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High Energy Physics - Lattice papers — page 203

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B → π ν with Möbius Domain Wall Fermions
We report on the status of our calculation of the exclusive semileptonic decay, B→ π ν; a key process in the determination of the CKM matrix element |Vub|. The Möbius domain wall…
Brian Colquhoun, Shoji Hashimoto, Takashi KanekoOct 19, 2017
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An estimate for the thermal photon rate from lattice QCD
We estimate the production rate of photons by the quark-gluon plasma in lattice QCD. We propose a new correlation function which provides better control over the systematic uncertainty in estimating…
Bastian B. Brandt, Anthony Francis, Tim Harris et al.Oct 19, 2017
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Higgs compositeness in Sp(2N) gauge theories --- The pure gauge model
As a first step in the study of Sp(2N) composite Higgs models, we obtained a set of novel numerical results for the pure gauge Sp(4) lattice theory in 3+1 space-time dimensions.…
Ed Bennett, Deog Ki Hong, Jong-Wan Lee et al.Oct 19, 2017
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DD-αAMG on QPACE 3
We describe our experience porting the Regensburg implementation of the DD-αAMG solver from QPACE 2 to QPACE 3. We first review how the code was ported from the first generation Intel Xeon Phi…
Peter Georg, Daniel Richtmann, Tilo WettigOct 19, 2017
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Testing algorithms for critical slowing down
We present the preliminary tests on two modifications of the Hybrid Monte Carlo (HMC) algorithm. Both algorithms are designed to travel much farther in the Hamiltonian phase space for each trajectory…
Guido Cossu, Peter Boyle, Norman Christ et al.Oct 19, 2017
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Unification of the complex Langevin method and the Lefschetz-thimble method
Recently there has been remarkable progress in solving the sign problem, which occurs in investigating statistical systems with a complex weight. The two promising methods, the complex Langevin…
Jun Nishimura, Shinji ShimasakiOct 19, 2017
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Non-perturbative determination of improvement b-coefficients in Nf=3
We present our preliminary results of the non-perturbative determination of the valence mass dependent coefficients bA-bP and bm as well as the ratio $ZP…
Giulia Maria de Divitiis, Maurizio Firrotta, Jochen Heitger et al.Oct 19, 2017
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4D N=1 SYM supercurrent on the lattice in terms of the gradient flow
The gradient flow[1-5] gives rise to a versatile method to construct renormalized composite operators in a regularization-independent manner. By adopting this method, the authors of~Refs.[6-9]…
Kenji Hieda, Aya Kasai, Hiroki Makino et al.Oct 19, 2017
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η and η masses and decay constants
We present preliminary results for the masses and decay constants of the η and η mesons using CLS Nf = 2+1 ensembles. One of the major challenges in these calculations are the large…
Gunnar Bali, Sara Collins, Jakob SimethOct 18, 2017
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Update on K with lattice QCD inputs
We report updated results for K, the indirect CP violation parameter in neutral kaons, which is evaluated directly from the standard model with lattice QCD inputs. We use lattice QCD…
Yong-Chull Jang, Weonjong Lee, Sunkyu Lee et al.Oct 18, 2017
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Flavor-singlet spectrum in multi-flavor QCD
Studying SU(3) gauge theories with increasing number of light fermions is relevant both for understanding the strong dynamics of QCD and for constructing strongly interacting extensions of the…
Yasumichi Aoki, Tatsumi Aoyama, Ed Bennett et al.Oct 18, 2017
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Wilson and Domainwall Kernels on Oakforest-PACS
We report the performance of Wilson and Domainwall Kernels on a new Intel Xeon Phi Knights Landing based machine named Oakforest-PACS, which is co-hosted by University of Tokyo and Tsukuba University…
Issaku Kanamori, Hideo MatsufuruOct 18, 2017
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Simulating lattice field theories on multiple thimbles
Simulating thimble regularization of lattice field theory can be tricky when more than one thimble is to be taken into account. A couple of years ago we proposed a solution for this problem. More…
