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VERSION:2.0
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BEGIN:VEVENT
SUMMARY:Conformal window of SU(2) model with fundamental fermions
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-317@cern.ch
DESCRIPTION:Speakers: Mr. LEINO\, Viljami (University of Helsinki)\nWe pre
sent updated results of the infrared behavior of the SU(2) model with 6 an
d 8 fundamental representation fermions. We use the gradient flow method w
ith the Schrödinger functional boundary conditions to measure the running
of the coupling in these theories and find fixed points on both. We also
measure the mass anomalous dimension from these configurations and compare
those results to mass anomalous dimension measurements from the mass spec
trum simulations.\n\nhttps://makondo.ugr.es/event/0/session/24/contributio
n/317
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/317
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological susceptibility with a single light quark flavour
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-275@cern.ch
DESCRIPTION:Speakers: Dr. FRISON\, Julien (KEK Theory Center)\nOne of the
historical suggestions to tackle the strong CP problem is to take the up q
uark mass to zero while keeping $m_d$ finite. The $\\theta$ angle is then
supposed to become irrelevant\, i.e. the topological susceptibility vanish
es. However\, the definition of the quark mass is scheme-dependent and ide
ntifying the $m_u=0$ point is not trivial\, in particular with Wilson-like
fermions. More specifically\, up to our knowledge there is no theoretical
argument guaranteeing that the topological susceptibility exactly vanishe
s when the PCAC mass does. \n\nWe will present our recent progresses on th
e empirical check of this property using $N_f=1+2$ flavours of clover ferm
ions\, where the lightest fermion is tuned very close to $m_u^{PCAC}=0$ an
d the mass of other two is kept of the order of magnitude of the physical
$m_s$. This choice is indeed expected to amplify any undesirable non-pertu
rbative effect caused by $m_u\\not=m_d$. The simulation is repeated for se
veral $\\beta$s and those results\, although preliminary\, give a hint abo
ut what happens in the continuum limit.\n\nhttps://makondo.ugr.es/event/0/
session/24/contribution/275
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/275
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice calculation of hadronic tensor of the nucleon
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-250@cern.ch
DESCRIPTION:Speakers: Prof. KEH-FEI\, Liu (University of Kentucky)\nWe com
pute the hadronic tensor $W_{\\mu\\nu}$ in the Euclidean space by calculat
ing 4-point correlation functions on the lattice\, two topologically disti
nct connected insertons are considered which help to separate the connecte
d sea parton contribution from that of the disconnected sea. We try to con
vert the Euclidean hadronic tensor to Minkowski space through inverse Lapl
ace transform. As an exploratory study\, we use a $12^3\\times128$ anisotr
opic lattice with $a_s\\sim 0.18$ fm and $m_{\\pi}\\sim$ 640 MeV for a ran
ge of $Q^2$ and $x$.\n\nhttps://makondo.ugr.es/event/0/session/24/contribu
tion/250
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/250
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extended investigation of the 12 flavor beta function
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-405@cern.ch
DESCRIPTION:Speakers: Prof. FODOR\, Zoltan (University of Wuppertal)\nWe r
eport on continued studies of the non-perturbative beta function in SU(3)
gauge theory with 12 fundamental massless flavors\, a model which remains
controversial as to the existence of an infrared fixed point. We extend ou
r previous work (Phys. Rev. D94 (2016) no.9\, 091501) to stronger gauge co
uplings and test conformality for this model.\n\nhttps://makondo.ugr.es/ev
ent/0/session/24/contribution/405
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/405
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scaling properties of fully-twisted quarks on a non-perturbatively
$O(a)$ improved Wilson sea.
