η′ Meson Mass in Lattice QCD | Zendy

Y. Kuramashi | Zendy; M. Fukugita | Zendy; H. Mino | Zendy; M. Okawa | Zendy; A. Ukawa | Zendy

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η′ Meson Mass in Lattice QCD

Author(s) -

Y. Kuramashi,

M. Fukugita,

H. Mino,

M. Okawa,

A. Ukawa

Publication year - 1994

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.72.3448

Subject(s) - physics , particle physics , lattice qcd , meson , quenched approximation , quantum chromodynamics , pseudoscalar , lattice (music) , pseudoscalar meson , quark , lattice field theory , octet , nuclear physics , acoustics

It is shown that the mass difference between η′ and pseudoscalar octet mesons can be calculated in quenched lattice QCD with the aid of a variant wall source technique. The estimated mass difference increases as the quark mass decreases, and its value extrapolated to the zero-quark-mass limit. mη′2-m82=(750±40 MeV)2, is close to the value determined from experiment (850 MeV)2. These results indicate that the long-standing U(1) problem could be solved in lattice QCD, with its essential part being understood within the quenched approximation. We also comment on implications of our results on spurious infrared divergences in quenched QCD

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