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Transition magnetic moment of Λ→Σ0\Lambda \to \Sigma^0 in QCD sum rules

Feb, 2011
9 pages
Published in:
  • Phys.Rev.D 83 (2011) 094008
e-Print:
DOI:
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Abstract: (arXiv)
The Λ\Lambda →\to Σ0\Sigma^0 transition magnetic moment is computed in the QCD sum rules approach. Three independent tensor structures are derived in the external field method using generalized interpolating fields. They are analyzed together with the Λ\Lambda and Σ0\Sigma^0 mass sum rules using a Monte-Carlo-based analysis, with attention to OPE convergence, ground-state dominance, and the role of the transitions in the intermediate states. Relations between sum rules for magnetic moments of Λ\Lambda and Σ0\Sigma^0 and sum rules for transition magnetic moment of Λ\Lambda →\to Σ0\Sigma^0 are also examined. Our best prediction for the transition magnetic moment is μΣ0Λ=1.60±0.07  μN\mu_{\Sigma^0\Lambda}= 1.60\pm 0.07\; \mu_N. A comparison is made with other calculations in the literature.
Note:
  • 9 pages, 4 figures, 2 tables. Typos corrected
  • 13.40.Em
  • 12.38.-t
  • 14.20.Jn
  • magnetic moment: transition
  • quantum chromodynamics: sum rule
  • external field
  • hyperon: magnetic moment
  • Lambda
  • Sigma0
  • hyperon: mass
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