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-288@cern.ch
DESCRIPTION:Speakers: Mr. UGARRIO MUÑOZ\, Javier (Instituto Física Teór
ica UAM-CSIC)\nWe study the scaling of observables computed with an $N_f=2
+1+1$ fully-twisted tmQCD valence action on $N_f=2+1$ CLS ensembles. Parti
cular attention is given to relative cutoff effects in basic quantities su
ch as quark and meson masses and decay constants\, as well as to isospin s
plitting of pseudoscalar mesons.\n\nhttps://makondo.ugr.es/event/0/session
/24/contribution/288
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/288
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alternatives to the stochastic "noise vector" approach
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-346@cern.ch
DESCRIPTION:Speakers: Mr. DE FORCRAND\, Philippe (ETH Zurich)\nSeveral imp
ortant observables\, like the quark condensate and\nthe Taylor coefficient
s of the QCD pressure with respect to the\nchemical potential\, are based
on the trace of the inverse Dirac\noperator or its powers.\nSuch traces ar
e traditionally estimated with "noise vectors".\nWe explore alternative ap
proaches based on polynomial approximations\nof the inverse Dirac operator
.\n\nhttps://makondo.ugr.es/event/0/session/24/contribution/346
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/346
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computation of the entropy of SU(3) Yang-Mills theory using shifte
d boundary conditions
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-328@cern.ch
DESCRIPTION:Speakers: Mr. LAUBACH\, Dominik (University of Wuppertal)\nWe
calculate the entropy of SU(3) Yang-Mills theory in a moving frame using t
he Symanzik improved action. By using shifted boundary conditions a moving
frame can be realized on the lattice. In this setting the momentum densit
y and the renormalization constant of the offdiagonal elements of the ener
gy-momentum tensor are computed. The results are then used to compute the
entropy density.\n\nhttps://makondo.ugr.es/event/0/session/24/contribution
/328
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/328
END:VEVENT
BEGIN:VEVENT
SUMMARY:An implementation of the DD-$\\alpha$AMG multigrid solver on Intel
Knights Landing
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-329@cern.ch
DESCRIPTION:Speakers: Mr. RICHTMANN\, Daniel (University of Regensburg)\nW
e describe our experiences porting the Regensburg implementation of the\nD
D-$\\alpha$AMG solver from the first-generation Intel Xeon Phi processor\n
(Knights Corner) to its successor (Knights Landing). We present the\nperfo
rmance of the code on a single processor as well as the scaling\nbehavior
on many nodes of QPACE 3\, which utilizes Intel's new Omni-Path\nfabric.\n
\nhttps://makondo.ugr.es/event/0/session/24/contribution/329
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/329
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multi-grid Lanczos
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-363@cern.ch
DESCRIPTION:Speakers: LEHNER\, Christoph (BNL)\nI present a multi-grid Lan
czos algorithm that reduces the memory requirements both on disk and in wo
rking memory by one order of magnitude for RBC/UKQCD's 48I and 64I ensembl
es at the physical pion mass. The precision of the resulting eigenvectors
is on par with exact deflation.\n\nhttps://makondo.ugr.es/event/0/session
/24/contribution/363
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/363
END:VEVENT
BEGIN:VEVENT
SUMMARY:$b\\bar b u\\bar d$ four-quark systems in the Born-Oppenheimer app
roximation: prospects and challenges
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-286@cern.ch
DESCRIPTION:Speakers: Ms. PETERS\, Antje (Goethe-Universität Frankfurt am
Main)\nWe summarize previous work on $\\bar b \\bar b u d$ four-quark sys
tems in the\nBorn-Oppenheimer approximation and discuss first steps toward
s an extension\nto the theoretically more challenging $b \\bar b u \\bar d
$ system.\nStrategies to identify a possibly existing $b \\bar b u \\bar d
$ bound state\nare discussed und first numerical results are presented.\n\
nhttps://makondo.ugr.es/event/0/session/24/contribution/286
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/286
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics near the first order phase transition of SU(3) gaug
e theory using gradient flow
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-303@cern.ch
DESCRIPTION:Speakers: Dr. EJIRI\, Shinji (Niigata University)\nWe study th
e gaps between thermodynamic quantities in the hot and cold phases of the
SU(3) gauge theory at the first order phase transition point.\nPerforming
simulations on lattices with various spatial volume and lattice spacing\,
we calculate the energy gap (latent heat) by a method using the Yang-Mills
gradient flow and compare it with that by the conventional derivative met
hod.\n\nhttps://makondo.ugr.es/event/0/session/24/contribution/303
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/303
END:VEVENT
BEGIN:VEVENT
SUMMARY:New methods for B decay constants and form factors from Lattice NR
QCD
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-330@cern.ch
DESCRIPTION:Speakers: Prof. DAVIES\, Christine (University of Glasgow)\nI
will provide an update on HPQCD second-generation B-physics calculations u
sing improved NRQCD b quarks and HISQ light quarks on the MILC\nn_f=2+1+1
gauge configurations. The configurations include the effect of HISQ sea qu
arks with a range of light quark masses going down \nto the physical point