Francesco Di RenzoOct 18, 2017
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Chiral condensate and Dirac spectrum of one- and two-flavor QCD at nonzero θ-angle
In the ε-domain of QCD we have obtained exact analytical expressions for the eigenvalue density of the Dirac operator at fixed θ 0 for both one and two flavors. These results made it possible…
Mario Kieburg, Jacobus Verbaarschot, Tilo WettigOct 18, 2017
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Higgs compositeness in Sp(2N) gauge theories - Determining the low-energy constants with lattice calculations
As a first step towards a quantitative understanding of the SU(4)/Sp(4) composite Higgs model through lattice calculations, we discuss the low energy effective field theory resulting from the SU(4)…
Ed Bennett, Deog Ki Hong, Jong-Wan Lee et al.Oct 18, 2017
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Multi-Grid Lanczos
We present a Lanczos algorithm utilizing multiple grids that reduces the memory requirements both on disk and in working memory by one order of magnitude for RBC/UKQCD's 48I and 64I ensembles at…
M. A. Clark, Chulwoo Jung, Christoph LehnerOct 18, 2017
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A precise determination of the HVP contribution to the muon anomalous magnetic moment from lattice QCD
In this talk I present the current status of a precise first-principles calculation of the quark connected, quark disconnected, and leading QED and strong isospin-breaking contributions to the…
Christoph LehnerOct 18, 2017
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Conformal window in SU(2) with fundamental fermions
We present the updated results of the infrared behavior of the SU(2) 6 and 8 fundamental representation fermions. We use the gradient flow method with the Schrödinger functional boundary conditions…
Viljami Leino, Jarno Rantaharju, Teemu Rantalaiho et al.Oct 18, 2017
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Towards leading isospin breaking effects in mesonic masses with O(a) improved Wilson fermions
We present an exploratory study of leading isospin breaking effects in mesonic masses using O(a) improved Wilson fermions. Isospin symmetry is explicitly broken by distinct masses and electric…
Andreas Risch, Hartmut WittigOct 18, 2017
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Higgs compositeness in Sp(2N) gauge theories --- Resymplecticisation, scale setting and topology
As part of an ongoing programme to study Sp(2N) gauge theories as potential realisations of composite Higgs models, we consider the case of Sp(4) on the lattice, both as a pure…
Ed Bennett, Deog Ki Hong, Jong-Wan Lee et al.Oct 18, 2017
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Direct detection of metal-insulator phase transitions using the modified Backus-Gilbert method
The detection of the (semi)metal-insulator phase transition can be extremely difficult if the local order parameter which characterizes the ordered phase is unknown.In some cases, it is even…
M. V. Ulybyshev, C. Winterowd, S. ZafeiropoulosOct 18, 2017
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Nucleon structure from 2+1-flavor domain-wall QCD
Nucleon-structure calculations of isovector vector- and axialvector-current form factors, transversity and scalar charge, and quark momentum and helicity fractions are reported from two recent…
Shigemi OhtaOct 18, 2017
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Topological susceptibility with a single light quark flavour
One of the historical suggestions to tackle the strong CP problem is to take the up quark mass to zero while keeping md finite. The θ angle is then supposed to become irrelevant, i.e. the…
Julien Frison, Ryuichiro Kitano, Norikazu YamadaOct 18, 2017
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Leading isospin-breaking corrections to meson masses on the lattice
We present a study of the isospin-breaking (IB) corrections to pseudoscalar (PS) meson masses using the gauge configurations produced by the ETM Collaboration with Nf=2+1+1 dynamical quarks at…
D. Giusti, V. Lubicz, G. Martinelli et al.Oct 18, 2017
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Dirac-mode analysis for quark number density and its application for deconfinement transition
The quark number density at finite imaginary chemical potential is investigated in the lattice QCD using the Dirac-mode expansion. We find the analytical formula of the quark number density in terms…
Takahiro M. Doi, Kouji KashiwaOct 18, 2017
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