Left-right spin asymmetry in NhX

Leonard Gamberg, Zhong-Bo Kang, Andreas Metz, Daniel Pitonyak, and Alexei Prokudin
Phys. Rev. D 90, 074012 – Published 9 October 2014

Abstract

We consider the inclusive production of hadrons in lepton-nucleon scattering. For a transversely polarized nucleon this reaction shows a left-right azimuthal asymmetry, which we compute in twist-3 collinear factorization at leading order in perturbation theory. All nonperturbative parton correlators of the calculation are fixed through information from other hard processes. Our results for the left-right asymmetry agree in sign with recent data for charged pion production from the HERMES Collaboration and from Jefferson Lab. However, the magnitude of the computed asymmetries tends to be larger than the data. Potential reasons for this outcome are identified. We also give predictions for future experiments and highlight in particular the unique opportunities at an electron ion collider.

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  • Received 30 July 2014

DOI:https://doi.org/10.1103/PhysRevD.90.074012

© 2014 American Physical Society

Authors & Affiliations

Leonard Gamberg1,*, Zhong-Bo Kang2,†, Andreas Metz3,‡, Daniel Pitonyak4,§, and Alexei Prokudin5,∥

  • 1Division of Science, Penn State Berks, Reading, Pennsylvania 19610, USA
  • 2Los Alamos National Laboratory, Theoretical Division, Los Alamos, New Mexico 87545, USA
  • 3Department of Physics, Barton Hall, Temple University, Philadelphia, Pennsylvania 19122, USA
  • 4RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 5Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA

  • *lpg10@psu.edu
  • zkang@lanl.gov
  • metza@temple.edu
  • §dpitonyak@quark.phy.bnl.gov
  • prokudin@jlab.org

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Issue

Vol. 90, Iss. 7 — 1 October 2014

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