The strange quark mass from finite energy sum rules
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文摘
The strange quark mass is determined from a study of the correlator 
0
T(JsJ†s)0
(where Js≡∂μsγμu, the divergence of the strange vector current) using a family of finite energy sum rules recently shown to be very accurately satisfied in the isovector vector channel. It is shown that the match between the OPE and hadronic representations for the sum rules employed is extremely good once one fixes the overall scale, (ms−mu)2, which normalizes the OPE side. A value ms(4GeV2)=115±8MeV, corresponding to ms(1GeV2)=159±11MeV, is obtained, with theoretical and experimental uncertainties contributing roughly equally to the combined error.
0T(JsJ†s)0 (where Js≡∂μsγμu, the divergence of the strange vector current) using a family of finite energy sum rules recently shown to be very accurately satisfied in the isovector vector channel. It is shown that the match between the OPE and hadronic representations for the sum rules employed is extremely good once one fixes the overall scale, (ms−mu)2, which normalizes the OPE side. A value ms(4GeV2)=115±8MeV, corresponding to ms(1GeV2)=159±11MeV, is obtained, with theoretical and experimental uncertainties contributing roughly equally to the combined error.