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 des...

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Published in:Few-body systems 2014-10, Vol.56 (6-9)
Main Authors: Kanazawa, Koichi, Pitonyak, Daniel, Koike, Yuji, Metz, Andreas
Format: Article
Language:English
Subjects:
collinear factorization
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
single-spin asymmetries
twist-3 fragmentation
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Pitonyak, Daniel
Koike, Yuji
Metz, Andreas
description 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.
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subjects collinear factorization
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
single-spin asymmetries
twist-3 fragmentation
title New collinear twist-3 analysis of transverse SSA: Toward a resolution for the sign-mismatch problem
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