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Multiplicity dependence of (anti-)deuteron production in pp collisions at $\sqrt{s}$ = 7 TeV

The ALICE collaboration
Phys.Lett. B794 (2019) 50-63, 2019

Abstract (data abstract)
In this letter, the production of deuterons and anti-deuterons in pp collisions at $\sqrt{s}$ = 7 TeV is studied as a function of the charged-particle multiplicity density at mid-rapidity with the ALICE detector at the LHC. Production yields are measured at mid-rapidity in five multiplicity classes and as a function of the deuteron transverse momentum (pT). The measurements are discussed in the context of hadron-coalescence models. The coalescence parameter B2, extracted from the measured spectra of (anti-)deuterons and primary (anti-)protons, exhibits no significant pT-dependence for pT < 3 GeV/c, in agreement with the expectations of a simple coalescence picture. At fixed transverse momentum per nucleon, the B2 parameter is found to decrease smoothly from low multiplicity pp to Pb-Pb collisions, in qualitative agreement with more elaborate coalescence models. The measured mean transverse momentum of (anti-)deuterons in pp is not reproduced by the Blast-Wave model calculations that simultaneously describe pion, kaon and proton spectra, in contrast to central Pb-Pb collisions. The ratio between the pT-integrated yield of deuterons to protons, d/p, is found to increase with the charged-particle multiplicity, as observed in inelastic pp collisions at different centre-of-mass energies. The d/p ratios are reported in a wide range, from the lowest to the highest multiplicity values measured in pp collisions at the LHC.

  • Table 1

    Fig. 2

    10.17182/hepdata.93741.v1/t1

    Transverse-momentum spectra of deuterons and anti-deuterons measured at mid-rapidity in V0M multiplicity class I+II

  • Table 2

    Fig. 2

    10.17182/hepdata.93741.v1/t2

    Transverse-momentum spectra of deuterons and anti-deuterons measured at mid-rapidity in V0M multiplicity class III

  • Table 3

    Fig. 2

    10.17182/hepdata.93741.v1/t3

    Transverse-momentum spectra of deuterons and anti-deuterons measured at mid-rapidity in V0M multiplicity class IV+V

  • Table 4

    Fig. 2

    10.17182/hepdata.93741.v1/t4

    Transverse-momentum spectra of deuterons and anti-deuterons measured at mid-rapidity in V0M multiplicity class VI+VII

  • Table 5

    Fig. 2

    10.17182/hepdata.93741.v1/t5

    Transverse-momentum spectra of deuterons and anti-deuterons measured at mid-rapidity in V0M multiplicity class VIII+IX+X

  • Table 6

    Fig. 4

    10.17182/hepdata.93741.v1/t6

    Coalescence parameter $B_2$ of (anti-)deuterons vs. the transverse momentum per nucleon in V0M multiplicity class I+II

  • Table 7

    Fig. 4

    10.17182/hepdata.93741.v1/t7

    Coalescence parameter $B_2$ of (anti-)deuterons vs. the transverse momentum per nucleon in V0M multiplicity class III

  • Table 8

    Fig. 4

    10.17182/hepdata.93741.v1/t8

    Coalescence parameter $B_2$ of (anti-)deuterons vs. the transverse momentum per nucleon in V0M multiplicity class IV+V

  • Table 9

    Fig. 4

    10.17182/hepdata.93741.v1/t9

    Coalescence parameter $B_2$ of (anti-)deuterons vs. the transverse momentum per nucleon in V0M multiplicity class VI+VII

  • Table 10

    Fig. 4

    10.17182/hepdata.93741.v1/t10

    Coalescence parameter $B_2$ of (anti-)deuterons vs. the transverse momentum per nucleon in V0M multiplicity class VIII+IX+X

  • Table 11

    Fig. 7

    10.17182/hepdata.93741.v1/t11

    Mean transverse momentum ($\langle p_T \rangle$) of (anti-)deuterons as a function of charged-particle multiplicity at mid-rapidity ($\langle dN_{ch}/d\eta \rangle_{|\eta|<0.5}$)

  • Table 12

    Fig. 8

    10.17182/hepdata.93741.v1/t12

    Ratio between the $p_T$-integrated yield of deuterons and protons (d/p) as a function of charged-particle multiplicity at mid-rapidity ($\langle dN_{ch}/d\eta...

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