On the potential role of the Collins effect in A_N in pp --> pion X
M. Anselmino (1), M. Boglione (1), U. D'Alesio (2,3), E. Leader (4),, S. Melis (5), F. Murgia (3), A. Prokudin (6) ((1) University of Torino and, INFN, Torino, Italy, (2) University of Cagliari, Italy, (3) INFN, Cagliari,, Italy, (4) Imperial College, London, UK, (5) ECT, Trento
TL;DR
This paper investigates the Collins effect's potential contribution to transverse single spin asymmetries in proton-proton collisions producing pions, using updated data within a transverse momentum dependent factorization framework.
Contribution
It provides new estimates of the Collins effect's role in asymmetries by incorporating the latest SIDIS and e+e- data, refining previous analyses.
Findings
Updated Collins contribution estimates with recent data
Reaffirmation of the Collins effect's relevance in A_N
Enhanced understanding of transverse spin phenomena
Abstract
Transverse single spin asymmetries in pp --> pion X processes, while on a quite firm ground experimentally, are still a much debated phenomenological issue. We consider them in a transverse momentum dependent factorization scheme. After revisiting a previous result, we give new estimates of the Collins contribution by adopting the latest information on the Collins and transversity functions, as extracted from SIDIS and e+e- data.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Dark Matter and Cosmic Phenomena