2024/05/15 by A. J. Clara Figueiredo, Figueiredo, A. J. Clara, T. C. Jude +39
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2405.09392
openalex publication_date 2024/05/15 · openalex created_date 2024/05/17 · openalex updated_date 2026/07/30
The coherent reaction, γd → π0ηd was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 3200 MeV. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and π0 and η decays in the central BGO Rugby Ball. The strength of the differential cross section exceeds what can be described by models of coherent photoproduction at forward angles by orders of magnitude. The distribution of the differential cross section has an excellent agreement with a model including quasi-free Δπ photoproduction, pion re-scattering and N(1535) formation and subsequent nucleon coalescence to the deuteron. This also gives a reasonable description of the two-body invariant mass distributions and naturally explains the similar magnitudes of this channel and π0π0 d coherent photoproduction.