出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We study spin 1
2 hadronic states in quenched lattice QCD to search for a possible S = +1 pentaquark
resonance. Our work is the first systematic lattice QCD study which properly carries out
the following analyses: (1) the careful extraction of the first two low energy states with very high
statistics and the variational method and (2) the study of volume dependences of eigenenergies
and spectral weights to distinguish resonance states from scattering states.
Simulations are carried out on 83×24, 103×24, 123×24 and 163×24 lattices at b =5.7 with the
standard plaquette gauge action and theWilson quark action. Our result indicates the existence of
a resonance state lying slightly above the NK threshold in (I,JP) = (0, 1
2
−
) channel in quenched
QCD.
