Nucleon form factors and couplings with Nf = 2 + 1 Wilson fermionsWe present updated results on the nucleon electromagnetic form factors and axial coupling calculated using CLS ensembles with Nf=2+1 dynamical flavours of Wilson fermions. The…Dalibor Djukanovic, Tim Harris, Georg von Hippel et al.·Nov 23, 2016SaveLearn
On the Statistics of Baryon Correlation Functions in Lattice QCDA systematic analysis of the structure of single-baryon correlation functions calculated with lattice QCD is performed, with a particular focus on characterizing the structure of the noise associated…Michael L. Wagman, Martin J. Savage·Nov 23, 2016SaveLearn
Dyons and Roberge - Weiss transition in lattice QCDWe study lattice QCD with Nf=2 Wilson fermions at nonzero imaginary chemical potential and nonzero temperature. We relate the Roberge - Weiss phase transition to the properties of dyons which are…V. G. Bornyakov, D. L. Boyda, V. A. Goy et al.·Nov 23, 2016SaveLearn
Importance of closed quark loops for lattice QCD studies of tetraquarksTo investigate the light scalar tetraquark candidate a0(980) (quantum numbers JP =0+), a correlation matrix including a variety of two- and four-quark interpolating operators has to be…Joshua Berlin, Abdou Abdel-Rehim, Constantia Alexandrou et al.·Nov 23, 2016SaveLearn
Isovector charges of the nucleon from 2+1-flavor QCD with clover fermionsWe present high-statistics estimates of the isovector charges of the nucleon from four 2+1-flavor ensembles generated using Wilson-clover fermions with stout smearing and tree-level tadpole improved…Boram Yoon, Yong-Chull Jang, Rajan Gupta et al.·Nov 22, 2016SaveLearn
A numerical study of non-perturbative corrections to the Chiral Separation Effect in quenched finite-density QCDWe demonstrate the non-renormalization of the Chiral Separation Effect (CSE) in quenched finite-density QCD in both confinement and deconfinement phases using a recently developed numerical method…M. Puhr, P. V. Buividovich·Nov 22, 2016SaveLearn
Infrared properties of a prototype model for beyond-Standard Model physicsWe construct a prototype BSM model based on the SU(3) color gauge group and a combination of 4 light (massless) and 8 heavy flavors. In the infrared, the SU(4) flavor chiral symmetry is spontaneously…Anna Hasenfratz, Claudio Rebbi, Oliver Witzel·Nov 22, 2016SaveLearn
Decay constants fB and fBs and quark masses mb and mc from HISQ simulationsWe present a progress report on our calculation of the decay constants fB and fBs from lattice-QCD simulations with highly-improved staggered quarks. Simulations are carried out with several…J. Komijani, A. Bazavov, C. Bernard et al.·Nov 22, 2016SaveLearn
Resonances in Coupled-Channel ScatteringExcited hadrons are seen as resonances in the scattering of lighter stable hadrons like π, K and η. Many decay into multiple final states necessitating coupled-channel analyses. Recently it has…David J. Wilson·Nov 22, 2016SaveLearn
Perturbative running of the twisted Yang-Mills coupling in the gradient flow schemeWe report on our ongoing computation of the perturbative running of the Yang-Mills coupling using gradient flow techniques. In particular, we use the gradient flow method with twisted boundary…Eduardo I. Bribian, Margarita Garcia Perez·Nov 22, 2016SaveLearn
Volume reduction through perturbative Wilson loopsWe derive the perturbative expansion of Wilson loops to order g4 in a SU(N) lattice gauge theory with twisted boundary conditions. Our expressions show that the thermodynamic limit is attained at…Margarita Garcia Perez, Antonio Gonzalez-Arroyo, Masanori Okawa·Nov 22, 2016SaveLearn
Nf=1+2 mass dependence of the topological susceptibilityA massless up quark has long been proposed as a solution to the strong CP problem. While this solution is sometimes thought to have been excluded, it is actually still ill-defined. In this work, we…Julien Frison, Ryuichiro Kitano, Norikazu Yamada·Nov 22, 2016SaveLearn
