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

Abstract

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.

Authors:
 [1];  [1];  [2];  [3]; ORCiD logo [4]
  1. Univ. of Torino, Torino (Italy); INFN, Torino (Italy)
  2. Univ. of Cagliari, Monserrato (CA) (Italy); INFN, Monserrato (CA) (Italy)
  3. INFN, Monserrato (CA) (Italy)
  4. Penn State Univ. Berks, Reading, PA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1483449
Alternate Identifier(s):
OSTI ID: 1484446
Report Number(s):
JLAB-THY-18-2880; DOE/OR/23177-4609; arXiv:1809.09500
Journal ID: ISSN 2470-0010; PRVDAQ
Grant/Contract Number:  
AC05-06OR23177; PHY-1623454
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 98; Journal Issue: 9; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Anselmino, Mauro, Boglione, Mariaelena, D'Alesio, Umberto, Murgia, Francesco, and Prokudin, Alexei. Role of transverse momentum dependence of unpolarized parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.094023.
Anselmino, Mauro, Boglione, Mariaelena, D'Alesio, Umberto, Murgia, Francesco, & Prokudin, Alexei. Role of transverse momentum dependence of unpolarized parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries. United States. doi:10.1103/PhysRevD.98.094023.
Anselmino, Mauro, Boglione, Mariaelena, D'Alesio, Umberto, Murgia, Francesco, and Prokudin, Alexei. Tue . "Role of transverse momentum dependence of unpolarized parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries". United States. doi:10.1103/PhysRevD.98.094023.
@article{osti_1483449,
title = {Role of transverse momentum dependence of unpolarized parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries},
author = {Anselmino, Mauro and Boglione, Mariaelena and D'Alesio, Umberto and Murgia, Francesco and Prokudin, Alexei},
abstractNote = {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.},
doi = {10.1103/PhysRevD.98.094023},
journal = {Physical Review D},
number = 9,
volume = 98,
place = {United States},
year = {Tue Nov 27 00:00:00 EST 2018},
month = {Tue Nov 27 00:00:00 EST 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.98.094023

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