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Information × Registration Number 0223U000709, 0122U002516 , R & D reports Title Dynamical and statistical properties of superdense matter formed in relativistic nucleus-nucleus and proton-proton collisions with high multiplicity at variable energies of RHIC and LHC colliders. Stage 2. Features of particle radiation, in particular photons, in nuclear-nuclear and proton-proton collisions at RHIC and LHC energies popup.stage_title Head Syniukov Yurii M., д.ф.-м.н. Registration Date 19-01-2023 Organization М.М.Bogolyubov Institute of Theoretical Physics of the National Academy of Sciences of Ukraine popup.description2 The comparison of the chemically equilibrated and the chemically frozen descriptions of the matter evolution at the post-hadronization stage shows that the chemically frozen expansion treatment leads to a slightly lower resulting pT spectra and vn coefficients of direct photons. The main conclusion that can be drawn from the performed analysis is that the problem of simultaneous theoretical description of the direct-photon spectra and flow harmonics, which appear to have unexpectedly large values in the experimental data, referred to as the “direct photon flow puzzle”, probably can be solved if one accounts for the extra contribution to the photon production connected with the process of confinement (hadronization) in the considered strongly interacting system. The phenomenological accounting for this additional portion of radiation is sufficient to significantly improve the agreement between the model and experimental results. We also argue that the decrease of the intersept of the two-boson correlation functions at fixed particle multiplicities is conditioned by the increase of the quasi-equilibrium ground-state contribution to the particle momentum spectra when the flow increases, We suggest that certain features of the multiplicity-dependent measurements of the Bose-Einstein momentum correlations in high-multiplicity proton-proton collision events at the LHC can be conditioned by the presence of ground-state condensates. Product Description popup.authors Adzhimambetov Musfer D Akkelin Sergii V. Синюков Юрій Михайлович Shapoval Volodymyr M popup.nrat_date 2023-01-19 Close