Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-04-22
Phys.Lett. B333 (1994) 526-530
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages in Latex with 3 figures appended as Postscript files, HU-TFT-94-12, LBL-35430. (The introductory part has been slightl
Scientific paper
10.1016/0370-2693(94)90178-3
We study the Drell-Yan process $\pi N \rightarrow \mu^+ \mu^- X$ at large $x_F$ using perturbative QCD. A higher-twist mechanism suggested by Berger and Brodsky is known to qualitatively explain the observed $x_F$ dependence of the muon angular distribution, but the predicted large $x_F$ behavior differs quantitatively from observations. We have repeated the model calculation taking into account the effects of nonasymptotic kinematics. At fixed-target energies we find important corrections which improve the agreement with data. The asymptotic result of Berger and Brodsky is recovered only at much higher energies. We discuss the generic reasons for the large corrections at high $x_F$. A proper understanding of the $x_F \to 1$ data would give important information on the pion distribution amplitude and exclusive form factor.
Eskola Kari. J.
Hoyer Paul
Vänttinen M.
Vogt Rainer
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