Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-06-07
Phys.Rev. D55 (1997) 2644-2649; Erratum-ibid. D56 (1997) 3159
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 3 ps-figures, uses RevTeX. Abstract, Sec. II, III and IV have been expanded
Scientific paper
10.1103/PhysRevD.55.2644
We analyse the baryon magnetic moments in a model that relates them to the parton spins $\Delta u$, $\Delta d$, $\Delta s$, and includes a contribution from orbital angular momentum. The specific assumption is the existence of a 3-quark correlation (such as a flux string) that rotates with angular momentum $\langle L_z \rangle$ around the proton spin axis. A fit to the baryon magnetic moments, constrained by the measured values of the axial vector coupling constants $a^{(3)}=F+D$, $a^{(8)}=3F-D$, yields $\langle S_z \rangle = 0.08 \pm 0.13$, $\langle L_z \rangle = 0.39 \pm 0.09$, where the error is a theoretical estimate. A second fit, under slightly different assumptions, gives $\langle L_z \rangle = 0.37 \pm 0.09$, with no constraint on $\langle S_z \rangle$. The model provides a consistent description of axial vector couplings, magnetic moments and the quark polarization $\langle S_z \rangle$ measured in deep inelastic scattering. The fits suggest that a significant part of the angular momentum of the proton may reside in a collective rotation of the constituent quarks.
Casu Massimo
Sehgal Lalit M.
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