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Towards an explanation of transverse single-spin asymmetries in proton-proton collisions: The role of fragmentation in collinear factorization

Koichi Kanazawa1,2, Yuji Koike3, Andreas Metz2, and Daniel Pitonyak4

  • 1Graduate School of Science and Technology, Niigata University, Ikarashi, Niigata 950-2181, Japan
  • 2Department of Physics, Barton Hall, Temple University, Philadelphia, Pennsylvania 19122, USA
  • 3Department of Physics, Niigata University, Ikarashi, Niigata 950-2181, Japan
  • 4RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA

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Phys. Rev. D 89, 111501(R) – Published 5 June, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.111501

Abstract

We study the transverse single-spin asymmetry for single-hadron production in proton-proton collisions within the framework of collinear twist-3 factorization in quantum chromodynamics. By taking into account the contribution due to parton fragmentation, we obtain a very good description of all high transverse-momentum data for neutral and charged pion production from the Relativistic Heavy Ion Collider. Our study may provide the crucial step toward a final solution to the long-standing problem of what causes transverse single-spin asymmetries in hadronic collisions within quantum chromodynamics. We show for the first time that it is possible to simultaneously describe spin/azimuthal asymmetries in proton-proton collisions, semi-inclusive deep-inelastic scattering, and electron-positron annihilation by using collinear twist-3 factorization in the first process along with transverse-momentum-dependent functions extracted from the latter two reactions.

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Phys. Rev. D 89, 111501(R)– Published 5 June, 2014
  • Received 8 April 2014

© 2014 American Physical Society

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