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Polarization and Dilepton Angular Distribution in Pion-Nucleon Collisions

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Abstract

We study hadronic polarization and the related anisotropy of the dilepton angular distribution for the reaction \(\pi N \rightarrow Ne^+e^-\). We employ consistent effective interactions for baryon resonances up to spin-5/2 to compute their contribution to the anisotropy coefficient. We show that the spin and parity of the intermediate baryon resonance is reflected in the angular dependence of the anisotropy coefficient. We present results for the anisotropy coefficient including the N(1520) and N(1440) resonances, which are essential at the collision energy of the recent data obtained by the HADES collaboration on this reaction. We conclude that the anisotropy coefficient provides useful constraints for unraveling the resonance contributions to this process.

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Acknowledgements

The work of E.S. was supported by VH-NG-823, Helmholtz Alliance HA216/EMMI and GSI. M.Z. was supported by the Hungarian OTKA Fund No. K109462 and EMMI. The work of B.F. was partially supported by EMMI.

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Authors and Affiliations

  1. Wigner Research Center for Physics, Budapest, 1121, Hungary

    Miklós Zétényi

  2. Institut für Theoretische Physik, Goethe-Universität, 60438, Frankfurt am Main, Germany

    Enrico Speranza

  3. GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany

    Bengt Friman

Authors
  1. Miklós Zétényi
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  2. Enrico Speranza
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  3. Bengt Friman
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Corresponding author

Correspondence to Miklós Zétényi.

Additional information

This article belongs to the Topical Collection “NSTAR 2017—The International Workshop on the Physics of Excited Nucleons”.

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Zétényi, M., Speranza, E. & Friman, B. Polarization and Dilepton Angular Distribution in Pion-Nucleon Collisions. Few-Body Syst 59, 138 (2018). https://doi.org/10.1007/s00601-018-1461-0

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  • DOI: https://doi.org/10.1007/s00601-018-1461-0

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