HEPData

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
https://www.hepdata.net/record/data/561658yaml https://www.hepdata.net/record/data/561658/csvcsv
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
https://www.hepdata.net/record/data/561659yaml https://www.hepdata.net/record/data/561659/csvcsv
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
https://www.hepdata.net/record/data/561660yaml https://www.hepdata.net/record/data/561660/csvcsv
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
https://www.hepdata.net/record/data/561661yaml https://www.hepdata.net/record/data/561661/csvcsv
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
https://www.hepdata.net/record/data/561662yaml https://www.hepdata.net/record/data/561662/csvcsv
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
https://www.hepdata.net/record/data/561663yaml https://www.hepdata.net/record/data/561663/csvcsv
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
https://www.hepdata.net/record/data/561664yaml https://www.hepdata.net/record/data/561664/csvcsv
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
https://www.hepdata.net/record/data/561665yaml https://www.hepdata.net/record/data/561665/csvcsv
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
https://www.hepdata.net/record/data/561666yaml https://www.hepdata.net/record/data/561666/csvcsv
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
https://www.hepdata.net/record/data/561667yaml https://www.hepdata.net/record/data/561667/csvcsv
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 ($\langle dN_{ch}/d\eta \rangle_{|\eta|<0.5}$)
https://www.hepdata.net/record/data/561668yaml https://www.hepdata.net/record/data/561668/csvcsv
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...
https://www.hepdata.net/record/data/561669yaml https://www.hepdata.net/record/data/561669/csvcsv

Table 1

Table 2

Table 3

Table 4

Table 5

Table 6

Table 7

Table 8

Table 9

Table 10

Table 11

Table 12

JSON

YAML

YODA

ROOT

CSV

Visualize

Table 1

Table 2

Table 3

Table 4

Table 5

Table 6

Table 7

Table 8

Table 9

Table 10

Table 11

Table 12

Ask a Question

Table 1

Table 2

Table 3

Table 4

Table 5

Table 6

Table 7

Table 8

Table 9

Table 10

Table 11

Table 12

JSON YAML YODA ROOT CSV

Visualize

Ask a Question

JSON

YAML

YODA

ROOT

CSV