Formalism for dilepton production via virtual photon bremsstrahlung in hadronic reactions
Abstract
We derive a set of new formulas for various distributions in dilepton production via virtual photon bremsstrahlung from pseudoscalar mesons and unpolarized spin-one-half fermions. These formulas correspond to the leading and sub-leading terms in the Low-Burnett-Kroll expansion for real photon bremsstrahlung. The relation of our leading-term formulas to previous works is also shown. Existing formulas are examined in the light of Lorentz covariance and gauge invariance. Numerical comparison is made in a simple example, where an "exact" formula and real photon data exist. The results reveal large discrepancies among different bremsstrahlung formulas. Of all the leading-term bremsstrahlung formulas, the one derived in this work agrees best with the exact formula. The issues of M_T-scaling and event generators are also addressed.
Keywords
Cite
@article{arxiv.hep-ph/9812211,
title = {Formalism for dilepton production via virtual photon bremsstrahlung in hadronic reactions},
author = {Peter Lichard},
journal= {arXiv preprint arXiv:hep-ph/9812211},
year = {2009}
}
Comments
37 pages, RevTeX, epsf.sty, 10 embedded figures