• Open Access

Moments of angular distribution and beam asymmetries in ηπ0 photoproduction at GlueX

V. Mathieu, M. Albaladejo, C. Fernández-Ramírez, A. W. Jackura, M. Mikhasenko, A. Pilloni, and A. P. Szczepaniak (Joint Physics Analysis Center Collaboration)
Phys. Rev. D 100, 054017 – Published 17 September 2019

Abstract

In the search for exotic mesons, the GlueX Collaboration will soon extract moments of the ηπ0 angular distribution. In the perspective of these results, we generalize the formalism of moment extraction to the case in which the two mesons are produced with a linearly polarized beam and build a model for the reaction γpηπ0p. The model includes resonant S, P, and D waves in ηπ0, produced by natural exchanges. Moments of the ηπ0 angular distribution are computed with and without the P wave, to illustrate the sensitivity to exotic resonances. Although little sensitivity to the P wave is found in moments of even angular momentum, moments of odd angular momentum are proportional to the interference between the P wave and the dominant S and D waves. We also generalize the definition of the beam asymmetry for two mesons photoproduction and show that, when the meson momenta are perpendicular to the reaction plane, the beam asymmetry enhances the sensitivity to the exotic P wave.

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  • Received 22 July 2019

DOI:https://doi.org/10.1103/PhysRevD.100.054017

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsParticles & Fields

Authors & Affiliations

V. Mathieu1,2,*, M. Albaladejo1,†, C. Fernández-Ramírez3, A. W. Jackura4,5, M. Mikhasenko6, A. Pilloni7,8, and A. P. Szczepaniak1,4,5 (Joint Physics Analysis Center Collaboration)

  • 1Theory Center, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
  • 2Departamento de Física Teórica, Universidad Complutense de Madrid, 28040 Madrid, Spain
  • 3Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
  • 4Center for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47403, USA
  • 5Physics Department, Indiana University, Bloomington, Indiana 47405, USA
  • 6CERN, 1211 Geneva 23, Switzerland
  • 7European Centre for Theoretical Studies in Nuclear Physics and related Areas (ECT*) and Fondazione Bruno Kessler, Villazzano (Trento), I-38123, Italy
  • 8INFN Sezione di Genova, Genova, I-16146, Italy

  • *vmathieu@ucm.es
  • albalade@jlab.org

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Issue

Vol. 100, Iss. 5 — 1 September 2019

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