Correlation between heavy flavour production and multiplicity in pp and p-Pb collisions at high energy in the multi-pomeron exchange model

TL;DR

This paper uses the multi-pomeron exchange model to explain the observed increase in heavy flavor production with multiplicity in high-energy pp and p-Pb collisions, highlighting string interactions and collectivity effects.

Contribution

The study introduces a string-string interaction collectivity mechanism within the multi-pomeron exchange model to explain multiplicity dependence of heavy flavor production in high-energy collisions.

Findings

Faster-than-linear growth of open charm with multiplicity explained by string tension modification.

Model successfully reproduces multiplicity and transverse momentum correlations across energies.

Extension of the model to p-Pb collisions provides insights into heavy flavor production in nuclear interactions.

Abstract

The multiplicity dependence of heavy flavour production in pp-collisions at LHC energies is studied in the framework of the multi-pomeron exchange model. The model is introducing the string-string interaction collectivity effects in pp collisions, which modifies multiplicity and transverse momenta, leading to the non-trivial mean pt vs. multiplicity (<pt>_Nch - Nch) correlation. The string collectivity strength parameter is fixed by experimental data on multiplicity and transverse momentum correlation in a wide energy range (from ISR to LHC). The particles discrimination is implemented according to Schwinger mechanism taking into account the strong decays of hadron resonances. We demonstrate, that the faster-than-linear growth of the open charm production with the event charged particle multiplicity, observed in experimental pp high energy collisions, can be explained by the modification of the string tension due to the increasing overlap and interaction of quark-gluon strings. The model is extended for p-A interactions and the calculations for p-Pb collisions are performed.