Color anomaly and flavor-singlet axial charge of the proton in the chiral bag: The Cheshire Cat revisited

✍ Scribed by Mannque Rho; Vicente Vento

• Book ID: 104336759
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 698 KB
• Volume: 622
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(97)80698-7

✦ Synopsis

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. (~) 1997 Published by Elsevier Science B.V.