Phys. Rev. D 48, 2304 - 2312 (1993)Isospin violation in QCD sum rules for baryons |
C. Adami
W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125
E. G. Drukarev
St. Petersburg Nuclear Physics Institute, Gatchina, 188 350 St. Petersburg, Russia
B. L. Ioffe
Institute of Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117 259 Moscow, Russia
See Also: Erratum
Received 8 February 1993
We thoroughly analyze isospin-violating effects in QCD sum rules for the masses of nucleons, Σ, and Ξ hyperons. After comparing with experimental mass splittings in isotopic multiplets, we obtain for the isospin breaking in the quark condensate 〈0|u̅ u-d̅ d|0〉 / 〈0|u̅ u|0〉=(2±1)×10-3, a value significantly smaller than the one usually adopted. We present arguments in favor of our result and critically analyze previous estimates. The value of the quark mass difference md-mu=3.0±1.0 MeV (at normalization point μ̅ =0.5 GeV) is also determined.
©1993 The American Physical Society
URL: http://link.aps.org/abstract/PRD/v48/p2304
DOI: 10.1103/PhysRevD.48.2304
PACS: 11.50.Li, 11.30.Hv, 14.20.Dh
See Also
Erratum: C. Adami, E. G. Drukarev, and B. L. Ioffe, Erratum: Isospin violation in QCD sum rules for baryons [Phys. Rev. D 48, 2304 (1993)], Phys. Rev. D 52, 4254 (1995)
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