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Multi-strange baryon production in p-Pb collisions at $\sqrt{s_\mathbf{NN}}=5.02$ TeV

The ALICE collaboration
Phys.Lett. B758 (2016) 389-401, 2016

Abstract (data abstract)
CERN-LHC. The multi-strange baryon yields in Pb--Pb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, $\Xi$ and $\Omega$ production rates have been measured with the ALICE experiment as a function of transverse momentum, ${p_{\rm T}}$, in p-Pb collisions at a centre-of-mass energy of ${\sqrt{s_{\rm NN}}}$ = 5.02 TeV. The results cover the kinematic ranges 0.6 GeV/$c<{p_{\rm T}} <$7.2 GeV/$c$ and 0.8 GeV/$c<{p_{\rm T}}<$ 5 GeV/$c$, for $\Xi$ and $\Omega$ respectively, in the common rapidity interval -0.5 $<{y_{\rm CMS}}<$ 0. Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The ${p_{\rm T}}$ spectra are analysed as a function of event charged-particle multiplicity, which in p-Pb collisions ranges over one order of magnitude and lies between those observed in pp and Pb-Pb collisions. The measured ${p_{\rm T}}$ distributions are compared to the expectations from a Blast-Wave model. The parameters which describe the production of lighter hadron species also describe the hyperon spectra in high multiplicity p-Pb. The yield of hyperons relative to charged pions is studied and compared with results from pp and Pb-Pb collisions. A statistical model is employed, which describes the change in the ratios with volume using a canonical suppression mechanism, in which the small volume causes a species-dependent relative reduction of hadron production. The calculations, in which the magnitude of the effect depends on the strangeness content, show good qualitative agreement with the data.

  • Table 1

    Data from Figure 2

    10.17182/hepdata.73011.v1/t1

    Xi pt spectrum in 0-5% multiplicity class.

  • Table 2

    Data from Figure 2

    10.17182/hepdata.73011.v1/t2

    Xi pt spectrum in 5-10% multiplicity class.

  • Table 3

    Data from Figure 2

    10.17182/hepdata.73011.v1/t3

    Xi pt spectrum in 10-20% multiplicity class.

  • Table 4

    Data from Figure 2

    10.17182/hepdata.73011.v1/t4

    Xi pt spectrum in 20-40% multiplicity class.

  • Table 5

    Data from Figure 2

    10.17182/hepdata.73011.v1/t5

    Xi pt spectrum in 40-60% multiplicity class.

  • Table 6

    Data from Figure 2

    10.17182/hepdata.73011.v1/t6

    Xi pt spectrum in 60-80% multiplicity class.

  • Table 7

    Data from Figure 2

    10.17182/hepdata.73011.v1/t7

    Xi pt spectrum in 80-100% multiplicity class.

  • Table 8

    Data from Figure 2

    10.17182/hepdata.73011.v1/t8

    Omega pt spectrum in 0-5% multiplicity class.

  • Table 9

    Data from Figure 2

    10.17182/hepdata.73011.v1/t9

    Omega pt spectrum in 5-10% multiplicity class.

  • Table 10

    Data from Figure 2

    10.17182/hepdata.73011.v1/t10

    Omega pt spectrum in 10-20% multiplicity class.

  • Table 11

    Data from Figure 2

    10.17182/hepdata.73011.v1/t11

    Omega pt spectrum in 20-40% multiplicity class.

  • Table 12

    Data from Figure 2

    10.17182/hepdata.73011.v1/t12

    Omega pt spectrum in 40-60% multiplicity class.

  • Table 13

    Data from Figure 2

    10.17182/hepdata.73011.v1/t13

    Omega pt spectrum in 60-80% multiplicity class.

  • Table 14

    Data from Figure 2

    10.17182/hepdata.73011.v1/t14

    Omega pt spectrum in 80-100% multiplicity class.

  • Table 15

    Data from Figure 2

    10.17182/hepdata.73011.v1/t15

    Mean pT of XI- in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV for each V0A multiplicity event class.

  • Table 16

    Data from Figure 2

    10.17182/hepdata.73011.v1/t16

    Mean pT of XIBAR+ in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV for each V0A multiplicity event class.

  • Table 17

    Data from Figure 2

    10.17182/hepdata.73011.v1/t17

    Mean pT of OMEGA- in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV for each V0A multiplicity event class.

  • Table 18

    Data from Figure 2

    10.17182/hepdata.73011.v1/t18

    Mean pT of OMEGABAR+ in p-Pb collisions with centre-of-mass energy/nucleon=5.02 TeV for each V0A multiplicity event class.

  • Table 19

    Data from Figure 4

    10.17182/hepdata.73011.v1/t19

    XiMinus yield as a function of charged particle multiplicity per unit pseudorapidity.

  • Table 20

    Data from Figure 4

    10.17182/hepdata.73011.v1/t20

    XiPlus yield as a function of charged particle multiplicity per unit pseudorapidity.

  • Table 21

    Data from Figure 4

    10.17182/hepdata.73011.v1/t21

    OmegaMinus yield as a function of charged particle multiplicity per unit pseudorapidity.

  • Table 22

    Data from Figure 4

    10.17182/hepdata.73011.v1/t22

    OmegaPlus yield as a function of charged particle multiplicity per unit pseudorapidity.

  • Table 23

    Data from Figure 4

    10.17182/hepdata.73011.v1/t23

    Xi/pi ratio as a function of charged particle multiplicity per unit pseudorapidity.

  • Table 24

    Data from Figure 4

    10.17182/hepdata.73011.v1/t24

    Omega/pi ratio as a function of charged particle multiplicity per unit pseudorapidity.

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