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

Kanazawa, Koichi; Pitonyak, Daniel; Koike, Yuji; Metz, Andreas

doi:10.1007/s00601-014-0913-4

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

Journal Article · Sun Oct 19 00:00:00 EDT 2014 · Few-Body Systems

DOI:https://doi.org/10.1007/s00601-014-0913-4· OSTI ID:1228859

Kanazawa, Koichi ^[1]; Pitonyak, Daniel ^[2]; Koike, Yuji ^[3]; Metz, Andreas ^[1]

Temple Univ., Philadelphia, PA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Niigata Univ., Niigata (Japan)

We present a new collinear twist-3 analysis of the transverse SSA A_N 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-P_T 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 A_N in pp^↑ → hX and its inclusion could provide a solution for the sign-mismatch problem.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: RIKEN

Grant/Contract Number:: SC00112704

OSTI ID:: 1228859

Report Number(s):: BNL-108591-2015-JA; R&D Project: PO-3

Journal Information:: Few-Body Systems, Vol. 56, Issue 6-9; ISSN 0177-7963

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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

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