Isospin violation in QCD sum rules for baryons

Adami, C.; Drukarev, E.G.; Ioffe, B.L.

doi:10.1103/PhysRevD.48.2304

Isospin violation in QCD sum rules for baryons

C. Adami
(
- Caltech, Kellogg Lab
)
,
E.G. Drukarev
(
- St. Petersburg, INP
)
,
B.L. Ioffe
(
- Moscow, ITEP
)

Jan, 1993

23 pages

Published in:

Phys.Rev.D 48 (1993) 2304,
Phys.Rev.D 52 (1995) 4254 (erratum)

DOI:

Report number:

ITEP-7-93

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Abstract: (APS)

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|u¯u−d¯d|0〉〈0|u¯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 μ¯=0.5 GeV) is also determined.

quantum chromodynamics: sum rule
isospin: symmetry breaking
symmetry breaking: isospin
quark: condensation
baryon: mass spectrum
mass spectrum: baryon
nucleon: mass
mass: nucleon
Sigma: mass
mass: Sigma

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