for a range of lattice spacing values. \nResults include B and Bs mixing
matrix elements and tests of a new approach to B decay constants and semil
eptonic form factors.\n\nhttps://makondo.ugr.es/event/0/session/24/contrib
ution/330
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/330
END:VEVENT
BEGIN:VEVENT
SUMMARY:Update on $\\varepsilon_K$ with lattice QCD inputs
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-263@cern.ch
DESCRIPTION:Speakers: Prof. LEE\, Weonjong (Seoul National University)\nWe
present recent results of the indirect CP violation parameter in\nthe neu
tral kaon system\, $\\varepsilon_K$ calculated using lattice QCD\ninputs i
ncluding $\\hat{B}_K$\, $\\xi_0$\, $\\xi_2$\, $V_{us}$\, $V_{cb}$\,\nand $
m_c(m_c)$.\n\nhttps://makondo.ugr.es/event/0/session/24/contribution/263
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/263
END:VEVENT
BEGIN:VEVENT
SUMMARY:Approaching QUDA 1.0
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-389@cern.ch
DESCRIPTION:Speakers: Dr. WAGNER\, Mathias (NVIDIA)\nThe QUDA library for
Lattice QCD on NVIDIA GPUs will be around for 10 years in 2018. In this ti
me QUDA has developed from an acceleration library for solvers to a framew
ork for developing QCD simulations. It support many different fermion disc
retizations\, and features many algorithms like Adaptive Multigrid\, defla
tion and Block Krylov space methods\, using various techniques such as mix
ed-precision and communication hiding to maximise performance. We will pre
sent a current state of QUDA\, discuss performance on current hardware and
present a roadmap to QUDA 1.0. We also encourage discussions about user
requests.\n\nhttps://makondo.ugr.es/event/0/session/24/contribution/389
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/389
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical experiments using deflation with the HISQ action
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-273@cern.ch
DESCRIPTION:Speakers: Dr. MCNEILE\, Craig (Plymouth University)\nThe use o
f deflation is a common technique to speed up the calculation of quark pro
pagators for Wilson/clover or domain wall fermions. I report on numerical
experiments using deflation to compute quark propagators for the HISQ impr
oved staggered action. The method is tested on HISQ gauge configurations\,
generated by the MILC collaboration\,\nwith lattice spacings of 0.15 fm\,
with a range of volumes\, and quark masses down to the physical quark mas
s. I present preliminary results on using these methods for disconnected d
iagrams.\n\nhttps://makondo.ugr.es/event/0/session/24/contribution/273
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/273
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards leading isospin breaking effects in mesonic masses with $O
(a)$ improved Wilson fermions
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-294@cern.ch
DESCRIPTION:Speakers: RISCH\, Andreas (University of Mainz)\nWe present an
exploratory study of leading isospin breaking effects in mesonic masses u
sing $O(a)$ improved Wilson fermions. Isospin symmetry is explicitly broke
n by distinct masses and electric charges of the up and down quarks. In or
der to be able to make use of existing isosymmetric QCD gauge ensembles we
apply reweighting techniques. The path integral describing QCD+QED is exp
anded perturbatively in powers of the light quarks' mass deviations and th
e electromagnetic coupling. We employ QED$_L$ as a finite volume formulati
on of QED.\n\nhttps://makondo.ugr.es/event/0/session/24/contribution/294
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/294
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charge-density-wave phases of one-dimensional model with long-rang
e repulsive interactions
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-408@cern.ch
DESCRIPTION:Speakers: Dr. SZYNISZEWSKI\, Marcin (Lancaster University)\nTh
e one-dimensional extended t-V model on a lattice describes fermions with
repulsive interactions of finite range and exhibits a quantum phase transi
tion between a Luttinger liquid conducting phase and a Mott insulating pha
se. Its properties make it useful in the description of candidate material
s for Mott transistor devices. It is known that by tailoring the potential
energy of the insulating system\, one can force a phase transition into a
different insulating phase [1\, 2]. We show how to construct all possible
charge-density-wave phases of the system at low critical densities in the
atomic limit. Higher critical densities are investigated by a brute-force
analysis of the possible finite unit cells of the Fock states. We present
example phase diagrams of the system.\n\nWe construct a matrix product op
erator representation of the Hamiltonian of the t-V model. Using the matri
x product states (MPS) approach we go beyond the atomic limit\, where the
phase diagrams are much richer. MPS method is especially problematic near
the transition between two different charge-density-wave phases and we sho
w how the bond dimension must be increased in order to converge the result
s.\n\nOur results indicate that the number of possible insulating phases g
rows with both the maximum interaction range and the fermion density and m
ay cause the loss of insulating properties of the material at finite tempe
ratures.\n\n----------\n\n**References**\n\n 1. P. Schmitteckert and R. We
rner\, Phys. Rev. B\, 69\, 195115 (2004).\n\n 2. T. Mishra\, J. Carrasquil
la\, and M. Rigol\, Phys. Rev. B\, 84\, 115135 (2011).\n\nhttps://makondo.
