Measurement of $Z$ boson production cross-section in $pp$ collisions at $\sqrt{s} = 5.02$ TeV

The LHCb collaboration
JHEP 02 (2024) 070, 2024.

Abstract
The first measurement of the $Z$ boson production cross-section at centre-of-mass energy $\sqrt{s} = 5.02\,$TeV in the forward region is reported, using $pp$ collision data collected by the LHCb experiment in year 2017, corresponding to an integrated luminosity of $100 \pm 2\,\rm{pb^{-1}}$. The production cross-section is measured for final-state muons in the pseudorapidity range $2.0<\eta<4.5$ with transverse momentum $p_{\rm{T}}> 20\,\rm{GeV/}\it{c}$. The integrated cross-section is determined to be \[ \sigma_{Z \rightarrow \mu^{+}\mu^{-}} = 39.6 \pm 0.7\,(\rm{stat}) \pm 0.6\,(\rm{syst}) \pm 0.8\,(\rm{lumi}) \ \rm{pb} \] for the di-muon invariant mass in the range $60<M_{\mu\mu}<120\,\rm{GeV/}\it{c^{2}}$. This result and the differential cross-section results are in good agreement with theoretical predictions at next-to-next-to-leading order in the strong coupling. Based on a previous LHCb measurement of the $Z$ boson production cross-section in $p$Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV, the nuclear modification factor $R_{p\rm{Pb}}$ is measured for the first time at this energy. The measured values are $1.2^{+0.5}_{-0.3}\,(\rm{stat}) \pm 0.1\,(\rm{syst})$ in the forward region ($1.53<y^*_{\mu}<4.03$) and $3.6^{+1.6}_{-0.9}\,(\rm{stat}) \pm 0.2\,(\rm{syst})$ in the backward region ($-4.97<y^*_{\mu}<-2.47$), where $y^*_{\mu}$ represents the muon rapidity in the centre-of-mass frame.

  • Table7

    10.17182/hepdata.147274.v2/t1

    Systematic uncertainties on the single differential cross-sections in bins of $y^{Z}$, presented in percentage.

  • Table8

    10.17182/hepdata.147274.v2/t2

    Systematic uncertainties on the single differential cross-sections in bins of $p_{T}^{Z}$, presented in percentage.

  • Table9

    10.17182/hepdata.147274.v2/t3

    Systematic uncertainties on the single differential cross-sections in bins of $\phi_{\eta}^{*}$, presented in percentage.

  • Table10

    10.17182/hepdata.147274.v2/t4

    Measured single differential cross-sections in bins of $y^{Z}$. The first uncertainty is statistical, the second systematic, and the third is...

  • Table11

    10.17182/hepdata.147274.v2/t5

    Measured single differential cross-sections in bins of $p_{T}^{Z}$. The first uncertainty is statistical, the second systematic, and the third is...

  • Table12

    10.17182/hepdata.147274.v2/t6

    Measured single differential cross-sections in bins of $\phi_{\eta}^{*}$. The first uncertainty is statistical, the second systematic, and the third is...

  • Table13

    10.17182/hepdata.147274.v2/t7

    Statistical correlation matrix for the one-dimensional $y^{Z}$ measurement.

  • Table14

    10.17182/hepdata.147274.v2/t8

    Statistical correlation matrix for the one-dimensional $p_{T}^{Z}$ measurement.

  • Table15

    10.17182/hepdata.147274.v2/t9

    Statistical correlation matrix for the one-dimensional $\phi_{\eta}^{*}$ measurement.

  • Table16

    10.17182/hepdata.147274.v2/t10

    Correlation matrix for the efficiency uncertainty of the one-dimensional $y^{Z}$ measurement.

  • Table17

    10.17182/hepdata.147274.v2/t11

    Correlation matrix for the efficiency uncertainty of the one-dimensional $p_{T}^{Z}$ measurement.

  • Table18

    10.17182/hepdata.147274.v2/t12

    Correlation matrix for the efficiency uncertainty of the one-dimensional $\phi_{\eta}^{*}$ measurement.

Version 2 modifications: Added tables with detailed systematic uncertainties.

Loading Data...

Ask a Question


Your question will be emailed to those involved with the submission. Please mention the relevant table.


Please log in to HEPData to send a question.