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

Journal Article · Thu Jun 01 00:00:00 EDT 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.73.114002· OSTI ID:20774789

Bianconi, Andrea; Radici, Marco ^[1]

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1. Dipartimento di Chimica e Fisica per l'Ingegneria e per i Materiali, Universita di Brescia, I-25123 Brescia (Italy) and Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, I-27100 Pavia (Italy)

We present Monte Carlo simulations of both the Sivers and the Boer-Mulders effects in the polarized Drell-Yan {pi}{sup {+-}}p{sup {up_arrow}}{yields}{mu}{sup +}{mu}{sup -}X process at a kinematics suitable to the COMPASS setup. 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.

• OSTI ID: 20774789
• Journal Information: Physical Review. D, Particles Fields, Vol. 73, Issue 11; Other Information: DOI: 10.1103/PhysRevD.73.114002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
COMPUTERIZED SIMULATION
CROSS SECTIONS
DEEP INELASTIC SCATTERING
DISTRIBUTION
DRELL MODEL
MONTE CARLO METHOD
MUONS MINUS
MUONS PLUS
PION-PROTON INTERACTIONS
PIONS MINUS
PIONS PLUS
POLARIZATION
PROTONS
QUANTUM CHROMODYNAMICS
SEMI-INCLUSIVE INTERACTIONS
SPIN
SUM RULES