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Title: Parton intrinsic motion: Suppression of the Collins mechanism for transverse single spin asymmetries in p{sup {up_arrow}}p{yields}{pi}X

Abstract

We consider a general formalism to compute inclusive polarized and unpolarized cross sections within pQCD and the factorization scheme, taking into account parton intrinsic motion in distribution and fragmentation functions, as well as in the elementary dynamics. Surprisingly, the intrinsic partonic motion, with all the correct azimuthal angular dependences, produces a strong suppression of the transverse single spin asymmetry arising from the Collins mechanism. As a consequence, and in contradiction with earlier claims, the Collins mechanism is unable to explain the large asymmetries found in p{sup {up_arrow}}p{yields}{pi}X at moderate to large Feynman x{sub F}. The Sivers effect is not suppressed.

Authors:
;  [1]; ;  [2];  [3]
  1. Dipartimento di Fisica Teorica, Universita di Torino and INFN, Sezione di Torino, Via P. Giuria 1, I-10125 Torino (Italy)
  2. INFN, Sezione di Cagliari and Dipartimento di Fisica, Universita di Cagliari, C.P. 170, I-09042 Monserrato, CA (Italy)
  3. Imperial College, Prince Consort Road, London, SW7 2BW (United Kingdom)
Publication Date:
OSTI Identifier:
20705699
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 71; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.71.014002; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; BARYONS; DISTRIBUTION; FACTORIZATION; INCLUSIVE INTERACTIONS; PARTICLE PRODUCTION; PARTON MODEL; PARTONS; PERTURBATION THEORY; POLARIZATION; POLARIZED BEAMS; PROTON BEAMS; PROTON-PROTON INTERACTIONS; QUANTUM CHROMODYNAMICS; SPIN

Citation Formats

Anselmino, M, Boglione, M, D'Alesio, U, Murgia, F, and Leader, E. Parton intrinsic motion: Suppression of the Collins mechanism for transverse single spin asymmetries in p{sup {up_arrow}}p{yields}{pi}X. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.71.014002.
Anselmino, M, Boglione, M, D'Alesio, U, Murgia, F, & Leader, E. Parton intrinsic motion: Suppression of the Collins mechanism for transverse single spin asymmetries in p{sup {up_arrow}}p{yields}{pi}X. United States. https://doi.org/10.1103/PhysRevD.71.014002
Anselmino, M, Boglione, M, D'Alesio, U, Murgia, F, and Leader, E. Sat . "Parton intrinsic motion: Suppression of the Collins mechanism for transverse single spin asymmetries in p{sup {up_arrow}}p{yields}{pi}X". United States. https://doi.org/10.1103/PhysRevD.71.014002.
@article{osti_20705699,
title = {Parton intrinsic motion: Suppression of the Collins mechanism for transverse single spin asymmetries in p{sup {up_arrow}}p{yields}{pi}X},
author = {Anselmino, M and Boglione, M and D'Alesio, U and Murgia, F and Leader, E},
abstractNote = {We consider a general formalism to compute inclusive polarized and unpolarized cross sections within pQCD and the factorization scheme, taking into account parton intrinsic motion in distribution and fragmentation functions, as well as in the elementary dynamics. Surprisingly, the intrinsic partonic motion, with all the correct azimuthal angular dependences, produces a strong suppression of the transverse single spin asymmetry arising from the Collins mechanism. As a consequence, and in contradiction with earlier claims, the Collins mechanism is unable to explain the large asymmetries found in p{sup {up_arrow}}p{yields}{pi}X at moderate to large Feynman x{sub F}. The Sivers effect is not suppressed.},
doi = {10.1103/PhysRevD.71.014002},
url = {https://www.osti.gov/biblio/20705699}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 1,
volume = 71,
place = {United States},
year = {2005},
month = {1}
}