Monte-Carlo simulation of events with Drell-Yan lepton pairs from antiproton-proton collisions

Abstract

The complete knowledge of the nucleon spin structure at leading twist requires also addressing the transverse spin distribution of quarks, or transversity, which is yet unexplored because of its chiral-odd nature. Transversity can be best extracted from single-spin asymmetries in fully polarized Drell-Yan processes with antiprotons, where valence contributions are involved anyway. Alternatively, in single-polarized Drell-Yan the transversity happens convoluted with another chiral-odd function, which is likely to be responsible for the well known (and yet unexplained) violation of the Lam-Tung sum rule in the corresponding unpolarized cross section. We present Monte-Carlo simulations for the unpolarized and single-polarized Drell-Yan $\bar{p}{p}^{(\uparrow )}\to {\mu }^{+}{\mu }^{-}X$ at different center-of-mass energies in both configurations where the antiproton beam hits a fixed proton target or it collides on another proton beam. The goal is to estimate the minimum number of events needed to extract the above chiral-odd distributions from future measurements at the HESR ring at GSI. It is important to study the feasibility of such experiments at HESR in order to demonstrate that interesting spin physics can be explored already using unpolarized antiprotons.

Deeply revised text with improved discussion of kinematics and results; added one table; 12 figures. Accepted for publication in Phys. Rev. D

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Cited by in corpus (26)

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• Future Prospects for Hadron Physics at PANDA
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• Modeling dihadron fragmentation functions
• Weighted azimuthal asymmetries in a diquark spectator model
• Azimuthal asymmetries in unpolarized Drell-Yan processes and the Boer-Mulders distributions of antiquarks
• TMDs and SSAs in hadronic interactions
• Dilepton production near partonic threshold in transversely polarized proton-antiproton collisions
• $T$-Odd Effects in Unpolarized Drell-Yan Scattering
• Transversity and its accompanying T-odd distribution from Drell-Yan processes with pion-proton collisions
• Direct extraction of transversity and its accompanying T-odd distribution from the unpolarized and single-polarized Drell-Yan processes
• Monte Carlo simulation of events with Drell-Yan lepton pairs from antiproton-proton collisions: the fully polarized case
• The cos 2 phi asymmetry of Drell-Yan and J/psi production in unpolarized ppbar scattering
• Monte Carlo simulation of single spin asymmetries in pion-proton collisions
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• Boer-Mulders effect in the unpolarized pion induced Drell-Yan process at COMPASS within TMD factorization
• Boer-Mulders function of pion meson and $q_T$-weighted $\cos 2\varphi$ asymmetry in the unpolarized ${\pi }^{-}p$ Drell-Yan at COMPASS
• A scheme for fast exploratory simulation of azimuthal asymmetries in Drell-Yan experiments at intermediate energies. The DY_AB Monte Carlo event generator
• Spin physics with antiprotons
• 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
• Azimuthal asymmetries in unpolarized Drell-Yan events on nuclear targets
• At the borderline between exclusive and inclusive physics: Study of Drell-Yan fragments in the PANDA experiment (A preliminary simulation)
• A study on the feasibility of a precise measurement of the $\tau$-dependence of the cross sections for Drell-Yan experiments at moderate energies