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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy VI

HK 47.2: Talk

Wednesday, March 13, 2024, 16:15–16:30, HBR 62: EG 19

Coherent π⁰η photoproduction off the deuteron at the BGOOD experiment — •António João Clara Figueiredo for the BGOOD collaboration — Physikalisches Institut, Universität Bonn

The BGOOD photoproduction experiment at the ELSA facility is uniquely designed to explore kinematics where a charged particle is identified in the forward spectrometer and a recoiling hadronic system is reconstructed in the central calorimeter at low momentum transfer.

The setup enables studies of coherent reactions off the deuteron at forward deuteron angles. This kinematic region would be expected to be suppressed due to the large momentum transfer to the deuteron. Measurements at BGOOD however have found this to not be the case.

Results on the coherent π⁰η photoproduction off the deuteron at the BGOOD experiment are presented. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and π⁰ and η decays in the central calorimeter. The differential cross section is an order of magnitude higher than expected. The distribution is described well by a simple model of a quasi-free reaction followed by pion exchange and the subsequent coalescence of the proton and neutron to the deuteron.

Supported by DFG projects 388979758/405882627 and the European Union’s Horizon 2020 programme, grant 824093.

Keywords: BGOOD; Photoproduction; Bonn