Λb Λ+ - form factors, differential branching fraction, and angular observables from lattice QCD with relativistic b quarksUsing (2+1)-flavor lattice QCD, we compute the 10 form factors describing the Λb Λ matrix elements of the b s vector, axial vector, and tensor currents. The calculation is based on…William Detmold, Stefan Meinel·Feb 3, 2016SaveLearn
Long distance contributions to the rare kaon decay Kπ+-The rare decays of a kaon into a pion and a charged lepton/antilepton pair proceed via a flavour changing neutral current and therefore may only be induced beyond tree level in the Standard Model.…Norman Christ, Xu Feng, Andreas Juttner et al.·Feb 3, 2016SaveLearn
Chiral Random Matrix Model at Finite Chemical Potential: Characteristic Determinant and Edge UniversalityWe derive an exact formula for the stochastic evolution of the characteristic determinant of a class of deformed Wishart matrices following from a chiral random matrix model of QCD at finite chemical…Yizhuang Liu, Maciej A. Nowak, Ismail Zahed·Feb 2, 2016SaveLearn
S-parameter and vector decay constant in QCD with eight fundamental fermionsSU(3) gauge theory with eight massless fundamental fermions seems to be near the conformal boundary, and is a candidate theory of walking technicolor. Along the series of study by LatKMI…LatKMI collaboration, Yasumichi Aoki, Tatsumi Aoyama et al.·Feb 2, 2016SaveLearn
Threshold expansion of the three-particle quantization conditionWe recently derived a quantization condition for the energy of three relativistic particles in a cubic box. Here we use this condition to study the energy level closest to the three-particle…Maxwell T. Hansen, Stephen R. Sharpe·Jan 31, 2016SaveLearn
A Lattice Study of (D1 D*) Near-threshold ScatteringIn this exploratory lattice study, low-energy near threshold scattering of the (D1 D*) meson system is analyzed using lattice QCD with Nf=2 twisted mass fermion configurations.…Ting Chen, Ying Chen, Ming Gong et al.·Jan 31, 2016SaveLearn
Two Photon Decays of ηc from Lattice QCDWe present an exploratory lattice study for the two-photon decay of ηc using Nf=2 twisted mass lattice QCD gauge configurations generated by the European Twisted Mass Collaboration. Two…Ting Chen, Ying Chen, Ming Gong et al.·Jan 30, 2016SaveLearn
Polyakov loop correlators and cyclic Wilson loop from lattice QCDWe discuss color screening in 2+1 flavor QCD in terms of free energies of a static quark-antiquark pair. Thermal modifications of long distance correlations in quark-antiquark systems are studied in…Alexei Bazavov, Peter Petreczky, Johannes Heinrich Weber·Jan 29, 2016SaveLearn
Chiral behavior of light meson form factors in 2+1 flavor QCD with exact chiral symmetryWe present a study of chiral behavior of light meson form factors in QCD with three flavors of overlap quarks. Gauge ensembles are generated at single lattice spacing 0.12 fm with pion masses down to…JLQCD Collaboration, T. Kaneko, S. Aoki et al.·Jan 28, 2016SaveLearn
Width of the flux tube in compact U(1) gauge theory in three dimensionsWe study the squared width and the profile of flux tubes in compact U(1) lattice gauge theory in three spacetime dimensions. The results obtained from numerical calculations in the dual formulation…Michele Caselle, Marco Panero, Davide Vadacchino·Jan 27, 2016SaveLearn
A multilevel algorithm for flow observables in gauge theoriesWe study the possibility of using multilevel algorithms for the computation of correlation functions of gradient flow observables. For each point in the correlation function an approximate flow is…Miguel García Vera, Stefan Schaefer·Jan 26, 2016SaveLearn
Correlation functions with Karsten-Wilczek fermionsThe Karsten-Wilczek action describes two chiral fermions but breaks the symmetries under both charge conjugation ( C) and time reflection ( Θ ) explicitly, though invariance…Johannes Heinrich Weber·Jan 25, 2016SaveLearn
Leptonic decay-constant ratio fK/fπ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearingWe present a calculation of the leptonic decay-constant ratio fK/fπ in 2+1 flavor QCD. Our data set includes five lattice spacings and pion masses reaching down below the physical one. Special…Stephan Dürr, Zoltán Fodor, Christian Hoelbling et al.·Jan 22, 2016SaveLearn
