ar X iv : h ep - l at / 0 21 10 41 v 1 2 7 N ov 2 00 2 1 Results for the η ′ Mass from Two - Flavor Lattice QCD
نویسندگان
چکیده
We present results for the mass of the η ′ meson for two-flavor lattice QCD in the continuum limit, calculated on the CP-PACS computer, using an RG-improved gauge action and clover fermion action with tadpole-improved csw. Measurements are made at three couplings corresponding to a ≈ 0.22, 0.16, 0.11 fm for four quark masses corresponding to mπ/mρ ≈ 0.8, 0.75, 0.7, 0.6. The two-loop diagrams are evaluated using a noisy source method. Quark smearing for both one-and two-loop diagrams is successfully applied to obtain ground state signals in the η ′ channel. We obtain m η ′ =0.960(87) +0.036 −0.286 GeV in the continuum limit, where the second error represents the systematic uncertainty coming from varying the functional form for chiral and continuum extrapolations.
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