Speaker
Description
We use open charm production to estimate how far we can see back in time in high-energy hadron-hadron collisions. We analyze the transverse momentum distributions of the identified D mesons from pp, p–Pb and A–A collisions at the ALICE and STAR experiments covering the energy range from $\sqrt{s_{\rm NN}}$ = 200 GeV up to 7 TeV. While the low-momentum part of the spectra can be associated with particles stemming from a thermal equilibrium, the high-momentum regime follows a power-law-like distribution, resulting from perturbative QCD hadron production. Recent non-extensive thermodynamical models, however, are able to successfully describe the spectra within a unified framework [1]. We discuss the consistency of the resulting Tsallis temperature and non-extensivity parameter, and compare them to the ones of light-flavour hadrons. These results allow us to estimate the production time of D mesons in relation to the light-flavour hadrons [2].
[1] G. Bíró, G. G. Barnaföldi, T. S. Bíró, J. Phys. G: Nucl. Part. Phys. 47 (2020) 105002
[2] L. Gyulai, G. Bíró, R. Vértesi, G. G. Barnaföldi, preprint: arXiv:2401.14282 [hep-ph]
