Role of transverse momentum dependence of unpolarized parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries

Anselmino, Mauro; Boglione, Mariaelena; D'Alesio, Umberto; Murgia, Francesco; Prokudin, Alexei

doi:10.1103/PhysRevD.98.094023

Title: Role of transverse momentum dependence of unpolarized parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries

Journal Article · 27 November 2018 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.98.094023 · OSTI ID:1483449

Anselmino, Mauro ^[1]; Boglione, Mariaelena ^[1]; D'Alesio, Umberto ^[2]; Murgia, Francesco ^[3];

^[4]

Univ. of Torino, Torino (Italy); INFN, Torino (Italy)
Univ. of Cagliari, Monserrato (CA) (Italy); INFN, Monserrato (CA) (Italy)
INFN, Monserrato (CA) (Italy)
Penn State Univ. Berks, Reading, PA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Information on the Sivers distribution and the Collins fragmentation functions and their transverse momentum dependence is mainly based on fitting single-spin asymmetry data from semi-inclusive deep inelastic scattering (SIDIS). Independent information on the Sivers distribution and the Collins fragmentation can be obtained from the Drell-Yan and e⁺e^- annihilation processes, respectively. In the SIDIS case, the transverse momentum of the final observed hadron, which is the quantity measured, is generated both by the average transverse momentum in the distribution and by that in the fragmentation functions. As a consequence, these are strongly correlated, and a separate extraction is made difficult. In this paper we investigate, in a simple kinematical Gaussian configuration, this correlation, its role on the transverse single-spin asymmetries in SIDIS, and the consequences for predictions of the Sivers asymmetry in Drell-Yan processes and for the Collins asymmetry in e⁺e^- annihilation. Here, we find that, in some cases, these effects can be relevant and must be carefully taken into account.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177; PHY-1623454

OSTI ID:: 1483449

Alternate ID(s):: OSTI ID: 1484446

Report Number(s):: JLAB-THY-18-2880; DOE/OR/23177-4609; arXiv:1809.09500; PRVDAQ

Journal Information:: Physical Review D, Vol. 98, Issue 9; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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