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Production of light nuclei and anti-nuclei in pp and Pb-Pb collisions at energies available at the CERN Large Hadron Collider

The ALICE collaboration
Phys.Rev. C93 (2016) 024917, 2016

Abstract (data abstract)
CERN-LHC. The production of (anti-)deuteron and (anti-)$^{3}$He nuclei in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV has been studied using the ALICE detector at the LHC. The spectra exhibit a significant hardening with increasing centrality. Combined blast-wave fits of several particles support the interpretation that this behavior is caused by an increase of radial flow. The integrated particle yields are discussed in the context of coalescence and thermal-statistical model expectations. The particle ratios, $^3$He/d and $^3$He/p, in Pb-Pb collisions are found to be in agreement with a common chemical freeze-out temperature of $T_{\rm chem} \approx 156$ MeV. These ratios do not vary with centrality which is in agreement with the thermal-statistical model. In a coalescence approach, it excludes models in which nucleus production is proportional to the particle multiplicity and favors those in which it is proportional to the particle density instead. In addition, the observation of 31 anti-tritons in Pb-Pb collisions is reported. For comparison, the deuteron spectrum in pp collisions at $\sqrt{s} = 7$ TeV is also presented.

  • Table 1

    Data from Figure 8 (deuterons all centralities)

    10.17182/hepdata.72547.v1/t1

    Anti-deuteron over deuteron ratio versus pT per nucleon for various centrality classes for Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76...

  • Table 2

    Data from Figure 8 ($^{3}$He 0-20% centrality)

    10.17182/hepdata.72547.v1/t2

    Anti-$^{3}$He over $^{3}$He ratio versus pT per nucleon for 0-20% centrality class.

  • Table 3

    Data from Figure 8 ($^{3}$He 20-80% centrality)

    10.17182/hepdata.72547.v1/t3

    Anti-$^{3}$He over $^{3}$He ratio versus pT per nucleon for 20-80% centrality class.

  • Table 4

    Data from Figure 9

    10.17182/hepdata.72547.v1/t4

    Invariant transverse momentum distribution of deuteron for various centrality classes for Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV.

  • Table 5

    Data from Figure 9

    10.17182/hepdata.72547.v1/t5

    Invariant transverse momentum distribution of deuteron for inelastic pp collisions at $\sqrt{s}$ = 7 TeV.

  • Table 6

    Data from Figure 10

    10.17182/hepdata.72547.v1/t6

    Invariant transverse momentum distribution of $^{3}$He for 0-20% and 20-80% centrality classes for Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76...

  • Table 7

    Data from Figure 16 (d to p ratio)

    10.17182/hepdata.72547.v1/t7

    d/p ratio as a function of event multiplicity.

  • Table 8

    Data from Figure 16 ($^{3}$He to p ratio)

    10.17182/hepdata.72547.v1/t8

    $^{3}$He/p ratio as a function of event multiplicity. NOTE: $^{3}$He/p ratio is divided by 150 for plotting in Fig. 16.

  • Table 9

    Data from Figure 18 (left)

    10.17182/hepdata.72547.v1/t9

    The coalescence parameters B$_{2}$ as a function of the transverse momentum per nucleon for various centrality classes for Pb-Pb collisions...

  • Table 10

    Data from Figure 18 (right)

    10.17182/hepdata.72547.v1/t10

    The coalescence parameters B$_{3}$ as a function of the transverse momentum per nucleon for 0-20% and 20-80% centrality classes for...

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