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

The ALICE collaboration
Phys.Lett. B760 (2016) 720-735, 2016

Abstract (data abstract)
CERN-LHC. The production of charged pions, kaons and (anti)protons has been measured at mid-rapidity ($-0.5 < y < 0$) in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV using the ALICE detector at the LHC. Exploiting particle identification capabilities at high transverse momentum ($p_{\rm T}$), the previously published $p_{\rm T}$ spectra have been extended to include measurements up to 20 GeV/$c$ for seven event multiplicity classes. The $p_{\rm T}$ 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 ($R_{\rm pPb}$) in non-single diffractive p-Pb collisions. At intermediate transverse momentum ($2 < p_{\rm T} < 10$ 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 $p_{\rm T}$ dependent structure of such increase is qualitatively similar to those observed in pp and heavy-ion collisions. At high $p_{\rm T}$ ($>10$ GeV/$c$), the particle ratios are consistent with those reported for pp and Pb-Pb collisions at the LHC energies. At intermediate $p_{\rm T}$ the (anti)proton $R_{\rm pPb}$ shows a Cronin-like enhancement, while pions and kaons show little or no nuclear modification. At high $p_{\rm T}$ the charged pion, kaon and (anti)proton $R_{\rm pPb}$ are consistent with unity within statistical and systematic uncertainties.

  • Table 1

    Data from Figure 7 (left)

    10.17182/hepdata.73749.v1/t1

    pT-differential invariant yield of charged pions in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV, measured for different V0A multiplicity classes. The...

  • Table 2

    Data from Figure 7 (left)

    10.17182/hepdata.73749.v1/t2

    pT-differential invariant yield of charged pions in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV, measured for NSD events. The first uncertainty...

  • Table 3

    Data from Figure 7 (middle)

    10.17182/hepdata.73749.v1/t3

    pT-differential invariant yield of charged kaons in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV, measured for different V0A multiplicity classes. The...

  • Table 4

    Data from Figure 7 (middle)

    10.17182/hepdata.73749.v1/t4

    pT-differential invariant yield of charged kaons in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV, measured for NSD events. The first uncertainty...

  • Table 5

    Data from Figure 7 (right)

    10.17182/hepdata.73749.v1/t5

    pT-differential invariant yield of protons+antiprotons in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV, measured for different V0A multiplicity classes. The first...

  • Table 6

    Data from Figure 7 (right)

    10.17182/hepdata.73749.v1/t6

    pT-differential invariant yield of protons+antiprotons in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV, measured for NSD events. The first uncertainty is...

  • Table 7

    Data from Figure 8 (left)

    10.17182/hepdata.73749.v1/t7

    pT-differential invariant yield of charged pions in INEL p-p collisions with centre-of-mass energies 5.02 TeV and 7.0 TeV. The first...

  • Table 8

    Data from Figure 8 (middle)

    10.17182/hepdata.73749.v1/t8

    pT-differential invariant yield of charged kaons in INEL p-p collisions with centre-of-mass energies 5.02 TeV and 7.0 TeV. The first...

  • Table 9

    Data from Figure 8 (right)

    10.17182/hepdata.73749.v1/t9

    pT-differential invariant yield of protons+antiprotons in INEL p-p collisions with centre-of-mass energies 5.02 TeV and 7.0 TeV. The first uncertainty...

  • Table 10

    Data from Figure 9

    10.17182/hepdata.73749.v1/t10

    The nuclear modification factor RPPB of charged pions, charged kaons and protons+antiprotons as a function of pT in NSD p-Pb...

  • Table 11

    Data from Figure 10 (upper panel)

    10.17182/hepdata.73749.v1/t11

    pT-dependent charged kaon to charged pion production ratios in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV, measured for different V0A multiplicity...

  • Table 12

    Data from Figure 10 (bottom panel)

    10.17182/hepdata.73749.v1/t12

    pT-dependent proton+antiproton to charged pion production ratios in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV, measured for different V0A multiplicity classes....

  • Table 13

    Data from Figure 12

    10.17182/hepdata.73749.v1/t13

    pT-integrated charged kaon to charged pion and proton+antiproton to charged pion production ratios as a function of average multiplicities in...

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