Measurement of $J/\psi$ production cross-sections in $pp$ collisions at $\sqrt{s}=5$ TeV

The collaboration
JHEP 11 (2021) 181, 2021.

Abstract (data abstract)
CERN-LHC. The production cross-sections of $J/\psi$ mesons in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=5$ TeV are measured using a data sample corresponding to an integrated luminosity of $9.13\pm0.18$ pb$^{-1}$, collected by the LHCb experiment. The cross-sections are measured differentially as a function of transverse momentum, $p_\text{T}$, and rapidity, $y$, and separately for $J/\psi$ mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised $J/\psi$ mesons, the production cross-sections integrated over the kinematic range $0<p_\text{T}<20$ GeV/$c$ and $2.0<y<4.5$ are $8.154\pm0.010\pm0.283\mu\text{b}$ for prompt $J/\psi$ mesons and $0.820\pm0.003\pm0.034\mu\text{b}$ for nonprompt $J/\psi$ mesons, where the first uncertainties are statistical and the second systematic. These cross-sections are compared with those at $\sqrt{s}=8$ TeV and 13 TeV, and are used to update the measurement of the nuclear modification factor in proton-lead collisions for $J/\psi$ mesons at a centre-of-mass energy per nucleon pair of $\sqrt{s_{NN}}=5$ TeV. The results are compared with theoretical predictions.

• Table 1

Data from Figure 2(left); Table 2

10.17182/hepdata.115512.v1/t1

Double-differential production cross-sections for prompt $J/\psi$ mesons in ($p_\text{T},y$) intervals. The first uncertainties are statistical, the second are correlated systematic...

• Table 2

Data from Figure 2(right); Table 3

10.17182/hepdata.115512.v1/t2

Double-differential production cross-sections for nonprompt $J/\psi$ mesons in ($p_\text{T},y$) intervals. The first uncertainties are statistical, the second are correlated systematic...

• Table 3

Data from Figure 3(left); Table 4

10.17182/hepdata.115512.v1/t3

Single-differential production cross-sections for prompt $J/\psi$ mesons as a function of $p_\text{T}$. The first uncertainties are statistical, the second are...

• Table 4

Data from Figure 4(left); Table 5

10.17182/hepdata.115512.v1/t4

Single-differential production cross-sections for nonprompt $J/\psi$ mesons as a function of $p_\text{T}$. The first uncertainties are statistical, the second are...

• Table 5

Data from Figure 3(right); Table 6

10.17182/hepdata.115512.v1/t5

Single-differential production cross-sections for prompt $J/\psi$ mesons as a function of $y$. The first uncertainties are statistical, the second are...

• Table 6

Data from Figure 4(right); Table 7

10.17182/hepdata.115512.v1/t6

Single-differential production cross-sections for nonprompt $J/\psi$ mesons as a function of $y$. The first uncertainties are statistical, the second are...

• Table 7

Data from Figure 5; Table 8

10.17182/hepdata.115512.v1/t7

Fraction of nonprompt $J/\psi$ mesons (in \%) in ($p_\text{T},y$) intervals. The first uncertainty is statistical and the second is systematic.

• Table 8

Data from Figure 10(left); Table 9

10.17182/hepdata.115512.v1/t8

Nuclear modification factor $R_{p\text{Pb}}$ for prompt $J/\psi$ mesons as a function of $y$. The first uncertainty is statistical and the...

• Table 9

Data from Figure 10(right); Table 9

10.17182/hepdata.115512.v1/t9

Nuclear modification factor $R_{p\text{Pb}}$ for nonprompt $J/\psi$ mesons as a function of $y$. The first uncertainty is statistical and the...

• Table 10

Data from Figure 6(left); Table 10

10.17182/hepdata.115512.v1/t10

Cross-section ratios between 8 TeV and 5 TeV measurements for prompt $J/\psi$ mesons as a function of $p_\text{T}$. The first...

• Table 11

Data from Figure 6(right); Table 11

10.17182/hepdata.115512.v1/t11

Cross-section ratios between 8 TeV and 5 TeV measurements for prompt $J/\psi$ mesons as a function of $y$. The first...

• Table 12

Data from Figure 7(left); Table 12

10.17182/hepdata.115512.v1/t12

Cross-section ratios between 13 TeV and 5 TeV measurements for prompt $J/\psi$ mesons as a function of $p_\text{T}$. The first...

• Table 13

Data from Figure 7(right); Table 13

10.17182/hepdata.115512.v1/t13

Cross-section ratios between 13 TeV and 5 TeV measurements for prompt $J/\psi$ mesons as a function of $y$. The first...

• Table 14

Data from Figure 8(left); Table 14

10.17182/hepdata.115512.v1/t14

Cross-section ratios between 8 TeV and 5 TeV measurements for nonprompt $J/\psi$ mesons as a function of $p_\text{T}$. The first...

• Table 15

Data from Figure 8(right); Table 15

10.17182/hepdata.115512.v1/t15

Cross-section ratios between 8 TeV and 5 TeV measurements for nonprompt $J/\psi$ mesons as a function of $y$. The first...

• Table 16

Data from Figure 9(left); Table 16

10.17182/hepdata.115512.v1/t16

Cross-section ratios between 13 TeV and 5 TeV measurements for nonprompt $J/\psi$ mesons as a function of $p_\text{T}$. The first...

• Table 17

Data from Figure 9(right); Table 17

10.17182/hepdata.115512.v1/t17

Cross-section ratios between 13 TeV and 5 TeV measurements for nonprompt $J/\psi$ mesons as a function of $y$. The first...

• Table 18

Table 18

10.17182/hepdata.115512.v1/t18

Relative changes of cross-sections (in \%), for a polarisation of $\lambda_{\theta}=-0.2$ rather than zero, in ($p_\text{T},y$) intervals.

• Table 19

Table 19

10.17182/hepdata.115512.v1/t19

Relative changes of cross-sections (in \%), for a polarisation of $\lambda_{\theta}=-1$ rather than zero, in ($p_\text{T},y$) intervals.

• Table 20

Table 20

10.17182/hepdata.115512.v1/t20

Relative changes of cross-sections (in \%), for a polarisation of $\lambda_{\theta}=+1$ rather than zero, in ($p_\text{T},y$) intervals.