Toward the excited isoscalar meson spectrum from lattice QCD

Sep 10, 2013
19 pages
Published in:
  • Phys.Rev.D 88 (2013) 9, 094505
  • Published: Nov 18, 2013
e-Print:
Report number:
  • JLAB-THY-13-1786,
  • TCDMATH-13-11

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Abstract: (APS)
We report on the extraction of an excited spectrum of isoscalar mesons using lattice QCD. Calculations on several lattice volumes are performed with a range of light quark masses corresponding to pion masses down to ∼400  MeV. The distillation method enables us to evaluate the required disconnected contributions with high statistical precision for a large number of meson interpolating fields. We find relatively little mixing between 12(uu¯+dd¯) and ss¯ in most JPC channels; one notable exception is the pseudoscalar sector where the approximate SU(3)F octet, singlet structure of the η, η′ is reproduced. We extract exotic JPC states, identified as hybrid mesons in which an excited gluonic field is coupled to a color-octet qq¯ pair, along with nonexotic hybrid mesons embedded in a qq¯-like spectrum.
  • 12.38.Gc
  • 14.40.Be
  • 14.40.Rt
  • meson: isoscalar
  • meson: hybrid
  • SU(3): octet
  • quark: mass dependence
  • pi: mass
  • lattice field theory
  • quantum chromodynamics