Speaker
Description
Collectivity is an essential feature of the strongly interacting matter formed in the deconfined phase of quarks and gluons in the collisions of nuclei at relativistic energies. Experimentally such collective behaviour has been observed in heavy ion collisions at RHIC and LHC energies. The other observations, like strangeness enhancement, also support the existence of quark-gluon plasma in heavy-ion collisions. In comparison, the formation of QGP in $p+p$ collisions is ignored so far due to the lack of particle number density in p+p collisions. Thus over the decades, the $p+p$ collision systems have served as a baseline for heavy-ion collisions and helped in revealing the unconventional demeanour of the heavy-ion collisions. In contrast to that, recently, collective behaviour and strangeness enhancement have been observed in $p+p$ collisions at the LHC energies. These observations suggest that the existence of a QGP-like medium in small systems cannot be ruled out completely if collision energy is large enough. Inspired by these observations, we attempt to investigate the existence of QGP-like medium in $p+p$ collisions at $\sqrt{s} =$ 5.02, 7 and 13 TeV collisions energies. We employ (1+1) D second-order viscous hydrodynamics in this study to account for the QGP medium evolution. Further, we use the Unified Model of Quarkonia Suppression (UMQS) to explain the experimental data available in the form of the normalized charmonium yield with respect to the normalized charged-particle multiplicity. Our UMQS model contains possible QGP effects which govern the net quarkonia yield in ultrarelativistic collisions. Our theoretical study supports the idea of the existence of a QGP-like medium in $p+p$ collisions.
| Session | Heavy Ions and QCD |
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