Gluon momentum fraction of the nucleon from lattice QCDWe perform a direct calculation of the gluon momentum fraction of the nucleon using maximally twisted mass fermion ensembles with Nf=2+1+1 flavors at a pion mass of about 370\,MeV and a…Constantia Alexandrou, Martha Constantinou, Kyriakos Hadjiyiannakou et al.·Nov 21, 2016SaveLearn
Hierarchically deflated conjugate residualWe present a progress report on a new class of multigrid solver algorithm suitable for the solution of 5d chiral fermions such as Domain Wall fermions and the Continued Fraction overlap. Unlike HDCG…Azusa Yamaguchi, Peter Boyle·Nov 21, 2016SaveLearn
A massive momentum-subtraction schemeA new renormalization scheme is defined for fermion bilinears in QCD at non vanishing quark masses. This new scheme, denoted RI/mSMOM, preserves the benefits of the nonexceptional momenta introduced…Peter Boyle, Luigi Del Debbio, Ava Khamseh·Nov 21, 2016SaveLearn
Towards extracting the timelike pion form factor on CLS 2-flavour ensemblesResults are presented from an ongoing study of the ρ resonance. We use the distillation approach in order to create correlator matrices involving ρ and ππ interpolators. The study is done in a…Felix Erben, Jeremy Green, Daniel Mohler et al.·Nov 21, 2016SaveLearn
Charm Physics with Domain Wall Fermions and Physical Pion MassesWe present RBC/UKQCD's charm project using Nf=2+1 flavour ensembles with inverse lattice spacings in the range 1.73-2.77\,GeV and two physical pion mass ensembles. Domain wall…Peter Boyle, Luigi Del Debbio, Andreas Jüttner et al.·Nov 21, 2016SaveLearn
QCD phase diagram with isospin chemical potentialIn this contribution we investigate the phase diagram of QCD in the presence of an isospin chemical potential. To alleviate the infrared problems of the theory associated with pion condensation, we…Bastian B. Brandt, Gergely Endrodi·Nov 21, 2016SaveLearn
Latest results from lattice N=4 supersymmetric Yang--MillsWe present some of the latest results from our numerical investigations of N=4 supersymmetric Yang--Mills theory formulated on a space-time lattice. Based on a construction that exactly preserves a…David Schaich, Simon Catterall, Poul H. Damgaard et al.·Nov 20, 2016SaveLearn
Long distance part of εK from lattice QCDWe demonstrate the lattice QCD calculation of the long distance contribution to εK. Due to the singular, short-distance structure of εK, we must perform a short-distance subtraction and…Ziyuan Bai·Nov 20, 2016SaveLearn
What lattice QCD spectral functions can tell us about heavy quarkonium in the QGPThe bound states of a heavy quark and antiquark (cc, bb) are ideal probes to explore the quark-gluon plasma created in relativistic heavy-ion collisions at the RHIC and LHC. Not only…Alexander Rothkopf·Nov 20, 2016SaveLearn
A gauge invariant Debye mass for the complex heavy-quark potentialThe concept of a screening mass is a powerful tool to simplify the intricate physics of in-medium test charges surrounded by light charge carriers. While it has been successfully used to describe…Yannis Burnier, Alexander Rothkopf·Nov 20, 2016SaveLearn
Does the complex Langevin method give unbiased results?We investigate whether the stationary solution of the Fokker-Planck equation of the complex Langevin algorithm reproduces the correct expectation values. When the complex Langevin algorithm for an…L. L. Salcedo·Nov 19, 2016SaveLearn
Controlling quark mass determinations non-perturbatively in three-flavour QCDThe determination of quark masses from lattice QCD simulations requires a non-perturbative renormalization procedure and subsequent scale evolution to high energies, where a conversion to the…Isabel Campos, Patrick Fritzsch, Carlos Pena et al.·Nov 18, 2016SaveLearn
Chiral Perturbation Theory at Finite Volume and/or with Twisted Boundary ConditionsIn this talk we discuss a number of ChPT calculations relevant for lattice QCD. These include the finite volume corrections at two-loop order for masses and decay constants. The second part is about…Johan Bijnens, Johan Relefors·Nov 18, 2016SaveLearn