ugr.es/event/0/session/24/contribution/408
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/408
END:VEVENT
BEGIN:VEVENT
SUMMARY:Order parameters and color-flavor center symmetry in QCD
DTSTART;VALUE=DATE-TIME:20170620T183000Z
DTEND;VALUE=DATE-TIME:20170620T193000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-1-470@cern.ch
DESCRIPTION:Speakers: Mr. CHERMAN\, Aleksey (University of Washington)\nCo
mmon lore suggests that no well-defined order parameters exist in $N$-colo
r QCD with massive quarks which are non-trivial at zero baryon density. Ho
wever\, such order parameters do exist when there are $n_f$ quark flavors
with a common mass and $d\\equiv{\\rm gcd}(n_f\,N) > 1$. Such theories hav
e $Z_d$ color-flavor center symmetry arising from intertwined color center
transformations and cyclic flavor permutations. The realization of this s
ymmetry changes depending on the values of the temperature\, baryon chemic
al potential\, and $n_f/N$\, with implications for conformal window studie
s and dense quark matter.\n\nhttps://makondo.ugr.es/event/0/session/24/con
tribution/470
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/470
END:VEVENT
BEGIN:VEVENT
SUMMARY:An update on the BQCD Hybrid Monte Carlo program
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-216@cern.ch
DESCRIPTION:Speakers: STÜBEN\, Hinnerk (Universität Hamburg)\nWe present
an update of BQCD\, our Hybrid-Monte-Carlo program for\nsimulating lattic
e QCD. BQCD is one of the main production codes of the\nQCDSF collaborati
on and is used by CSSM and in some Japanese finite\ntemperature and finite
density projects. Since the first publication of\nthe code at Lattice 20
10 the program has been extended in various ways.\nNew features of the cod
e include: dynamical QED\, action modification in\norder to compute matrix
elements by using Feynman-Hellman theory\, more\ntrace measurements (like
${\\mathrm Tr}(D^{-n})$ for $\\kappa$\,\n$c_{\\mathrm{SW}}$ and chemical
potential reweighting)\, a more flexible\nintegration scheme\, polynomial
filtering\, term-splitting for RHMC\, and a\nportable implementation of pe
rformance critical parts employing SIMD\nintrinsics.\n\nhttps://makondo.ug
r.es/event/0/session/24/contribution/216
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/216
END:VEVENT
BEGIN:VEVENT
SUMMARY:How to Identify Zero Modes for Improved Staggered Fermions
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-195@cern.ch
DESCRIPTION:Speakers: Mr. JEONG\, Hwancheol (Seoul National University)\nI
n the calculation of quark condensates using staggered fermions\, the cont
ribution induced by the zero modes of the Dirac operator behaves as a simp
le pole as approaching to the chiral limit. We use Lanczos algorithm to fi
nd the would-be zero modes of the staggered Dirac operator and identify th
eir quantum numbers by the spectral flow method. We plan to apply this met
hod to the calculation of quark condensates free of the zero modes.\n\nhtt
ps://makondo.ugr.es/event/0/session/24/contribution/195
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/195
END:VEVENT
BEGIN:VEVENT
SUMMARY:Colour fields of the quark-antiquark excited flux tube
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-190@cern.ch
DESCRIPTION:Speakers: BICUDO\, Pedro (IST Lisboa)\nWe present colour field
density profiles for some of the first SU(3) gluonic excitations of the f
lux tube in the presence of a static quark-antiquark pair.\nThe results ar
e obtained from a large set of gluonic operators.\n\nhttps://makondo.ugr.e
s/event/0/session/24/contribution/190
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/190
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD in a moving frame: an exploratory study
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-219@cern.ch
DESCRIPTION:Speakers: Dr. DALLA BRIDA\, Mattia (Universita' di Milano-Bico
cca & INFN)\nThe framework of shifted boundary conditions has proven to be
a very powerful tool for the study of thermal quantum field theories. For
instance\, it has been considered for the determination of the equation o
f state of the Yang-Mills theory with high accuracy. The set-up of shifted
boundary conditions can be generalized to QCD and it is expected to lead
to a similar breakthrough. We present results of an exploratory investigat
