On the Possible Detection of New Particles from Data on Soft Photons in Collisions of Protons and Nuclei and from Data on Ultra-High-Energy Cosmic Rays

Abstract In order to develop the statistical model for proton-nucleus collisions at the stage of expansion of the compound nuclear system, the adiabatic temperature change and the correction to the Boltzmann distribution of the multiplicity of emitted secondary particles are additionally taken into account. As a result, improved agreement with experimental data is obtained compared to previous studies for the soft-photon spectrum by transverse momentum in pp collisions at an incident proton momentum of 450 GeV/c in order to isolate a clearly expressed X17 signal at around 17 MeV. An interpretation of the detection of a boson with mass 38 MeV in the spectra of photons emitted in reactions of protons with carbon nuclei at an incident proton momentum of 5.5 GeV/c is proposed. Analyzing the spectra of ultra-high-energy cosmic rays (photons), confirmation of the existence of new particles — the X17 and X38 bosons, with masses of 17 MeV and 38 MeV, respectively, has been found