Indication of Collective flow and Transparency in p-p Collisions at LHC.
September 07, 2017
September 08, 2017
The mid-rapidity transverse momentum spectra of various hadrons and the available
rapidity distributions of some strange hadrons produced in p-p collisions at LHC energy √sNN = 7.0
TeV have been studied using a Unified Statistical Thermal Freeze-out Model (USTFM). The
calculated results are found to be in good agreement with the experimental data. The theoretical fits
of the transverse momentum spectra using the model calculations provide the thermal freeze-out
conditions in terms of the temperature and collective flow parameters for different hadronic species.
The study reveal the presence of significant collective flow and a well defined temperature in the
system thus indicating the formation of a thermally equilibrated hydrodynamic system in p-p
collisions at LHC. Moreover, the fits to the available experimental rapidity distributions data of
strange hadrons show the effect of almost complete transparency in p-p collisions at LHC. The
transverse momentum distributions of protons and kaons produced in p-p collisions at √sNN = 200
GeV and √sNN = 2.76 TeV have also been reproduced successfully. The model incorporates
longitudinal as well as a transverse hydrodynamic flow. The contributions from heavier decay
resonances have also been taken into account. We have also imposed the criteria of exact strangeness
conservation in the system.
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