Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2002-11-26
Phys.Rev.D67:074503,2003
Physics
High Energy Physics
High Energy Physics - Lattice
9 pages, 19 figures, 4 tables
Scientific paper
10.1103/PhysRevD.67.074503
We present results for the mass of the eta-prime meson in the continuum limit for two-flavor lattice QCD, calculated on the CP-PACS computer, using a renormalization-group improved gauge action, and Sheikholeslami and Wohlert's fermion action with tadpole-improved csw. Correlation functions are measured at three values of the coupling constant beta corresponding to the lattice spacing a approx. 0.22, 0.16, 0.11 fm and for four values of the quark mass parameter kappa corresponding to mpi over mrho approx. 0.8, 0.75, 0.7 and 0.6. For each beta, kappa pair, 400-800 gauge configurations are used. The two-loop diagrams are evaluated using a noisy source method. We calculate eta-prime propagators using local sources, and find that excited state contributions are much reduced by smearing. A full analysis for the smeared propagators gives metaprime=0.960(87)+0.036-0.248 GeV, in the continuum limit, where the second error represents the systematic uncertainty coming from varying the functional form for chiral and continuum extrapolations.
Aoki Sadao
Burkhalter Rudolf
Fukugita Masaaka
Ishikawa Kei-Ichi
Ishizuka Naruhito
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