Fragmentation Functions for Lepton Pairs

Details Fragmentation Functions for Lepton Pairs Fragmentation Functions for Lepton Pairs

2001-02-11

arxiv.org/abs/hep-ph/0102130v2

Phys.Rev. D65 (2002) 034005

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 4 figures, normalization corrected, text abbreviated

Scientific paper

10.1103/PhysRevD.65.034005

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 momomentum of the fragmenting quark increases.

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