Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-12-31
Phys.Rev. D64 (2001) 074007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 19 pages including 6 figures. An error in the first version has been corrected, and references updated
Scientific paper
10.1103/PhysRevD.64.074007
We introduce operator definitions for virtual photon fragmentation functions, which are needed for reliable calculations of Drell-Yan transverse momentum ($Q_T$) distributions when $Q_T$ is much larger than the invariant mass $Q$. We derive the evolution equations for these fragmentation functions. We calculate the leading order evolution kernels for partons to fragment into a unpolarized as well as a polarized virtual photon. We find that fragmentation functions to a longitudinally polarized virtual photon are most important at small $z$, and the fragmentation functions to a transversely polarized virtual photon dominate the large $z$ region. We discuss the implications of this finding to the J/$\psi$ mesons' polarization at large transverse momentum.
Qiu Jianwei
Zhang Xiaofei
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