Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-11-11
Nucl.Phys.Proc.Suppl. 116 (2003) 202-206
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 15 figures, talk presented at RADCOR 2002 and Loops and Legs 2002, Kloster Banz (Germany), September 8 to 13, 2002, t
Scientific paper
10.1016/S0920-5632(03)80170-6
The lepton helicity distributions in the polarized Drell-Yan process at RHIC energy are investigated. In the absence of the weak interaction, only the measurement of lepton helicity can prove the antisymmetric part of the hadronic tensor. Therefore it might be interesting to consider the helicity distributions of leptons to obtain more information on the structure of nucleon from the polarized Drell-Yan process. We estimate the QCD corrections at ${\cal O} (\alpha_s)$ level to the hadronic tensor including both intermediate $\gamma$ and $Z$ bosons. We report the numerical analyses on the $Z$ pole and show that the $u (\bar{u})$ and $d (\bar{d})$ quarks give different and characteristic contributions to the lepton helicity distributions. We also estimate the lepton helicity asymmetry for the various proton's spin configurations.
Kodaira Jiro
Yokoya Hiroshi
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