Extraction of finite-energy contributions to the Sivers asymmetry from the analysis of exclusive proton-proton scattering

Abstract

I study the effect of scalar and spin-orbit rescattering terms, in the production of a nonzero Sivers-like asymmetry in proton-proton collisions (nclusive production and Drell-Yan) at moderate center of mass energies $\sqrt{s}$ $<$ 15 GeV and transverse momentum up to 3 GeV/c. An ultrarelativistic generalization of the Glauber formalism is here used to (i) fit the scalar and spin-orbit interaction terms on proton-proton elastic scattering data, including analyzing power, (ii) transfer such information to inclusive proton-proton scattering. It is shown that the phenomenological interactions responsible for the nonzero analyzing power in proton-proton elastic scattering produce a relevant nonzero analyzing power in inclusive processes associated with proton-proton collisions. This could represent a relevant (possibly higher-twist) contribution to the Sivers asymmetry.

35 pages, 11 figures

References in corpus (6)

• Matches and mismatches in the descriptions of semi-inclusive processes at low and high transverse momentum
• A Unified Picture for Single Transverse-Spin Asymmetries in Hard Processes
• Single Transverse-Spin Asymmetry in Drell-Yan Production at Large and Moderate Transverse Momentum
• A quark model analysis of the Sivers function
• Effective role of unpolarized nonvalence partons in Drell-Yan single spin asymmetries
• T-odd distributions, breaking of long range correlations, and sudden entropy changes, in Drell-Yan high-energy processes