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Measurement of forward W and Z boson production in $pp$ collisions at $ \sqrt{s}=8 $ TeV

The LHCb collaboration
JHEP 1601 (2016) 155, 2016

Abstract (data abstract)
CERN-LHC. Measurements are presented of electroweak boson production using data from $pp$ collisions at a centre-of-mass energy of $\sqrt{s} = 8\mathrm{\,Te\kern -0.1em V}$. The analysis is based on an integrated luminosity of $2.0\mathrm{\,fb}^{-1}$ recorded with the LHCb detector. The bosons are identified in the $W\rightarrow\mu\nu$ and $Z\rightarrow\mu^{+}\mu^{-}$ decay channels. The cross-sections are measured for muons in the pseudorapidity range $2.0 < \eta < 4.5$, with transverse momenta $p_{\perp} > 20\,$GeV$/c$ and, in the case of the $Z$ boson, a dimuon mass within $60 < M_{\mu^{+}\mu^{-}} < 120\;$GeV$/c^{2}$. The results are $$ \sigma_{W^{+}\rightarrow\mu^{+}\nu} = 1093.6 \pm 2.1 \pm 7.2 \pm 10.9 \pm 12.7{\rm \,pb}\; , $$ $$ \sigma_{W^{-}\rightarrow\mu^{-}\bar{\nu}} = 818.4 \pm 1.9 \pm 5.0 \pm 7.0 \pm 9.5{\rm \,pb} \, , $$ $$ \sigma_{Z\rightarrow\mu^{+}\mu^{-}} = 95.0 \pm 0.3 \pm 0.7 \pm 1.1 \pm 1.1{\rm \,pb} \, , $$ where the first uncertainties are statistical, the second are systematic, the third are due to the knowledge of the LHC beam energy and the fourth are due to the luminosity determination. The evolution of the $W$ and $Z$ boson cross-sections with centre-of-mass energy is studied using previously reported measurements with $1.0$ fb$^{-1}$ of data at $7\,$TeV. Differential distributions are also presented. Results are in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics.

  • Table 1

    Data from T 4

    10.17182/hepdata.71419.v1/t1

    Inclusive cross-section for $W^+$ and $W^-$ boson production in bins of muon pseudorapidity. The uncertainties are statistical, systematic, beam and...

  • Table 2

    Data from T 5

    10.17182/hepdata.71419.v1/t2

    Inclusive cross-section for $Z$ boson production in bins of rapidity. The uncertainties are statistical, systematic, beam and luminosity.

  • Table 3

    Data from T 6

    10.17182/hepdata.71419.v1/t3

    Inclusive cross-section for $Z$ boson production in bins of transverse momentum. The uncertainties are statistical, systematic, beam and luminosity.

  • Table 4

    Data from T 7

    10.17182/hepdata.71419.v1/t4

    Inclusive cross-section for $Z$ boson production in bins of PHI*. The uncertainties are statistical, systematic, beam and luminosity.

  • Table 5

    Data from T 8

    10.17182/hepdata.71419.v1/t5

    Inclusive cross-section for $Z$ boson production in bins of muon pseudorapidity. The uncertainties are statistical, systematic, beam and luminosity.

  • Table 6

    Data from T 9

    10.17182/hepdata.71419.v1/t6

    $W^{\pm}$ to $Z$ boson cross-section ratio in bins of muon pseudorapidity. The uncertainties are statistical, systematic, beam and luminosity.

  • Table 7

    Data from T 10

    10.17182/hepdata.71419.v1/t7

    Ratio of $W^+$ to $W^-$ cross-section in bins of muon pseudorapidity. The uncertainties are statistical, systematic and beam.

  • Table 8

    Data from T 11

    10.17182/hepdata.71419.v1/t8

    Lepton charge asymmetry in bins of muon pseudorapidity. The uncertainties are statistical, systematic and beam.

  • Table 9

    Data from T 12

    10.17182/hepdata.71419.v1/t9

    Ratios of $W^{\pm}$ to $Z$ boson cross-section ratios at differnent centre-of-mass energy (8 TeV to 7 TeV) in bins of...

  • Table 10

    Data from T 13

    10.17182/hepdata.71419.v1/t10

    Inclusive cross-section for $Z$ boson production in bins of muon pseudorapidity at centre-of-mass energy of 7 TeV. The uncertainties are...

  • Table 11

    Data from T 14

    10.17182/hepdata.71419.v1/t11

    $W^{\pm}$ to $Z$ boson cross-section ratio in bins of muon pseudorapidity at centre-of-mass energy of 7 TeV. The uncertainties are...

  • Table 12

    Data from T 15

    10.17182/hepdata.71419.v1/t12

    Correlation coefficients of differential cross-section measurements as a function of lepton $\eta$. The beam energy and luminosity uncertainties, which are...

  • Table 13

    Data from T 15

    10.17182/hepdata.71419.v1/t13

    Correlation coefficients of differential cross-section measurements as a function of lepton $\eta$. The beam energy and luminosity uncertainties, which are...

  • Table 14

    Data from T 15

    10.17182/hepdata.71419.v1/t14

    Correlation coefficients of differential cross-section measurements as a function of lepton $\eta$. The beam energy and luminosity uncertainties, which are...

  • Table 15

    Data from T 16

    10.17182/hepdata.71419.v1/t15

    Correlation coefficients of differential cross-section measurements as a function of $y_{Z}$. The beam energy and luminosity uncertainties, which are fully...

  • Table 16

    Data from T 17

    10.17182/hepdata.71419.v1/t16

    Correlation coefficients of differential cross-section measurements as a function of transverse momentum. The beam energy and luminosity uncertainties, which are...

  • Table 17

    Data from T 18

    10.17182/hepdata.71419.v1/t17

    Correlation coefficients of differential cross-section measurements as a function of $\phi^{*}$. The beam energy and luminosity uncertainties, which are fully...

  • Table 18

    Data from T 19

    10.17182/hepdata.71419.v1/t18

    Correlation coefficients between differential cross-section measurements as a function $y_{Z}$ and $W^{+}$ boson muon $\eta$. The beam energy and luminosity...

  • Table 19

    Data from T 19

    10.17182/hepdata.71419.v1/t19

    Correlation coefficients between differential cross-section measurements as a function $y_{Z}$ and $W^{-}$ boson muon $\eta$. The beam energy and luminosity...

  • Table 20

    Data from T 20

    10.17182/hepdata.71419.v1/t20

    Correlation coefficients of differential cross-section measurements as a function of $\eta^{\mu^{+}}$ of the Z boson. The beam energy and luminosity...

  • Table 21

    Data from T 20

    10.17182/hepdata.71419.v1/t21

    Correlation coefficients of differential cross-section measurements as a function of $\eta^{\mu^{-}}$ of the Z boson. The beam energy and luminosity...

  • Table 22

    Data from T 21

    10.17182/hepdata.71419.v1/t22

    Correlation coefficients of differential cross-section measurements as a function of $\eta^{\mu^{+}}$. The beam energy and luminosity uncertainties, which are fully...

  • Table 23

    Data from T 21

    10.17182/hepdata.71419.v1/t23

    Correlation coefficients of differential cross-section measurements as a function of $\eta^{\mu^{-}}$. The beam energy and luminosity uncertainties, which are fully...

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