Non-leptonic kaon decays at large NcWe study the scaling with the number of colors Nc of the weak amplitudes mediating kaon mixing and decay, in the limit of light charm masses (mu=md=ms=mc). The amplitudes are extracted…Andrea Donini, Pilar Hernandez, Carlos Pena et al.·Nov 28, 2017SaveLearn
Lattice QCD investigation of the structure of the a0(980) mesonWe investigate the quark content of the scalar meson a0(980) using lattice QCD. To this end we consider correlation functions of six different two- and four-quark interpolating fields. We evaluate…Constantia Alexandrou, Joshua Berlin, Mattia Dalla Brida et al.·Nov 27, 2017SaveLearn
New methods for B meson decay constants and form factors from lattice NRQCDWe determine the normalisation of scalar and pseudoscalar current operators made from non-relativistic b quarks and Highly Improved Staggered light quarks in lattice Quantum Chromodynamics (QCD)…C. Hughes, C. T. H. Davies, C. J. Monahan·Nov 27, 2017SaveLearn
Chiral Symmetry and hadron properties at finite temperature -A numerical experimentWe study the hadron properties at finite temperature from measurement of the screening masses, using two-flavor full QCD of the hybrid Monte Carlo (HMC) algorithm with the renormalization group…Teiji Kunihiro, Shin Muroya, Atsushi Nakamura et al.·Nov 27, 2017SaveLearn
Comment on "Relation between scattering amplitude and Bethe-Salpeter wave function in quantum field theory"We invalidate the arguments given in [T.Yamazaki and Y.Kuramashi, Phys. Rev. D96, 114511 (2017)] over the HAL QCD method for hadron-hadron interactions on the lattice. We also pose questions on the…Sinya Aoki, Takumi Doi, Tetsuo Hatsuda et al.·Nov 26, 2017SaveLearn
Including electromagnetism in Kππ decay calculationsBecause of the small size of the ratio A2/A0 of the I=2 to I=0 K -> pipi decay amplitudes (the Delta I=1/2 rule) the effects of electromagnetism on A2 may be a factor of 20 larger than given by a…Norman Christ, Xu Feng·Nov 26, 2017SaveLearn
Axial U(1) symmetry at high temperature in 2-flavor lattice QCDWe investigate the axial U(1)A symmetry breaking above the critical temperature in two-flavor lattice QCD. The ensembles are generated with dynamical Möbius domain-wall or reweighted overlap…Kei Suzuki, Sinya Aoki, Yasumichi Aoki et al.·Nov 25, 2017SaveLearn
Tetraquark resonances computed with static lattice QCD potentials and scattering theoryWe study tetraquark resonances with lattice QCD potentials computed for two static quarks and two dynamical quarks, the Born-Oppenheimer approximation and the emergent wave method of scattering…Pedro Bicudo, Marco Cardoso, Antje Peters et al.·Nov 23, 2017SaveLearn
Landau levels in QCD in an external magnetic fieldWe will discuss the issue of Landau levels of quarks in lattice QCD in an external magnetic field. We will show that in the two-dimensional case the lowest Landau level can be identified…Falk Bruckmann, Gergely Endrodi, Matteo Giordano et al.·Nov 23, 2017SaveLearn
Leptonic decay constants for D-mesons from 3-flavour CLS ensemblesWe report on the status of an ongoing effort by the RQCD and ALPHA Collaborations, aimed at determining leptonic decay constants of charmed mesons. Our analysis is based on large-volume ensembles…Sara Collins, Kevin Eckert, Jochen Heitger et al.·Nov 23, 2017SaveLearn
Calculation of fermionic Green functions with Grassmann higher-order tensor renormalization groupWe develop calculational method for fermionic Green functions in the framework of Grassmann higher-order tensor renormalization group. The validity of the method is tested by applying it to…Yusuke Yoshimura, Yoshinobu Kuramashi, Yoshifumi Nakamura et al.·Nov 22, 2017SaveLearn
Bs K ν form factors with 2+1 flavorsUsing the MILC 2+1 flavor asqtad quark action ensembles, we are calculating the form factors f0 and f+ for the semileptonic Bs → K ν decay. A total of six ensembles with…Fermilab Lattice, MILC Collaborations, : et al.·Nov 21, 2017SaveLearn
