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Title: Transverse single-spin asymmetries: Challenges and recent progress

In this study, transverse single-spin asymmetries are among the most intriguing observables in hadronic physics. Though such asymmetries were already measured for the first time about four decades ago, their origin is still under debate. Here we consider transverse single-spin asymmetries in semi-inclusive lepton–nucleon scattering, in nucleon–nucleon scattering, and in inclusive lepton–nucleon scattering. It is argued that, according to recent work, the single-spin asymmetries for those three processes may be simultaneously described in perturbative QCD, where the re-scattering of the active partons plays a crucial role. A comparison of single-spin asymmetries in different reactions can also shed light on the universality of transverse momentum dependent parton correlation functions. In particular, we discuss what existing data may tell us about the predicted process dependence of the Sivers function.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [3]
  1. Temple Univ., Philadelphia, PA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Regensburg Univ., Regensburg (Germany)
  4. Tubingen Univ., Tubingen (Germany)
Publication Date:
OSTI Identifier:
1228858
Report Number(s):
BNL--108590-2015-JA
Journal ID: ISSN 0177-7963; R&D Project: PO-3
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Few-Body Systems
Additional Journal Information:
Journal Volume: 56; Journal Issue: 6-9; Journal ID: ISSN 0177-7963
Publisher:
Springer
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
RIKEN
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Riken BNL Research Center; single-spin asymmetries; twist-3 collinear factorization; multi-parton correlations; universality of parton correlators