Excited isovector mesons using the stochastic LapH method

The spectrum of excited isovector mesons is studied using a 32^3 x 256 anisotropic lattice with u,d quark masses set to give a pion mass near 240 MeV. Results in the bosonic isovector nonstrange symmetry channels of zero total momentum are presented using correlation matrices of unprecedented size....

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Bibliographic Details
Published inarXiv.org
Main Authors Morningstar, Colin, Fahy, Brendan, You-Cyuan Jhang, Juge, Keisuke J, Lenkner, David, Wong, Chik Him
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 31.10.2014
Subjects
Excitation spectra
Galling
Lattice vibration
Mathematical analysis
Matrix methods
Mesons
Operators
Propagation modes
Quarks
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Summary:The spectrum of excited isovector mesons is studied using a 32^3 x 256 anisotropic lattice with u,d quark masses set to give a pion mass near 240 MeV. Results in the bosonic isovector nonstrange symmetry channels of zero total momentum are presented using correlation matrices of unprecedented size. In addition to spatially-extended single-meson operators, large numbers of two-meson operators are used, involving a wide variety of light isovector, isoscalar, and strange meson operators of varying relative momenta. All needed Wick contractions are efficiently evaluated using a stochastic method of treating the low-lying modes of quark propagation that exploits Laplacian Heaviside quark-field smearing. Level identification is discussed.
ISSN:2331-8422