SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 67: Hadron Structure and Spectroscopy VIII

HK 67.2: Vortrag

Donnerstag, 23. März 2023, 16:15–16:30, SCH/A316

Studies of Coherent Photoproduction off the Deuteron at the BGOOD Experiment — •Antonio Joao Clara Figueiredo for the BGOOD collaboration — Physikalisches Institut der Universität Bonn

The BGOOD photo production experiment [1] at the ELSA facility [2] 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. Typically used to study strangeness photoproduction at low t, the setup also enables studies of coherent reactions off the deuteron where the deuteron takes the majority of the beam momentum.

Following a BGOOD publication on the π⁰π⁰ d [3] photoproduction supporting the three isoscalar dibaryon candidates reported by the ELPH collaboration [4], the presented work uses an improved method of momentum reconstruction in the forward spectrometer and uses a kinematic fit to improve invariant mass resolutions. Preliminary results are presented of the analysis of the pi⁰π⁰ d and π⁰η d final states.

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

[1] S. Alex et al., Eur. Phys. J. A 57 (2021) 80. [2] W. Hiller, Eur. Phys. J. A 28 (2006) 139. [3] T.C. Jude et al., Phys. Lett. B (2022) 137277. [4] T. Ishikawa et al., Phys. Lett. B 789 (2019) 413.