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Title: New collinear twist-3 analysis of transverse SSA: Toward a resolution for the sign-mismatch problem

We present a new collinear twist-3 analysis of the transverse SSA AN at RHIC. We use the TMD Sivers/Collins function to fix some of the relevant collinear twist-3 functions and perform a fit of the RHIC data with other parameterized twist-3 functions. This allows us to keep the consistency among descriptions in pp collision, SIDIS, and e+e annihilation and thus could provide a unified description of the spin asymmetries in the low- and high-PT processes. In conclusion, by taking into account the twist-3 fragmentation contribution, we show for the first time this contribution could be the main source of AN in pp → hX and its inclusion could provide a solution for the sign-mismatch problem.
 [1] ;  [2] ;  [3] ;  [1]
  1. Temple Univ., Philadelphia, PA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Niigata Univ., Niigata (Japan)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0177-7963; R&D Project: PO-3
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Few-Body Systems
Additional Journal Information:
Journal Volume: 56; Journal Issue: 6-9; Journal ID: ISSN 0177-7963
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS single-spin asymmetries; collinear factorization; twist-3 fragmentation