Physics Commons^™

First Measurement Of Direct Photoproduction Of The A2(1320)⁰ Meson On The Proton, K.P. Adhikari, M. J. Amaryan, D. Bullumulla, F. Hauenstein, M. Khachatryan, Y. Prok, Et Al., Clas Collaboration

Physics Faculty Publications

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 …