Drell-Yan Massive Lepton-Pair's Angular Distributions at Large $Q_T$

Details Drell-Yan Massive Lepton-Pair's Angular Distributions at Large $Q_T$ Drell-Yan Massive Lepton-Pair's Angular Distributions at Large $Q_T$

2001-02-15

arxiv.org/abs/hep-ph/0102198v1

Phys.Lett.B506:254-260,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 10 pages including 4 figures

Scientific paper

10.1016/S0370-2693(01)00360-4

By measuring Drell-Yan massive lepton-pair's angular distributions, we can identify the polarization of the virtual photon of invariant mass $Q$ which decays immediately into the lepton-pair. In terms of a modified QCD factorization formula for Drell-Yan process, which is valid even if $Q_T\gg Q$, we calculate the massive lepton-pair's angular distributions at large $Q_T$. We find that the virtual photons produced at high $Q_T$ are more likely to be transversely polarized. We discuss the implications of this finding to the J/$\psi$ mesons' polarization measured recently at Fermilab.

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