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Production of light (anti)nuclei in pp collisions at $\sqrt{s} = 13$TeV

The collaboration
CERN-EP-2021-194, 2021.

Abstract (data abstract)
Understanding the production mechanism of light (anti)nuclei is one of the key challenges of nuclear physics and has important consequences for astrophysics, since it provides an input for indirect dark-matter searches in space. In this paper, the latest results about the production of light (anti)nuclei in pp collisions at \s $= 13$~TeV are presented, focusing on the comparison with the predictions of coalescence and thermal models. For the first time, the coalescence parameters $B_2$ for deuterons and $B_3$ for helions are compared with parameter-free theoretical predictions that are directly constrained by the femtoscopic measurement of the source radius in the same event class. A fair description of the data with a Gaussian wave function is observed for both deuteron and helion, supporting the coalescence mechanism for the production of light (anti)nuclei in pp collisions. This method paves the way for future investigations of the internal structure of more complex nuclear clusters, including the hypertriton.

• #### (Anti)proton spectrum in HM V0M multiplicity class

Data from Figure 1 (top-left).

10.17182/hepdata.115571.v1/t1

(Anti)proton spectrum in HM V0M multiplicity class

• #### (Anti)proton spectrum in HM I V0M multiplicity class

Data from Figure 1 (top-left).

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(Anti)proton spectrum in HM I V0M multiplicity class

• #### (Anti)proton spectrum in HM II V0M multiplicity class

Data from Figure 1 (top-left).

10.17182/hepdata.115571.v1/t3

(Anti)proton spectrum in HM II V0M multiplicity class

• #### (Anti)proton spectrum in HM III V0M multiplicity class

Data from Figure 1 (top-left).

10.17182/hepdata.115571.v1/t4

(Anti)proton spectrum in HM III V0M multiplicity class

• #### (Anti)deuteron spectrum in HM I V0M multiplicity class

Data from Figure 1 (bottom-left).

10.17182/hepdata.115571.v1/t5

(Anti)deuteron spectrum in HM I V0M multiplicity class

• #### (Anti)deuteron spectrum in HM II V0M multiplicity class

Data from Figure 1 (bottom-left).

10.17182/hepdata.115571.v1/t6

(Anti)deuteron spectrum in HM II V0M multiplicity class

• #### (Anti)deuteron spectrum in HM III V0M multiplicity class

Data from Figure 1 (bottom-left).

10.17182/hepdata.115571.v1/t7

(Anti)deuteron spectrum in HM III V0M multiplicity class

• #### (Anti)triton spectrum in HM V0M multiplicity class

Data from Figure 1 (bottom-right).

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(Anti)triton spectrum in HM V0M multiplicity class

• #### (Anti)triton spectrum in MB V0M multiplicity class

Data from Figure 1 (bottom-right).

10.17182/hepdata.115571.v1/t9

(Anti)triton spectrum in MB V0M multiplicity class

• #### (Anti)helion spectrum in HM V0M multiplicity class

Data from Figure 1 (top-right).

10.17182/hepdata.115571.v1/t10

(Anti)helion spectrum in HM V0M multiplicity class

• #### (Anti)helion spectrum in MB V0M multiplicity class

Data from Figure 1 (top-right).

10.17182/hepdata.115571.v1/t11

(Anti)helion spectrum in MB V0M multiplicity class

• #### (Anti)helion spectrum in MB I V0M multiplicity class

Data from Figure 1 (top-right).

10.17182/hepdata.115571.v1/t12

(Anti)helion spectrum in MB I V0M multiplicity class

• #### (Anti)helion spectrum in MB II V0M multiplicity class

Data from Figure 1 (top-right).

10.17182/hepdata.115571.v1/t13

(Anti)helion spectrum in MB II V0M multiplicity class

• #### $B_2$ in HM I V0M multiplicity class

Data from Figure 2 (left).

10.17182/hepdata.115571.v1/t14

Coalescence parameter $B_2$ as a function of $p_{\mathrm{T}}$ in HM I V0M multiplicity class

• #### $B_2$ in HM II V0M multiplicity class

Data from Figure 2 (left).

10.17182/hepdata.115571.v1/t15

Coalescence parameter $B_2$ as a function of $p_{\mathrm{T}}$ in HM II V0M multiplicity class

• #### $B_2$ in HM III V0M multiplicity class

Data from Figure 2 (left).

10.17182/hepdata.115571.v1/t16

Coalescence parameter $B_2$ as a function of $p_{\mathrm{T}}$ in HM III V0M multiplicity class

• #### $B_3$ in HM V0M multiplicity class

Data from Figure 2 (right).

10.17182/hepdata.115571.v1/t17

Coalescence parameter $B_3$ as a function of $p_{\mathrm{T}}$ in HM V0M multiplicity class

• #### $B_3$ in MB V0M multiplicity class

Data from Figure 2 (right).

10.17182/hepdata.115571.v1/t18

Coalescence parameter $B_3$ as a function of $p_{\mathrm{T}}$ in MB V0M multiplicity class

• #### $B_3$ in MB I V0M multiplicity class

Data from Figure 2 (right).

10.17182/hepdata.115571.v1/t19

Coalescence parameter $B_3$ as a function of $p_{\mathrm{T}}$ in MB I V0M multiplicity class

• #### $B_3$ in MB II V0M multiplicity class

Data from Figure 2 (right).

10.17182/hepdata.115571.v1/t20

Coalescence parameter $B_3$ as a function of $p_{\mathrm{T}}$ in MB II V0M multiplicity class

• #### deuteron_over_proton

Data from Figure 6 (left).

10.17182/hepdata.115571.v1/t21

Deuteron over proton ratio in high-multiplicity pp collisions as a function of the charged particle multiplicity density at mid-rapidity

• #### helion_over_proton_mb

Data from Figure 6 (right).

10.17182/hepdata.115571.v1/t22

Helion over proton ratio in minimum-bias pp collisions as a function of the charged particle multiplicity density at mid-rapidity

• #### helion_over_proton_hm

Data from Figure 6 (right).

10.17182/hepdata.115571.v1/t23

Helion over proton ratio in high-multiplicity pp collisions as a function of the charged particle multiplicity density at mid-rapidity

• #### triton_over_helion

Data from Figure 4.

10.17182/hepdata.115571.v1/t24

Triton over helion ratio in high-multiplicity pp collisions as a function of the transverse momentum