Fragmentation functions for lepton pairs

Eric Braaten, Jungil Lee

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

We calculate the fragmentation function for a light quark to decay into a lepton pair to leading order in the QCD coupling constant. In the formal definition of the fragmentation function, a QED phase must be included in the eikonal factor to guarantee QED gauge invariance. We find that the longitudinal polarization fraction is a decreasing function of the factorization scale, in accord with the intuitive expectation that the virtual photon should behave more and more like a real photon as the transverse momentum of the fragmenting quark increases.

Original languageEnglish
Article number034005
JournalPhysical Review D
Volume65
Issue number3
DOIs
Publication statusPublished - 2002
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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