Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-06-28
Phys.Rev.D76:074032,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
V1: 18 pages, 10 figures (48 eps files), 2 tables. V2: one wrong reference removed, missing reference in text inserted; matche
Scientific paper
10.1103/PhysRevD.76.074032
We present a detailed analysis of meson-induced massive lepton (muon) Drell--Yan production for the process $\pi^{-}N\to\mu^{+}\mu^{-}X$, considering both an unpolarized nucleon target and longitudinally polarized protons. Using a QCD framework, we focus on the angular distribution of $\mu^+$, which is sensitive to the shape of the pion distribution amplitude, the goal being to test corresponding results against available experimental data. Predictions are made, employing various pion distribution amplitudes, for the azimuthal angle dependence of the $\mu^{+}$ distribution in the polarized case, relevant for the planned COMPASS experiment. QCD evolution is given particular attention in both considered cases.
Bakulev Alexander P.
Stefanis N. G.
Teryaev Oleg V.
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