ion of QCD with 3-flavours of Wilson fermions.\n\nhttps://makondo.ugr.es/e
vent/0/session/24/contribution/219
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/219
END:VEVENT
BEGIN:VEVENT
SUMMARY:The IMOM renormalization scheme on the lattice
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-115@cern.ch
DESCRIPTION:Speakers: Dr. PERLT\, Holger (Leipzig University)\nThe symmetr
ic momentum subtraction scheme (SMOM) has been introduced to\novercome exc
eptional momentum flows. However\, it is quite restrictive\nto the momentu
m choice - the momentum squared of all legs are identical.\nTherefore\, a
generalization called interpolating momentum subtraction\nscheme (IMOM) ha
s been developed\, where a free parameter $\\omega$\nallows for more freed
om in the momentum assignment. Especially\,\non lattices this is of great
importance.\nWe investigate the IMOM scheme for local operators for small
coupling\nand compare with results obtained in continuum 2-loop perturbat
ion\ntheory. The implications for larger couplings are discussed.\n\nhttps
://makondo.ugr.es/event/0/session/24/contribution/115
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/115
END:VEVENT
BEGIN:VEVENT
SUMMARY:Getting even with CLE
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-134@cern.ch
DESCRIPTION:Speakers: Dr. SEILER\, Erhard (Max-Planck-Institut f\\"ur Phys
ik (Werner-Heisenberg-Institut))\nIn the landscape of approaches toward th
e simulation of Lattice Models with complex action the Complex Langevin Eq
uation (CLE) appears as a straightforward method with a simple\, well defi
ned set up. Its applicability\, however\, is controlled by certain specifi
c conditions which are not always satisfied\, such as holomorphy and limit
ed diffusion in the non-compact directions. We here provide some details a
bout what this method can (and did) achieve\, which are its present limita
tions and which are its prospects. This includes a discussion of the diffi
culties related with the mentioned conditions and of the procedures design
ed to meet them\, such as various kinds of “cooling” and the estimatio
n of systematic errors. We involve tests and insights from simple\, solvab
le models and present results from lattice models\, including QCD\, especi
ally concerning the attempt to explore the phase diagram of the latter at
non-zero chemical potential.\n\nhttps://makondo.ugr.es/event/0/session/24/
contribution/134
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/134
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice studies of the charmonium spectrum
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-138@cern.ch
DESCRIPTION:Speakers: Mr. WEISHÄUPL\, Simon (Universität Regensburg)\nTh
e nature of resonances and excited states near decay thresholds is encoded
in phase shifts\, which can be extracted from single-particle and multipa
rticle correlators in finite volumes. Lattice calculations have only recen
tly reached the required precision for a reliable study of such correlator
s. The distillation method has been a significative improvement insofar as
it simplifies quark contractions and allows one to easily extend the oper
ator basis used to construct meson interpolators. We present preliminary
results on charmonium bound states and resonances on the $N_f=2+1$ CLS ens
embles. The main aim of our investigation is to understand the properties
of the X resonances that do not fit into conventional models of quark-anti
quark mesons. We tune various parameters of the distillation method and th
e charm quark mass. In particular we present the masses of the ground and
excited states in the $0^{++}$ and $1^{--}$ channels and discuss the exist
ance and the mass of the excited state of the $\\chi_{c0}$.\n\nhttps://mak
ondo.ugr.es/event/0/session/24/contribution/138
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/138
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmonia in flight
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-119@cern.ch
DESCRIPTION:Speakers: Prof. PRELOVSEK\, Sasa (University of Ljubljana)\nLa
ttice simulation of charmonium resonances with non-zero momentum provides
additional information on the\nrelevant two-meson scattering matrices. How
