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Multiplicity dependence of light (anti-)nuclei production in p-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV

The collaboration
2019.

Abstract (data abstract)
The measurement of the deuteron and anti-deuteron production in the rapidity range $-1 < y < 0$ as a function of transverse momentum and event multiplicity in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV is presented. (Anti-)deuterons are identified via their specific energy loss $\mathrm{d}E/\mathrm{d}x$ and via their time-of-flight. Their production in p-Pb collisions is compared to pp and Pb-Pb collisions and is discussed within the context of thermal and coalescence models. The ratio of integrated yields of deuterons to protons (d/p) shows a significant increase as a function of the charged-particle multiplicity of the event starting from values similar to those observed in pp collisions at low multiplicities and approaching those observed in Pb-Pb collisions at high multiplicities. The mean transverse momenta are extracted from the deuteron spectra and the values are similar to those obtained for p and $\Lambda$ particles. Thus, deuteron spectra do not follow mass ordering.This behaviour is in contrast to the trend observed for non-composite particles in p-Pb collisions. In addition, the production of the rare $^{3}{\mathrm{He}}$ and $^{3}\overline{\rm He}$ nuclei has been studied. The spectrum corresponding to all non-single diffractive p-Pb collisions is obtained in the rapidity window $-1 < y < 0$ and the $p_{\mathrm{T}}$-integrated yield d$N$/d$y$ is extracted. It is found that the yields of protons, deuterons, and $^{3}{\mathrm{He}}$, normalised by the spin degeneracy factor, follow an exponential decrease with mass number.

• #### 1-deuterons_0

Data from Figure 3 (left), located on page 6.

10.17182/hepdata.92019.v1/t1

Transverse momentum distributions of deuterons in the 0-10% V0A multiplicity class

• #### 2-deuterons_1

Data from Figure 3 (left), located on page 6.

10.17182/hepdata.92019.v1/t2

Transverse momentum distributions of deuterons in the 10-20% V0A multiplicity class

• #### 3-deuterons_2

Data from Figure 3 (left), located on page 6.

10.17182/hepdata.92019.v1/t3

Transverse momentum distributions of deuterons in the 20-40% V0A multiplicity class

• #### 4-deuterons_3

Data from Figure 3 (left), located on page 6.

10.17182/hepdata.92019.v1/t4

Transverse momentum distributions of deuterons in the 40-60% V0A multiplicity class

• #### 5-deuterons_4

Data from Figure 3 (left), located on page 6.

10.17182/hepdata.92019.v1/t5

Transverse momentum distributions of deuterons in the 60-100% V0A multiplicity class

• #### 6-antideuterons_0

Data from Figure 3 (right), located on page 6.

10.17182/hepdata.92019.v1/t6

Transverse momentum distributions of anti-deuterons in the 0-10% V0A multiplicity class

• #### 7-antideuterons_1

Data from Figure 3 (right), located on page 6.

10.17182/hepdata.92019.v1/t7

Transverse momentum distributions of anti-deuterons in the 10-20% V0A multiplicity class

• #### 8-antideuterons_2

Data from Figure 3 (right), located on page 6.

10.17182/hepdata.92019.v1/t8

Transverse momentum distributions of anti-deuterons in the 20-40% V0A multiplicity class

• #### 9-antideuterons_3

Data from Figure 3 (right), located on page 6.

10.17182/hepdata.92019.v1/t9

Transverse momentum distributions of anti-deuterons in the 40-60% V0A multiplicity class

• #### 10-antideuterons_4

Data from Figure 3 (right), located on page 6.

10.17182/hepdata.92019.v1/t10

Transverse momentum distributions of anti-deuterons in the 60-100% V0A multiplicity class

• #### 11-ratio_0

Data from Figure 4, located on page 7.

10.17182/hepdata.92019.v1/t11

$\bar{d}$/d ratio as a function of transverse momentum in the 0-10% V0A multiplicity class

• #### 12-ratio_1

Data from Figure 4, located on page 7.

10.17182/hepdata.92019.v1/t12

$\bar{d}$/d ratio as a function of transverse momentum in the 10-20% V0A multiplicity class

• #### 13-ratio_2

Data from Figure 4, located on page 7.

10.17182/hepdata.92019.v1/t13

$\bar{d}$/d ratio as a function of transverse momentum in the 20-40% V0A multiplicity class

• #### 14-ratio_3

Data from Figure 4, located on page 7.

10.17182/hepdata.92019.v1/t14

$\bar{d}$/d ratio as a function of transverse momentum in the 40-60% V0A multiplicity class

• #### 15-ratio_4

Data from Figure 4, located on page 7.

10.17182/hepdata.92019.v1/t15

$\bar{d}$/d ratio as a function of transverse momentum in the 60-100% V0A multiplicity class

• #### 16-Anti3He

Data from Figure 5, located on page 9.

10.17182/hepdata.92019.v1/t16

Transverse momentum distribution of $^{3}\overline{\mathrm{He}}$ for all non single diffractive (NSD) p-Pb collisions.

• #### 17-3He

Data from Figure 5, located on page 9.

10.17182/hepdata.92019.v1/t17

Transverse momentum distribution of $^{3}\mathrm{He}$ for all non single diffractive (NSD) p-Pb collisions.

• #### 18-PenaltyFactor

Data from Figure 6, located on page 9.

10.17182/hepdata.92019.v1/t18

Integrated yield of nuclei produced in NSD p-Pb collisions normalised by the spin degeneracy factor as a function of the...

• #### 19-B2_1

Data from Figure 7, located on page 10.

10.17182/hepdata.92019.v1/t19

Coalescence parameter $B_2$ as a function of $p_{\mathrm{T}}$ in the 0-10% V0A multiplicity class

• #### 20-B2_2

Data from Figure 7, located on page 10.

10.17182/hepdata.92019.v1/t20

Coalescence parameter $B_2$ as a function of $p_{\mathrm{T}}$ in the 10-20% V0A multiplicity class

• #### 21-B2_3

Data from Figure 7, located on page 10.

10.17182/hepdata.92019.v1/t21

Coalescence parameter $B_2$ as a function of $p_{\mathrm{T}}$ in the 20-40% V0A multiplicity class

• #### 22-B2_4

Data from Figure 7, located on page 10.

10.17182/hepdata.92019.v1/t22

Coalescence parameter $B_2$ as a function of $p_{\mathrm{T}}$ in the 40-60% V0A multiplicity class

• #### 23-B2_5

Data from Figure 7, located on page 10.

10.17182/hepdata.92019.v1/t23

Coalescence parameter $B_2$ as a function of $p_{\mathrm{T}}$ in the 60-100% V0A multiplicity class

• #### 24-MeanPt

Data from Figure 8, located on page 11.

10.17182/hepdata.92019.v1/t24

Mean transverse momentum of deuteron produced in p-Pb collisions as a function of the charged particle multiplicity density ad mid-rapidity

• #### 25-DoverP

Data from Figure 9, located on page 12.

10.17182/hepdata.92019.v1/t25

Deuteron over proton ratio in p-Pb collisions as a function of the charged particle multiplicity density ad mid-rapidity