Multiplicity dependence of charged pion, kaon, and (anti)proton production at large transverse momentum in p-Pb collisions at $\sqrt{{\text{s}}_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The production of charged pions, kaons and (anti)protons has been measured at mid-rapidity ($-0.5<y<0$) in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV using the ALICE detector at the LHC. Exploiting particle identification capabilities at high transverse momentum ($p_{\mathrm{T}}$), the previously published $p_{\mathrm{T}}$ spectra have been extended to include measurements up to 20 GeV/$c$ for seven event multiplicity classes. The $p_{\mathrm{T}}$ spectra for pp collisions at $\sqrt{s}=7$ TeV, needed to interpolate a pp reference spectrum, have also been extended up to 20 GeV/$c$ to measure the nuclear modification factor ($R_{\mathrm{pPb}}$) in non-single diffractive p-Pb collisions. At intermediate transverse momentum ($2<p_{\mathrm{T}}<10$\,GeV/$c$) the proton-to-pion ratio increases with multiplicity in p-Pb collisions, a similar effect is not present in the kaon-to-pion ratio. The $p_{\mathrm{T}}$ dependent structure of such increase is qualitatively similar to those observed in pp and heavy-ion collisions. At high $p_{\mathrm{T}}$ ($>10$ GeV/$c$), the particle ratios are consistent with those reported for pp and Pb-Pb collisions at the LHC energies. At intermediate $p_{\mathrm{T}}$ the (anti)proton $R_{\mathrm{pPb}}$ shows a Cronin-like enhancement, while pions and kaons show little or no nuclear modification. At high $p_{\mathrm{T}}$ the charged pion, kaon and (anti)proton $R_{\mathrm{pPb}}$ are consistent with unity within statistical and systematic uncertainties.

26 pages, 12 captioned figures, 3 tables, authors from page 21, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2258

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