Single Spin Asymmetries in l p(transv. pol.) --> h X processes and transverse momentum dependent factorization

Journal Article · Sun Jun 01 00:00:00 EDT 2014 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.89.114026· OSTI ID:1135909

Anselmino, Mauro; Mariaelena, Boglione; D'Alesio, Umberto; Melis, Stefano; Murgia, Francesco; Prokudin, Alexey ^[1]

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1. JLAB

Some estimates for the transverse Single Spin Asymmetry, A_N, in the inclusive processes l p(transv. Pol.) --> h X, given in a previous paper, are expanded and compared with new experimental data. The predictions are based on the Sivers distributions and the Collins fragmentation functions which fit the azimuthal asymmetries measured in Semi-Inclusive Deep Inelastic Scattering (SIDIS) processes (l p(transv. Pol.) --> l' h X). The factorisation in terms of Transverse Momentum Dependent distribution and fragmentation functions (TMD factorisation) -- i.e., the theoretical framework in which SIDIS azimuthal asymmetries are analysed -- is assumed to hold also for the inclusive process l p --> h X at large P_T. The values of A_N thus obtained agree in sign and shape with the data. Some predictions are given for future experiments.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1135909
• Report Number(s): JLAB-THY-14-1872; DOE/OR/23177-3047; arXiv:1404.6465
• Journal Information: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 89, Issue 11; ISSN 1550-7998
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English