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

The collaboration
JHEP 01 (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...