Drell-Yan Lepton Pair Azimuthal Asymmetry in Hadronic Processes
We study the azimuthal asymmetry in the Drell-Yan lepton pair production in hadronic scattering processes at moderate transverse momentum region, taking into account the contributions from the twist-three quark-gluon correlations from the unpolarized hadrons. The contributions are found to dominate the asymmetry, and are not power suppressed by qt/Q at small qt where qt and Q are the transverse momentum and invariant mass of the lepton pair. Accordingly, the Lam-Tung relation will be violated at this momentum region, and its violation depends on the twist-three functions. However, at large transverse momentum qt~;;Q, the Lam-Tung relation still holds because all corrections are power suppressed by Lambda2/qt2 ~;; Lambda2/Q2 where Lambda is the typical nonperturbative scale.
- Research Organization:
- Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
- Sponsoring Organization:
- Nuclear Science Division
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 948039
- Report Number(s):
- LBNL-1464E
- Journal Information:
- Physical Review, Journal Name: Physical Review
- Country of Publication:
- United States
- Language:
- English
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