Thermodynamic and Transport Properties of Matter Formed in pp, p-Pb, Xe-Xe and Pb-Pb Collisions at the Large Hadron Collider using Color String Percolation Model
release_f6baz3nx4baajdsczgef2joex4
by
Dushmanta Sahu, Raghunath Sahoo
2020
Abstract
To have a better understanding of the matter formed in ultra-relativistic
collisions, using the Color String Percolation Model (CSPM), we have estimated
initial energy density, mean free path, squared speed of sound, shear viscosity
to entropy density ratio (η/s), bulk viscosity to entropy density ratio
and bulk modulus for pp, p-Pb, Xe-Xe and Pb-Pb collisions at the Large
Hadron Collider (LHC). These observables are studied as a function of final
state charged particle multiplicity density and initial state percolation
temperature. The results from this work are compared with the results from well
known QCD models and with the transport properties of matter found in
day-to-day life. These observables allow us to conclude an array of important
findings about the matter formed in high energy collisions at the LHC. This
work gives a threshold of charged particle multiplicity 〈 dN_ch/dη〉≃ 20, after which there are indications of change in the dynamics
of the systems. The critical initial energy density and temperature as
estimated by lattice QCD, are observed to be achieved for events with final
state multiplicity 〈 dN_ch/dη〉≥ 20. In addition, for
these high-multiplicity events, the estimated η/s are comparable with that
is observed for heavy-ion collisions, which is an indication of a strongly
coupled Quark Gluon Plasma. This makes LHC high-multiplicity pp collision
events as probable candidates for the search of QGP droplets.
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