Bethe-Salpeter qqq dynamics: electromagnetic properties of baryons

Mitra, A. N. ; Mittal, Anuradha (1984) Bethe-Salpeter qqq dynamics: electromagnetic properties of baryons Physical Review D - Particles, Fields, Gravitation and Cosmology, 29 (7). pp. 1399-1407. ISSN 1550-7998

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Official URL: http://link.aps.org/doi/10.1103/PhysRevD.29.1399

Related URL: http://dx.doi.org/10.1103/PhysRevD.29.1399

Abstract

The Bethe-Salpeter model for qq̅ and qqq systems under harmonic confinement, previously found to fit the qq̅ and qqq mass spectra of light (u,d,s) quarks rather well with a universal spring constant (ω = 0.15 GeV) and the concerned quark mass (mud = 0.28 GeV, ms = 0.35 GeV) is employed to predict some crucial electromagnetic properties of baryons as a generalization of a similar method recently developed for the electromagnetic interaction of qq̅ mesons. The major successes, in which the relativistic features of the model have played a crucial role, are in respect of magnetic moments of baryons and the charge radius of the proton, all in very good agreement with experiment with no free parameters. In particular, μp=2.796 (2.793) nuclear magnetons and <rp2>1/2=0.86 (0.87) fm. The helicity amplitudes A3/2 and A1/2 for Δ→Nγ also reveal an improved fit to data over previous quark-model calculations. The significance of these results is discussed in relation to contemporary confinement models.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:35099
Deposited On:09 Apr 2011 07:44
Last Modified:09 Apr 2011 07:44

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