Document Type

Article

Publication Date

2020

DOI

10.1103/PhysRevC.102.032201

Publication Title

Physical Review C

Volume

102

Issue

3

Pages

7 pp.

Abstract

We present the first measurement of the reaction 𝛾p -> a₂(1320)⁰ p in the photon energy range 3.5-5.5 GeV and four-momentum transfer squared 0.2 < -t < 2.0 GeV2. Data were collected with the CEBAF Large Acceptance Spectrometer detector at the Thomas Jefferson National Accelerator Facility. The a2resonance was detected by measuring the reaction 𝛾p → π0ηp and reconstructing the π0η invariant mass. The most prominent feature of the differential cross section is a dip at -t ≈ 0.55 GeV2. This can be described in the framework of Regge phenomenology, where the exchange degeneracy hypothesis predicts a zero in the reaction amplitude for this value of the four-momentum transfer.

Comments

"Yes, the author or the author's employer may use all or part of the APS published article, including the APS-prepared version (e.g., the PDF from the online journal) without revision or modification, on the author's or employer's website as long as a fee is not charged. If a fee is charged, then APS permission must be sought. In all cases, the appropriate bibliographic citation and notice of the APS copyright must be included."

© American Physical Society.

Publisher's version available at: https://doi.org/10.1103/PhysRevC.102.032201

Original Publication Citation

Celentano, A., Battaglieri, M., De Vita, ... Zachariou, N., Zhang, J., Zhao, Z. W., et al. CLAS Collaboration (2020). First measurement of direct photoproduction of the a₂(1320)⁰ meson on the proton. Physical Review C, 102(3), 7 pp., Article 032201. https://doi.org/10.1103/PhysRevC.102.032201

Share

COinS