Constraints on the gluon Sivers distribution via transverse single spin asymmetries at midrapidity in p{sup {up_arrow}}p{yields}{pi}{sup 0}X processes at BNL RHIC
Abstract
We consider the recent RHIC data on the transverse single spin asymmetry (SSA) A{sub N}, measured in p{sup {up_arrow}}p{yields}{pi}{sup 0}X processes at midrapidity by the PHENIX Collaboration. The measurement is consistent with a vanishing SSA. We analyze this experimental information within a hard scattering approach based on a generalized QCD factorization scheme, with unintegrated, transverse momentum dependent (TMD), parton distribution and fragmentation functions. It turns out that, in the kinematical region of the data, only the gluon Sivers effect could give a large contribution to A{sub N}; its vanishing value is thus an indication about the possible size of the gluon Sivers function (GSF). Approximate upper limits on its magnitude are derived. Additional constraints obtained combining available parameterizations of the quark Sivers function and the Burkardt sum rule (BSR) for the Sivers distributions are also discussed.
 Authors:

 Dipartimento di Fisica Teorica, Universita di Torino and Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Via P. Giuria 1, I10125 Turin (Italy)
 Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari and Dipartimento di Fisica, Universita di Cagliari, C.P. 170, I09042 Monserrato (Canada) (Italy)
 Publication Date:
 OSTI Identifier:
 20873136
 Resource Type:
 Journal Article
 Journal Name:
 Physical Review. D, Particles Fields
 Additional Journal Information:
 Journal Volume: 74; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.74.094011; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 05562821
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; BROOKHAVEN RHIC; DISTRIBUTION; DISTRIBUTION FUNCTIONS; FACTORIZATION; GLUONS; PIONS NEUTRAL; POLARIZED BEAMS; PROTON BEAMS; PROTONPROTON INTERACTIONS; QUANTUM CHROMODYNAMICS; QUARKS; SCATTERING; SPIN; SUM RULES; TRANSVERSE MOMENTUM
Citation Formats
Anselmino, M, D'Alesio, U, Melis, S, and Murgia, F. Constraints on the gluon Sivers distribution via transverse single spin asymmetries at midrapidity in p{sup {up_arrow}}p{yields}{pi}{sup 0}X processes at BNL RHIC. United States: N. p., 2006.
Web. doi:10.1103/PHYSREVD.74.094011.
Anselmino, M, D'Alesio, U, Melis, S, & Murgia, F. Constraints on the gluon Sivers distribution via transverse single spin asymmetries at midrapidity in p{sup {up_arrow}}p{yields}{pi}{sup 0}X processes at BNL RHIC. United States. https://doi.org/10.1103/PHYSREVD.74.094011
Anselmino, M, D'Alesio, U, Melis, S, and Murgia, F. Wed .
"Constraints on the gluon Sivers distribution via transverse single spin asymmetries at midrapidity in p{sup {up_arrow}}p{yields}{pi}{sup 0}X processes at BNL RHIC". United States. https://doi.org/10.1103/PHYSREVD.74.094011.
@article{osti_20873136,
title = {Constraints on the gluon Sivers distribution via transverse single spin asymmetries at midrapidity in p{sup {up_arrow}}p{yields}{pi}{sup 0}X processes at BNL RHIC},
author = {Anselmino, M and D'Alesio, U and Melis, S and Murgia, F},
abstractNote = {We consider the recent RHIC data on the transverse single spin asymmetry (SSA) A{sub N}, measured in p{sup {up_arrow}}p{yields}{pi}{sup 0}X processes at midrapidity by the PHENIX Collaboration. The measurement is consistent with a vanishing SSA. We analyze this experimental information within a hard scattering approach based on a generalized QCD factorization scheme, with unintegrated, transverse momentum dependent (TMD), parton distribution and fragmentation functions. It turns out that, in the kinematical region of the data, only the gluon Sivers effect could give a large contribution to A{sub N}; its vanishing value is thus an indication about the possible size of the gluon Sivers function (GSF). Approximate upper limits on its magnitude are derived. Additional constraints obtained combining available parameterizations of the quark Sivers function and the Burkardt sum rule (BSR) for the Sivers distributions are also discussed.},
doi = {10.1103/PHYSREVD.74.094011},
url = {https://www.osti.gov/biblio/20873136},
journal = {Physical Review. D, Particles Fields},
issn = {05562821},
number = 9,
volume = 74,
place = {United States},
year = {2006},
month = {11}
}