ever\, the reduced rotational symmetry in a moving frame renders \na numbe
r of states with different J^P in the same lattice irreducible representat
ion. The identification of the underlying spin and parity for these states
is particularly important for heavy quarkonia\, since their spectra conta
in a number of states with different J^P in a relatively narrow energy reg
ion. Preliminary results concerning spin-identification will be presented
in relation to our study of charmonium resonances in flight on the Nf=2+1
CLS ensembles.\n\nhttps://makondo.ugr.es/event/0/session/24/contribution/
119
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/119
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computation of parton distribution functions from the quasi-PDF ap
proach at the physical point
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-165@cern.ch
DESCRIPTION:Speakers: Ms. SCAPELLATO\, Aurora (University of Cyprus and Un
iversity of Wuppertal)\nParton distribution functions provide an important
insight into the inner structure of hadrons\, by giving information on th
e momentum and spin distribution of partons. Extracting parton distributio
n functions (PDFs) directly from Lattice QCD has been thought impossible\,
since they are given in terms of non-local light cone correlations in Mi
nkowski space-time and light-like distances are not accessible on a Euclid
ean lattice. Recently a new approach was proposed to compute quasi-distrib
utions. It requires the computation of purely spatial correlations\, which
is completely feasible with lattice methods. We present results for the i
so-vector combination for the unpolarized\, helicity and transversity quas
i-distributions\, obtained with $N_f=2$ twisted mass clover-improved fermi
ons at the physical pion mass and discuss their matching to the physical P
DFs.\n\nhttps://makondo.ugr.es/event/0/session/24/contribution/165
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/165
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vector-Vector Scattering on the Lattice
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-237@cern.ch
DESCRIPTION:Speakers: Mr. ROMERO-LOPEZ\, Fernando (Uni Bonn)\nIn this work
we present an extension of the Lüscher formalism to include the interact
ion of particles with spin\, focusing on the scattering of two vector part
icles. The derived formalism will be applied to Scalar QED in the Higgs Ph
ase\, where the U(1) gauge boson acquires mass.\n\nhttps://makondo.ugr.es/
event/0/session/24/contribution/237
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/237
END:VEVENT
BEGIN:VEVENT
SUMMARY:Improvement of heavy-heavy current for calculation of $\\bar{B}\\r
ightarrow D^{(*)}\\ell\\bar{\\nu}$ form factors using Oktay-Kronfeld heavy
-quark
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-200@cern.ch
DESCRIPTION:Speakers: Mr. LEEM\, JAEHOON (Seoul National University)\nIt i
s necessary to improve flavor-changing currents for calculating $\\bar{B}\
\rightarrow D^{(*)}\\ell\\bar{\\nu}$ semi-leptonic form factors using Okta
y-Kronfeld (OK) heavy-quarks. The OK action reduces the heavy-quark discre
tization effect up to $\\mathcal{O}(\\lambda^3)$ in the HQET power countin
g. To get a full advantage of the OK action\, we need to improve the curre
nts up to the same level as well. We check the redundancy in operators add
ed for the improvement\, and address other remaining issues. We report the
recent progress.\n\nhttps://makondo.ugr.es/event/0/session/24/contributio
n/200
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/200
END:VEVENT
BEGIN:VEVENT
SUMMARY:Singlet vs Nonsinglet Perturbative Renormalization factors of Ferm
ion Bilinears
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-101@cern.ch
DESCRIPTION:Speakers: Mr. SPANOUDES\, Gregoris (University Of Cyprus)\nIn
this work we present the perturbative computation of the difference betwee
n the renormalization factors of flavor singlet and nonsinglet bilinear qu
ark operators (scalar\, pseudoscalar\, vector\, axial vector and tensor) o
n the lattice. Nonperturbative estimates of the renormalization factors fo
r the singlet operators are notoriously difficult to obtain via numerical
simulations\, due to the presence of (fermion line) disconnected diagrams\
