Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-04-15
Nucl.Phys. A622 (1997) 538-552
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, Latex, no figures
Scientific paper
10.1016/S0375-9474(97)80698-7
Quantum effects inside the chiral bag induce a color anomaly which requires a compensating surface term to prevent breakdown of color gauge invariance. We show that the presence of this surface term first discovered several years ago allows one to derive in a gauge-invariant way a chiral-bag version of the Shore-Veneziano two-component formula for the flavor-singlet axial charge of the proton. This has relevance to what is referred to as the ``proton spin problem" on the one hand and to the Cheshire-Cat phenomenon in hadron structure on the other. We show that when calculated to the leading order in the color gauge coupling and for a specific color electric monopole configuration in the bag, one can obtain a striking Cheshire-Cat phenomenon with a negligibly small singlet axial charge.
Rho Mannque
Vento Vicente
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