Benchmark results in the 2D lattice Thirring model with a chemical potentialWe study the two dimensional lattice Thirring model in the presence of a fermion chemical po- tential. Our model is asymptotically free, contains massive fermions that mimic a baryon and light bosons…Venkitesh Ayyar, Shailesh Chandrasekharan, Jarno Rantaharju·Nov 21, 2017SaveLearn
Topological Susceptibility in Nf=2 QCD at Finite TemperatureWe study the topological charge in Nf=2 QCD at finite temperature using Möbius domain-wall fermions. The susceptibility χt of the topological charge defined either by the index of overlap Dirac…S. Aoki, Y. Aoki, G. Cossu et al.·Nov 20, 2017SaveLearn
Single flavour filtering for RHMC in BQCDFiltering algorithms for two degenerate quark flavours have advanced to the point that, in 2+1 flavour simulations, the cost of the strange quark is significant compared with the light quarks. This…Waseem Kamleh, Taylor Haar, Yoshifumi Nakamura et al.·Nov 20, 2017SaveLearn
Background field Landau mode operators for the nucleonThe introduction of a uniform background magnetic field breaks three-dimensional spatial symmetry for a charged particle and introduces Landau mode effects. Standard quark operators are inefficient…Waseem Kamleh, Ryan Bignell, Derek B. Leinweber et al.·Nov 20, 2017SaveLearn
Baryon interactions from lattice QCD with physical masses --- strangeness S=-1 sector ---We present our recent results of baryon interactions with strangeness S=-1 based on Nambu-Bethe-Salpeter (NBS) correlation functions calculated from lattice QCD with almost physical quark masses…Hidekatsu Nemura, Sinya Aoki, Takumi Doi et al.·Nov 19, 2017SaveLearn
First lattice calculation of the QED corrections to leptonic decay ratesThe leading-order electromagnetic and strong isospin-breaking corrections to the ratio of Kμ2 and πμ2 decay rates are evaluated for the first time on the lattice, following a method…D. Giusti, V. Lubicz, G. Martinelli et al.·Nov 17, 2017SaveLearn
Electromagnetic Form Factors of Nucleon Excitations in Lattice QCDVariational analysis techniques in lattice QCD are powerful tools that give access to the full spectrum of QCD. At zero momentum, these techniques are well established and can cleanly isolate energy…Finn M. Stokes, Waseem Kamleh, Derek B. Leinweber et al.·Nov 16, 2017SaveLearn
Nπ scattering in the Roper channelWe present results from our recent lattice QCD study of Nπ scattering in the positive-parity nucleon channel, where the puzzling Roper resonance N*(1440) resides in experiment. Using a variety…M. Padmanath, C. B. Lang, Luka Leskovec et al.·Nov 16, 2017SaveLearn
SU(2NF) symmetry of confinement in QCD and its observation at high temperatureIn this talk we first overview lattice results that have led to the observation of new SU(2)CS and SU(2NF) symmetries upon artificial truncation of the near-zero modes of the Dirac operator at…L. Ya. Glozman·Nov 16, 2017SaveLearn
A tmQCD mixed-action approach to flavour physicsWe discuss a mixed-action approach in which sea quarks are regularised using non-perturbatively O(a) improved Wilson fermions, while a fully-twisted tmQCD action is used for valence quarks.…Gregorio Herdoíza, Carlos Pena, David Preti et al.·Nov 16, 2017SaveLearn
A complex path around the sign problemWe review recent attempts at dealing with the sign problem in Monte Carlo calculations by deforming the region of integration in the path integral from real to complex fields. We discuss the…Paulo F. Bedaque·Nov 16, 2017SaveLearn
The QCD chiral phase transition from non-integer numbers of flavorsAttempts to extract the order of the chiral transition of QCD at zero chemical potential, with two dynamical flavors of massless quarks, from simulations with progressively decreasing pion mass have…Francesca Cuteri, Owe Philipsen, Alessandro Sciarra·Nov 15, 2017SaveLearn
Towards a non-perturbative calculation of Weak Hamiltonian Wilson coefficientsWe propose a method to compute the Wilson coefficients of the weak effective Hamiltonian to all orders in the strong coupling constant using Lattice QCD simulations. We perform our calculations…Mattia Bruno, Christoph Lehner, Amarjit Soni·Nov 15, 2017SaveLearn