, which in principle require evaluation of the full fermion propagator. Th
en it is quite a challenge to obtain accurate results for the renormalizat
ion of the singlet operators directly. Given that the renormalization fact
ors of the nonsinglet operators can be calculated nonperturbatively with q
uite good precision\, we can give an estimate of the renormalization facto
rs for the singlet operators through the perturbative evaluation of the di
fference between singlet and nonsinglet cases. The computation is performe
d to two loops and to lowest order in the lattice spacing\, using Symanzik
improved gluons and staggered fermions with twice stout-smeared links. Th
e stout smearing procedure is also applied to the definition of bilinear o
perators. A significant part of this work is the development of a method f
or treating some new peculiar divergent integrals stemming from the stagge
red formalism. The corresponding calculation with Wilson/clover fermions h
ad been previously performed by our group. The results have been published
in Physical Review D (M. Constantinou\, M. Hadjiantonis\, H. Panagopoulos
\, G. Spanoudes\, “Singlet versus Nonsinglet Perturbative Renormalizatio
n of Fermion Bilinears”\, Phys. Rev. D94 (2016) 114513 [arXiv: 1610.0674
4]).\n\nhttps://makondo.ugr.es/event/0/session/24/contribution/101
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/101
END:VEVENT
BEGIN:VEVENT
SUMMARY:Berezinskii-Kosterlitz-Thouless phase transition from lattice Sine
-Gordon model
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-96@cern.ch
DESCRIPTION:Speakers: Prof. GIEDT\, Joel (Rensselaer Polytechnic Institute
)\nWe present preliminary simulation results of the lattice sine-Gordon mo
del which show evidence of the Berezinskii-Kosterlitz-Thouless phase trans
ition. Our simulation algorithm uses Fourier accelerated hybrid Monte Carl
o techniques to reduce autocorrelations. The BKT transition involves a to
pological phase\, with no local order parameter\, driven by the physics of
topological defects. The sine-Gordon model captures the essential physics
of vortices in the XY model and is dual to a two-dimensional Coulomb gas.
Our work further validates earlier work of Hasenbusch et al. (1994)\, and
extends the study to include other thermodynamic quantities and regions o
f parameter space\, including some quantitative results on the critical li
ne t_c(y)\, where y is the vortex fugacity and t_c is the critical tempera
ture of the roughening transition.\n\nhttps://makondo.ugr.es/event/0/sessi
on/24/contribution/96
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/96
END:VEVENT
BEGIN:VEVENT
SUMMARY:The mass decomposition of proton
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-60@cern.ch
DESCRIPTION:Speakers: Prof. LIU\, Keh-Fei (University of Kentucky)\nUnlike
the simple picture shown by the quark model\, the origin of the proton ma
ss based on the related experiments results are pretty complicated and cha
llenge our understanding of the QCD physics at the non-perturbative region
. I should show our recent lattice QCD results on the decomposition of the
proton mass and how important the gluon components are.\n\nhttps://makond
o.ugr.es/event/0/session/24/contribution/60
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/60
END:VEVENT
BEGIN:VEVENT
SUMMARY:N=1 supersymmetric Yang-Mills theory on the lattice
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-30@cern.ch
DESCRIPTION:Speakers: Prof. MÜNSTER\, Gernot (University of Münster)\nN=
1 supersymmetric Yang-Mills theory describes interacting gauge\nfields and
their superpartners\, the spin 1/2 gluinos. A gluino mass term\nbreaks su
persymmetry softly. In the supersymmetric limit\, the physical\nparticles
are expected to form supermultiplets. In our numerical simulations\nwith g
auge groups SU(2) and SU(3) we obtained results for the masses of the\nlow
est lying bound states and some excited states\, the SUSY Ward identities\
nand other quantities of interest. This poster gives an overview of the\np
roject and its status.\n\nhttps://makondo.ugr.es/event/0/session/24/contri
bution/30
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/30
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization of Supersymmetric QCD on the Lattice
