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

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Abstract

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 \({pp^{\uparrow} \rightarrow hX}\) and its inclusion could provide a solution for the sign-mismatch problem.

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Authors and Affiliations

  1. Department of Physics, Barton Hall Temple University, Philadelphia, PA, 19122, USA

    Koichi Kanazawa & Andreas Metz

  2. Department of Physics, Niigata University, Ikarashi, Niigata, 950-2181, Japan

    Yuji Koike

  3. RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY, 11973, USA

    Daniel Pitonyak

Authors
  1. Koichi Kanazawa
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  2. Yuji Koike
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  3. Andreas Metz
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  4. Daniel Pitonyak
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Correspondence to Koichi Kanazawa.

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Kanazawa, K., Koike, Y., Metz, A. et al. New Collinear Twist-3 Analysis of Transverse SSA: Toward a Solution for the Sign-Mismatch Problem. Few-Body Syst 56, 343–348 (2015). https://doi.org/10.1007/s00601-014-0913-4

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  • DOI: https://doi.org/10.1007/s00601-014-0913-4

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