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$K^0_S$ and $\Lambda$ production in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

The ALICE collaboration
Phys.Rev.Lett. 111 (2013) 222301, 2013

Abstract (data abstract)
CERN-LHC. The ALICE measurement of K$^0_{\rm S}$ and $\rm\Lambda$ production at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV is presented. The transverse momentum ($p_{\rm T}$) spectra are shown for several collision centrality intervals and in the $p_{\rm T}$ range from 0.4 GeV/$c$ (0.6 GeV/$c$ for $\rm\Lambda$) to 12 GeV/$c$. The $p_{\rm T}$ dependence of the $\rm \Lambda$/K$^0_{\rm S}$ ratios exhibits maxima in the vicinity of 3 GeV/$c$, and the positions of the maxima shift towards higher $p_{\rm T}$ with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate $p_{\rm T}$ is not observed in pp interactions at sqrt(s) = 0.9 TeV and at sqrt(s) = 7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured $p_{\rm T}$ spectra above 2 GeV/$c$ progressively decouple from hydrodynamical-model calculations. For higher values of $p_{\rm T}$, models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the $p_{\rm T}$ dependence of the $\rm\Lambda$/K$^0_{\rm S}$ ratio Note:(Update APR 2016) total integrated mid-rapidity yields for Lambda and K0s added.

  • Table 1

    Data from Figure 2

    10.17182/hepdata.61857.v1/t1

    pT spectra of K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 0.0-5.0%.

  • Table 2

    Data from Figure 2

    10.17182/hepdata.61857.v1/t2

    pT spectra of K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 5.0-10.0%.

  • Table 3

    Data from Figure 2

    10.17182/hepdata.61857.v1/t3

    pT spectra of K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 10.0-20.0%.

  • Table 4

    Data from Figure 2

    10.17182/hepdata.61857.v1/t4

    pT spectra of K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 20.0-40.0%.

  • Table 5

    Data from Figure 2

    10.17182/hepdata.61857.v1/t5

    pT spectra of K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 40.0-60.0%.

  • Table 6

    Data from Figure 2

    10.17182/hepdata.61857.v1/t6

    pT spectra of K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 60.0-80.0%.

  • Table 7

    Data from Figure 2

    10.17182/hepdata.61857.v1/t7

    pT spectra of K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 80.0-90.0%.

  • Table 8

    Data from Figure 2

    10.17182/hepdata.61857.v1/t8

    pT spectra of Lambda in the rapidity range -0.5<y<0.5 in the centrality interval 0.0-5.0%.

  • Table 9

    Data from Figure 2

    10.17182/hepdata.61857.v1/t9

    pT spectra of Lambda in the rapidity range -0.5<y<0.5 in the centrality interval 5.0-10.0%.

  • Table 10

    Data from Figure 2

    10.17182/hepdata.61857.v1/t10

    pT spectra of Lambda in the rapidity range -0.5<y<0.5 in the centrality interval 10.0-20.0%.

  • Table 11

    Data from Figure 2

    10.17182/hepdata.61857.v1/t11

    pT spectra of Lambda in the rapidity range -0.5<y<0.5 in the centrality interval 20.0-40.0%.

  • Table 12

    Data from Figure 2

    10.17182/hepdata.61857.v1/t12

    pT spectra of Lambda in the rapidity range -0.5<y<0.5 in the centrality interval 40.0-60.0%.

  • Table 13

    Data from Figure 2

    10.17182/hepdata.61857.v1/t13

    pT spectra of Lambda in the rapidity range -0.5<y<0.5 in the centrality interval 60.0-80.0%.

  • Table 14

    Data from Figure 2

    10.17182/hepdata.61857.v1/t14

    pT spectra of Lambda in the rapidity range -0.5<y<0.5 in the centrality interval 80.0-90.0%.

  • Table 15

    Data from Figure 3

    10.17182/hepdata.61857.v1/t15

    Ratio of Lambda/K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 0.0-5.0%.

  • Table 16

    Data from Figure 3

    10.17182/hepdata.61857.v1/t16

    Ratio of Lambda/K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 5.0-10.0%.

  • Table 17

    Data from Figure 3

    10.17182/hepdata.61857.v1/t17

    Ratio of Lambda/K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 10.0-20.0%.

  • Table 18

    Data from Figure 3

    10.17182/hepdata.61857.v1/t18

    Ratio of Lambda/K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 20.0-40.0%.

  • Table 19

    Data from Figure 3

    10.17182/hepdata.61857.v1/t19

    Ratio of Lambda/K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 40.0-60.0%.

  • Table 20

    Data from Figure 3

    10.17182/hepdata.61857.v1/t20

    Ratio of Lambda/K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 60.0-80.0%.

  • Table 21

    Data from Figure 3

    10.17182/hepdata.61857.v1/t21

    Ratio of Lambda/K0Short in the rapidity range -0.5<y<0.5 in the centrality interval 80.0-90.0%.

  • Table 22

    Data from Table 1

    10.17182/hepdata.61857.v1/t22

    Total integrated mid-rapidity yields for K0Short in the rapidity range -0.5<y<0.5 for different centrality intervals. For each centrality interval, the...

  • Table 23

    Data from Table 1

    10.17182/hepdata.61857.v1/t23

    Total integrated mid-rapidity yields for LAMBDA in the rapidity range -0.5<y<0.5 for different centrality intervals. For each centrality interval, the...

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