Endpoint logarithms in e +e -→ J/π +η c

Geoffrey T. Bodwin, Hee Sok Chung, Jungil Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We investigate the origin of the double logarithms of Q 2/m c 2 that appear in the calculation of the cross section for e +e - → J/π +η c at next-to-leading order in the strong coupling α s. Here, Q 2 is the square of the center-of-momentum energy, and mc is the charm-quark mass. We find that, diagram-by-diagram, the double logarithms are accounted for by Sudakov double logarithms and endpoint double logarithms. The Sudakov double logarithms cancel in the sum over all diagrams, but the endpoint double logarithms do not. We reinterpret the endpoint double logarithms in terms of a leading region of loop integration in which a spectator fermion line becomes soft and collinear. This reinterpretation may simplify the process of establishing an all-orders factorization theorem for this helicity-flip process, which, in turn, might allow one to resum logarithms of Q 2/m c 2 to all orders in α s. Copyright owned by the author(s).

Original languageEnglish
Title of host publicationProceedings of Science
Publication statusPublished - 2012
Event10th Conference on Quark Confinement and the Hadron Spectrum, Confinement 2012 - Munich, Germany
Duration: 2012 Oct 82012 Oct 12

Other

Other10th Conference on Quark Confinement and the Hadron Spectrum, Confinement 2012
CountryGermany
CityMunich
Period12/10/812/10/12

ASJC Scopus subject areas

  • General

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    Bodwin, G. T., Chung, H. S., & Lee, J. (2012). Endpoint logarithms in e +e -→ J/π +η c In Proceedings of Science