Abstract
We show that instanton-anti-instanton pairs generate an anomalous contribution to the matrix element of the isosinglet axial current in a polarized proton. We compute this contribution for a polarized quark propagating in an instanton vacuum, and we show that for N1 = 1 it exactly cancels the axial charge of the quark. We show that the anomalous contribution is always anticorrelated to the canonical contribution from current quark polarization, regardless of the details of the quark wave function and instanton density. This may explain the experimentally observed suppression of the first moment of the polarized structure function g1.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
