Monte Carlo simulation of single spin asymmetries in pion-proton collisions

Abstract

We present Monte Carlo simulations of both the Sivers and the Boer-Mulders effects in the polarized Drell-Yan ${\pi }^{\pm }{p}^{\uparrow }\to {\mu }^{+}{\mu }^{-}X$ process at the center-of-mass energy $\sqrt{s}\sim 14$ GeV reachable at COMPASS with pion beams of energy 100 GeV. For the Sivers effect, we adopt two different parametrizations for the Sivers function to explore the statistical accuracy required to extract unambiguous information on this parton density. In particular, we verify the possibility of checking its predicted sign change between Semi-Inclusive Deep-Inelastic Scattering (SIDIS) and Drell-Yan processes, a crucial test of nonperturbative QCD. For the Boer-Mulders effect, because of the lack of parametrizations we can make only guesses. The goal is to explore the possibility of extracting information on the transversity distribution, the missing piece necessary to complete the knowledge of the nucleon spin structure at leading twist, and the Boer-Mulders function, which is related to the long-standing problem of the violation of the Lam-Tung sum rule in the unpolarized Drell-Yan cross section.

arXiv commentRevTeX, 13 pages, 7 figures included in .eps format

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Cited by in corpus (11)

• Transverse-momentum distributions in a diquark spectator model
• Dilepton production from polarized hadron hadron collisions
• Intrinsic transverse parton momenta in deeply inelastic reactions
• The spin structure of the pion
• Pion TMDs in light-front constituent approach, and Boer-Mulders effect in the pion-induced Drell-Yan process
• Naive time-reversal odd phenomena in semi-inclusive deep-inelastic scattering from light-cone constituent quark models
• Weighted azimuthal asymmetries in a diquark spectator model
• Single spin asymmetry in $\pi p$ Drell-Yan process
• Effective role of unpolarized nonvalence partons in Drell-Yan single spin asymmetries
• Effects of azimuth-symmetric acceptance cutoffs on the measured asymmetry in unpolarized Drell-Yan fixed target experiments
• A study on the feasibility of a precise measurement of the $\tau$-dependence of the cross sections for Drell-Yan experiments at moderate energies