Drell-Yan Lepton Pair Azimuthal Asymmetry in Hadronic Processes

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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 ... continued below

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Zhou, Jian; Yuan, Feng & Liang, Zuo-Tang January 22, 2009.

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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.

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  • Journal Name: Physical Review

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  • Report No.: LBNL-1464E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 948039
  • Archival Resource Key: ark:/67531/metadc897830

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  • January 22, 2009

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 3, 2016, 1:47 p.m.

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Zhou, Jian; Yuan, Feng & Liang, Zuo-Tang. Drell-Yan Lepton Pair Azimuthal Asymmetry in Hadronic Processes, article, January 22, 2009; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc897830/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.