Lattice QCD calculations of nucleon transverse momentum-dependent parton distributions using clover and domain wall fermionsWe present a lattice QCD calculation of transverse momentum dependent parton distribution functions (TMDs) of protons using staple-shaped Wilson lines. For time-reversal odd observables, we calculate…B. Yoon, T. Bhattacharya, M. Engelhardt et al.·Jan 21, 2016SaveLearn
Nucleon generalized form factors from lattice QCD with nearly physical quark massesWe determine generalized form factors of the nucleon from lattice simulations with Nf = 2 mass-degenerate non-perturbatively improved Wilson-Sheikholeslami-Wohlert fermions down to a pion mass of…Gunnar Bali, Sara Collins, Meinulf Göckeler et al.·Jan 19, 2016SaveLearn
Update on Heavy-Meson Spectrum Tests of the Oktay--Kronfeld ActionWe present updated results of a numerical improvement test with heavy-meson spectrum for the Oktay--Kronfeld (OK) action. The OK action is an extension of the Fermilab improvement program for massive…Jon A. Bailey, Yong-Chull Jang, Weonjong Lee et al.·Jan 18, 2016SaveLearn
Topological observables in many-flavour QCDSU(3) gauge theory with eight massless flavours is believed to be walking, while the corresponding twelve- and four-flavour appear IR-conformal and confining respectively. Looking at the simulations…Yasumichi Aoki, Tatsumi Aoyama, Ed Bennett et al.·Jan 18, 2016SaveLearn
Lattice and string worldsheet in AdS/CFT: a numerical studyWe consider a possible discretization for the gauge-fixed Green-Schwarz (two-dimensional) sigma-model action for the Type IIB superstring and use it for measuring the cusp anomalous dimension of…Valentina Forini, Lorenzo Bianchi, Marco S. Bianchi et al.·Jan 18, 2016SaveLearn
Domain decomposition, multi-level integration and exponential noise reduction in lattice QCDWe explore the possibility of computing fermionic correlators on the lattice by combining a domain decomposition with a multi-level integration scheme. The quark propagator is expanded in series of…Marco Cè, Leonardo Giusti, Stefan Schaefer·Jan 18, 2016SaveLearn
Critical point search from an extended parameter space of lattice QCD at finite temperature and densityAiming to understand the phase structure of lattice QCD at nonzero temperature and density, we study the phase transitions of QCD in an extended parameter space, where the number of flavor and quark…Shinji Ejiri, Ryo Iwami, Norikazu Yamada·Jan 18, 2016SaveLearn
Continuum limit of the leading order HQET form factor in Bs Kν decaysWe discuss the computation of form factors for semi-leptonic decays of B-, Bs- mesons in lattice QCD. Considering in particular the example of the static Bs form factors we…Felix Bahr, Debasish Banerjee, Fabio Bernardoni et al.·Jan 17, 2016SaveLearn
Strongly interacting dynamics and the search for new physics at the LHCWe present results for the spectrum of a strongly interacting SU(3) gauge theory with Nf = 8 light fermions in the fundamental representation. Carrying out non-perturbative lattice calculations at…Thomas Appelquist, Richard C. Brower, George T. Fleming et al.·Jan 15, 2016SaveLearn
Aspects of topological actions on the latticeWe consider a lattice action which forbids large fields, and which remains invariant under smooth deformations of the field. Such a "topological" action depends on one parameter, the field…Oscar Akerlund, Philippe de Forcrand·Jan 15, 2016SaveLearn
Electroweak interactions and dark baryons in the sextet BSM model with a composite Higgs particleThe Electroweak interactions of a strongly coupled gauge theory are discussed with outlook beyond the Standard Model (BSM) under global and gauge anomaly constraints. The theory is built on a minimal…Zoltan Fodor, Kieran Holland, Julius Kuti et al.·Jan 13, 2016SaveLearn
Multiple right-hand-side setup for the DD-αAMGThe setup cost of a modern solver such as DD-αAMG (Wuppertal Multigrid) is a significant contribution to the total time spent on solving the Dirac equation, and in HMC it can even be dominant. We…Daniel Richtmann, Simon Heybrock, Tilo Wettig·Jan 13, 2016SaveLearn