The production of charged pions, kaons and (anti)protons has been measured at mid-rapidity (k to view the MathML source">−0.5<y<0) in p–Pb collisions at using the ALICE detector at the LHC. Exploiting particle identification capabilities at high transverse momentum (k to view the MathML source">pT), the previously published k to view the MathML source">pT spectra have been extended to include measurements up to 20 GeV/c for seven event multiplicity classes. The k to view the MathML source">pT spectra for pp collisions at , needed to interpolate a pp reference spectrum, have also been extended up to 20 GeV/c to measure the nuclear modification factor (k to view the MathML source">RpPb) in non-single diffractive p–Pb collisions.
At intermediate transverse momentum (k to view the MathML source">2<pT<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 k to view the MathML source">pT dependent structure of such increase is qualitatively similar to those observed in pp and heavy-ion collisions. At high k to view the MathML source">pT (k to view the MathML source">>10 GeV/c), the particle ratios are consistent with those reported for pp and Pb–Pb collisions at the LHC energies.
At intermediate k to view the MathML source">pT the (anti)proton k to view the MathML source">RpPb shows a Cronin-like enhancement, while pions and kaons show little or no nuclear modification. At high k to view the MathML source">pT the charged pion, kaon and (anti)proton k to view the MathML source">RpPb are consistent with unity within statistical and systematic uncertainties.
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