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-37@cern.ch
DESCRIPTION:Speakers: Dr. COSTA\, Marios (University of Cyprus)\nWe perfor
m a pilot study of the perturbative renormalization of a Supersymmetric ga
uge theory with matter fields on the lattice. As a specific example\, we c
onsider Supersymmetric N =1 QCD (SQCD). We study the self-energies of all
particles which appear in this theory\, as well as the renormalization of
the coupling constant. To this end we compute\, perturbatively to one-loop
\, the relevant two-point and three-point Green’s functions using both t
he dimensional and the lattice regularizations. Our lattice formulation in
volves the Wilson discretization for the gluino and quark fields\; for glu
ons we employ the Wilson gauge action\; for scalar fields (squarks) we use
naive discretization. The gauge group that we consider is SU(Nc)\, while
the number of colors\, Nc \, the number of flavors\, Nf \, and the gauge p
arameter\, α\, are left unspecified. We obtain analytic expressions for t
he renormalization functions of the coupling constant (Zg) and of the quar
k (Zψ)\, gluon (Zu)\, gluino (Zλ)\, squark (ZA± )\, ghost (Zc) fields\,
on the lattice. We also compute the critical values of the gluino\, quark
and squark masses. Finally\, we address the mixing which occurs among squ
ark degrees of freedom beyond tree level: we calculate the corresponding m
ixing matrix\nwhich is necessary in order to disentangle the components of
the squark field via an additional finite renormalization.\n\nhttps://mak
ondo.ugr.es/event/0/session/24/contribution/37
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/37
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fast algorithms for chiral fermions in 2 dimensions
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-116@cern.ch
DESCRIPTION:Speakers: Dr. OSMANAJ (ZEQIRLLARI)\, Rudina (University of Tir
ana\, Faculty of Natural Sciences\, Department of Physics)\nIn lattice QCD
simulations the formulation of the theory in lattice should be chiral in
order that symmetry breaking happens dynamically from interactions. In ord
er to guarantee this symmetry on the lattice one uses overlap and domain w
all fermions. On the other hand high computational cost of lattice QCD sim
ulations with overlap or domain wall fermions remains a major obstacle of
research in the field of elementary particles. We have developed the preco
nditioned GMRESR algorithm as fast inverting algorithm for chiral fermions
in U(1) lattice gauge theory. In this algorithm we used the geometric mul
tigrid idea along the extra dimension. The main result of this work is tha
t the preconditioned GMRESR is capable to accelerate the convergence 2 to
12 times faster than the other optimal algorithms (SHUMR) for different co
upling constant and lattice 32 x 32. Also\, in this paper we tested it fo
r larger lattice size 64 x 64. From the results of simulations we can see
that our algorithm is faster than SHUMR. This is a very promising result t
hat this algorithm can be adapted also in 4 dimension.\n\nhttps://makondo.
ugr.es/event/0/session/24/contribution/116
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/116
END:VEVENT
BEGIN:VEVENT
SUMMARY:SU(3) Yang Mills at small distances and fine lattices
DTSTART;VALUE=DATE-TIME:20170620T173000Z
DTEND;VALUE=DATE-TIME:20170620T183000Z
DTSTAMP;VALUE=DATE-TIME:20200219T032117Z
UID:indico-contribution-24-0-469@cern.ch
DESCRIPTION:Speakers: Mr. SOMMER\, Rainer (NIC @ DESY)\nWe investigate the
SU(3) Yang Mills theory at small gradient flow time\nand at short distanc
es. Lattice spacings down to a=0.015fm are simulated with open boundary co
nditions to allow topology to flow in and out.\nWe study the behavior of
the action density E(t) close to the boundaries\,\nthe feasibility of the
small flow time expansion and the extraction of\nthe $\\Lambda$-parameter
from the static force at small distances.\nFor the latter\, significant de
viations from the 4-loop perturbative $\\beta$-function are visible at $\\
alpha \\approx 0.2$. We still can extrapolate to extract $\\Lambda\n\\time
s r_0$.\n\nhttps://makondo.ugr.es/event/0/session/24/contribution/469
LOCATION:Palacio de Congresos
URL:https://makondo.ugr.es/event/0/session/24/contribution/469
END:VEVENT
END:VCALENDAR