Determination of baryon magnetic moments from QCD sum rules

Chiu, Charles B. ; Pasupathy, J. ; Wilson, Sanford J. (1986) Determination of baryon magnetic moments from QCD sum rules Physical Review D - Particles, Fields, Gravitation and Cosmology, 33 (7). pp. 1961-1973. ISSN 1550-7998

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The magnetic moment μ B of a baryon B with quark content (aab) is written as μ B=4ea(1+δ B)eh/2cMB, where ea is the charge of the quark of flavor type a. The experimental values of δ B have a simple pattern and have a natural explanation within QCD. Using the ratio method, the QCD sum rules are analyzed and the values of δB are computed. We find good agreement with data (Λ 10%) for the nucleons and the Σ multiplet while for the cascade the agreement is not as good. In our analysis we have incorporated additional terms in the operator-product expansion as compared to previous authors. We also clarify some points of disagreement between the previous authors. External-field-induced correlations describing the magnetic properties of the vacuum are estimated from the baryon magnetic-moment sum rules themselves as well as by independent spectral representations and the results are contrasted.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:58069
Deposited On:31 Aug 2011 12:38
Last Modified:31 Aug 2011 12:38

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