Speaker
Description
A new generalization of the multipomeron exchange model [1-7] is proposed that provides a reasonable description of processes of pp, pA, and AA collisions. The main feature of this model is that the effect of string collectivity is accounted for by a given parameter associated with a change in string tension due to the fusion process. In a new approach, special attention is paid to the production in AA collisions of the hadrons containing strange quarks, which is generally considered as a signal of the formation of quark-gluon plasma. Besides the higher yield of strangness, increasing string tension results in a specific class of events with a large multiplicity and facilitates in the string fragmentation process creation of particles containing c-quark. This mechanism can be considered as an additional source of charm production [5].
The parameters of the model are fixed according to the dependence of the transverse momentum on the multiplicity in $pp$ and $p\bar{p}$ collisions in a wide energy range (from ISR to LHC). In addition, the yields of multistrange and charmed particles are obtained as a function of the charged multiplicity for Pb-Pb collisions at LHC energy, and the predictions of the model are compared with experimental data.
This work is supported by the SPbSU grant ID:75252518.
References:
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7. E. V. Andronov, V. N. Kovalenko, Bulletin of the Russian Academy of Sciences: Physics 84 (10), 1258 (2020).
