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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