Drell-Yan Lepton Pair Azimuthal Asymmetry in Hadronic Processes

Abstract

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 q_\perp/Q at small q_\perp where q_\perp 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 q_\perp\sim Q, the Lam-Tung relation still holds because all corrections are power suppressed by Λ^2/q_\perp^2\sim Λ^2/Q^2 where Λis the typical nonperturbative scale.

10 pages, 1 figure

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• Boer-Mulders effect in the unpolarized pion induced Drell-Yan process at COMPASS within TMD factorization
• On the process dependent nuclear $k_{\perp }$ broadening effect
• Transverse single spin asymmetry in Drell-Yan production in polarized pA collisions
• Transverse single spin asymmetry in the Drell-Yan process
• Color entanglement effect in collinear twist-3 factorization
• Azimuthal asymmetry in SIDIS off nuclei as probe for $\hat{q}$
• $\pi -N$ Drell-Yan process in TMD factorization
• Glauber gluons in pion-induced Drell-Yan processes revisited
• Transverse momentum dependent quark distributions and polarized Drell-Yan processes