New Collinear Twist-3 Analysis of Transverse SSA: Toward a Solution for the Sign-Mismatch Problem

作者：Kanazawa Koichi^*; Koike Yuji; Metz Andreas; Pitonyak Daniel

来源：Few-Body Systems, 2015, 56(6-9): 343-348.

DOI：10.1007/s00601-014-0913-4

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. 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 and its inclusion could provide a solution for the sign-mismatch problem.

• 出版日期2015-9