Light hadrons with improved staggered quarks: Approaching the continuum limit

By C. Aubin, C. Bernard, C. DeTar, J. Osborn, S. Gottlieb, E. Gregory, D. Toussaint, U. Heller, J. Hetrick, R. Sugar. 2004

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We have extended our program of QCD simulations with an improved Kogut-Susskind quark action to a smaller lattice spacing, approximately 0.09 fm. Also, the simulations with a{approx_equal}0.12 fm have been extended to smaller quark masses. In this paper we describe the new simulations and computations of the static quark potential and light hadron spectrum. These results give information about the remaining dependences on the lattice spacing. We examine the dependence of computed quantities on the spatial size of the lattice, on the numerical precision in the computations, and on the step size used in the numerical integrations. We examine the effects of autocorrelations in 'simulation time' on the potential and spectrum. We see possible effects of decays, or coupling to two-meson states in the 0{sup ++} and 1{sup +} meson propagators. A state consistent with {pi}+K is seen as a 'parity partner' in the Goldstone kaon propagator, and we make a preliminary mass computation for a radially excited 0{sup -} meson.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/22b64e407c6a9e01cf5c5a2bb1e896baa27df046

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Citations in the corpus

Flavor Physics in the Quark Sector (2009, methodology): “3, and many quoted in the rest of this report, have been obtained with staggered sea quarks [92,93], which provide the least computationally demanding method for computing detM [94].”
Is there still any Tc mystery in lattice QCD? Results with physical masses in the continuum limit III (2010, result): “We find an agreement between our data and the HRG ones with “physical” masses, while the hotQCD collaboration results are in agreement with the HRG model only if the spectrum is “distorted” as it was directly measured on the lattice [24, 36, 37].”
Nonperturbative QCD Simulations with 2+1 Flavors of Improved Staggered Quarks (2009, background): “…of thea0 channel in the staggered fermion formulation a peculiarity was encountered: it was found that on coarse lattices thea0 correlator appeared to have a spectral contribution with an anomalously low mass, lighter than any physical decay channel (Aubin et al., 2004a; Gregoryet al., 2006).”
The equation of state in lattice QCD: with physical quark masses towards the continuum limit (2005, background): “(This part of the potentials is theoretically sound [15] and it has been studied in the continuum limit [16]).”
Nonstandard heavy mesons and baryons: Experimental evidence (2017, background): “9 The LQCD hadron spectrum from MILC (163; 164), PACS-CS (165), BMW (166), QCDSF (162), RBC & UKQCD (167), Hadron Spectrum (168), UKQCD (169), FermilabMILC (170), HPQCD (171), and Mohler & Woloshyn (172).”