2014/02/27 by Premomoy Ghosh, Sanjib Muhuri, Jajati k. Nayak +1 · 1 citation
Physics and Astronomy · #hep-ph #nucl-th
paper · pdf · doi:10.1088/0954-3899/41/3/035106
published as J. Phys. G: Nucl. Part. Phys. 41 (2014) 035106 · 14 pages 8 figures
arxiv created 2014/02/27 · arxiv updated 2014/02/28
We analyze the measured spectra of π^±, K^±, p( p) in pp collisions at √ s = 0.9, 2.76 and 7 TeV, in the light of blast-wave model to extract the transverse radial flow velocity and kinetic temperature at freeze-out for the system formed in pp collisions. The dependency of the blast-wave parameters on average charged particle multiplicity of event sample or the `centrality' of collisions has been studied and compared with results of similar analysis in nucleus-nucleus (AA) and proton-nucleus (pA) collisions. We analyze the spectra of Ks0, Λ( Λ) and Ξ- also to see the dependence of blast-wave description on the species of produced particles. Within the framework of the blast-wave model, the study reveals indication of collective behavior for high-multiplicity events in pp collisions at LHC. Strong transverse radial flow in high multiplicity pp collisions and its comparison with that in pA and AA collisions match with predictions from a very recent theoretical work [Shuryak and Zahed 2013 arXiv:1301.4470] that addresses the conditions for applicability of hydrodynamics in pp and pA collisions.