Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions atsNN=2.76TeV

Momentum (technical analysis) Particle (ecology)
DOI: 10.1103/physrevc.93.034913 Publication Date: 2016-03-25T18:08:27Z
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ABSTRACT
Transverse momentum $({p}_{\mathrm{T}})$ spectra of pions, kaons, and protons up to ${p}_{\mathrm{T}}=20\phantom{\rule{0.28em}{0ex}}\text{GeV}/c$ have been measured in Pb-Pb collisions at $\sqrt{{s}_{\mathit{NN}}}=2.76\phantom{\rule{0.28em}{0ex}}\text{TeV}$ using the ALICE detector for six different centrality classes covering 0%--80%. The proton-to-pion kaon-to-pion ratios both show a distinct peak ${p}_{\mathrm{T}}\ensuremath{\approx}3\phantom{\rule{0.28em}{0ex}}\text{GeV}/c$ central that decreases more peripheral collisions. For ${p}_{\mathrm{T}}>10\phantom{\rule{0.28em}{0ex}}\text{GeV}/c$, nuclear modification factor is found be same all three particle species each interval within systematic uncertainties 10%--20%. This suggests there no direct interplay between energy loss medium composition hard core quenched jet. ${p}_{\mathrm{T}}<10\phantom{\rule{0.28em}{0ex}}\text{GeV}/c$, data provide important constraints models aimed describing transition from soft physics.
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