Is there diffraction dissociation of nucleons in nucleus-nucleus interactions? Dear Colleagues! We invite you to take part in the VBLHEP Specialized A. M. Baldin Seminar “Relativistic nuclear physics and polarization phenomena” № 822 Date and Time: Wednesday, 5 June 2024, at 11:00 AM Venue: Conference Hall (bld. 3), the Veksler and Baldin Laboratory of High Energy Physics, online on Volna Seminar topic: “Is there diffraction dissociation of nucleons in nucleus-nucleus interactions?” Speaker: Vladimir Uzhinsky Authors: Vladimir Uzhinsky (MLIT JINR), Aida Galoyan (VBLHEP JINR), Alberto Ribon (CERN) Abstract: Theoretical/model descriptions of the latest data from the BM@N collaboration on the production of π+ and K+ mesons and protons in interactions of 40Ar nuclei with different nuclei at an energy of 3.2 A GeV are discussed. Considered models are PHSD, UrQMD and DCM/AGT. As usual, model predictions differ both from each other and from experimental data. All of the models do not consider nucleon diffraction dissociation explicitly. In inelastic pp interactions at high energies, the probability of diffraction processes is about 17%. In inelastic nucleus-nucleus interactions, diffraction dissociation processes can be suppressed. Besides, there may be processes of interactions of diffractive-excited nucleons both with nucleons of nuclei and with each other. They can be taken into account in the Geant4 FTF model that we are developing. A simplified approach to this problem gives satisfactory results in application to the BM@N data. Good results were also obtained by us for 40Ar + 45Sc interactions studied by the NA61/SHINE collaboration at projectile argon nucleus momenta of 13, 19, 30, 75 and 150 A GeV/c. According to the calculations, the processes of diffraction dissociation of nucleons in nucleus-nucleus interactions should be suppressed. A strong theoretical justification for this suppression must be found. Join the seminar
