulation is utilized for the bottom quark on a\nbackgrou
nd of 2+1+1 flavor HISQ gauge configurations generated by the\nMILC collab
oration. We also study the ratio of leptonic decay\nconstants\, $f_{B_c^*}
/f_{B_c}$. Results are obtained at three lattice spacings.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2701/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2701/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice operators for scattering of particles with spin
DTSTART;VALUE=DATE-TIME:20160726T163000Z
DTEND;VALUE=DATE-TIME:20160726T165000Z
DTSTAMP;VALUE=DATE-TIME:20211016T112709Z
UID:indico-contribution-504-2719@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sasa Prelovsek (University of Ljubljana)\nThe operat
ors for simulating the scattering of two hadrons with spin will be present
ed. Three methods give consistent operators for PN\, PV\, VN and NN scatte
ring\, where P\, V and N denote pseudoscalar\, vector and nucleon. Explici
t expressions for all irreducible representations and few lowest momenta w
ill be shown as an example. Correct transformation properties will be demo
nstrated.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/271
9/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2719/
END:VEVENT
END:VCALENDAR