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Measurement of the production of a $W$ boson in association with a charm quark in $pp$ collisions at $\sqrt{s} =$ 7 TeV with the ATLAS detector

The ATLAS collaboration
JHEP 1405 (2014) 068, 2014

Abstract (data abstract)
CERN-LHC. The production of a W boson in association with a single charm quark is studied using 4.6 fb^-1 of pp collision data at sqrt(s) = 7 TeV collected in 2011 with the ATLAS detector at the Large Hadron Collider. In events in which a W boson decays to an electron or muon, the charm quark is tagged either by its semileptonic decay to a muon or by the presence of a charmed meson. The integrated and differential cross sections as a function of the pseudorapidity of the lepton from the W-boson decay are measured. Results are compared to the predictions of next-to-leading-order QCD calculations obtained from various parton distribution function parameterisations. The ratio of the strange-to-down sea quark distributions is determined to be 0.96 +0.26,-0.30 at Q^2 = 1.9 GeV^2 which supports the hypothesis of an SU(3) symmetric composition of the light quark sea. Additionally, the cross-section ratio sigma(W^+ + cbar)/sigma(W^- + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions on the s-sbar asymmetry.

  • Table 1

    Data from T 8, F 10

    10.17182/hepdata.63197.v1/t1

    Measured integrated cross sections of the production of a W boson with a single c-jet, a D meson or a...

  • Table 2

    Data from F 12

    10.17182/hepdata.63197.v1/t2

    Measured integrated cross section ratios of the production of W+ and W- bosons associated with a single c-jet, a D...

  • Table 3

    Data from F 13

    10.17182/hepdata.63197.v1/t3

    Measured differential cross sections as function of the lepton pseudo-rapidity of the production of a W boson with a single...

  • Table 4

    Data from F 13

    10.17182/hepdata.63197.v1/t4

    Measured differential cross sections as function of the lepton pseudo-rapidity of the production of a W boson with a D...

  • Table 5

    Data from T 10

    10.17182/hepdata.63197.v1/t5

    Measured cross section ratios of the production of a W boson with a D meson or a D* meson and...

  • Table 6

    Data from F 15

    10.17182/hepdata.63197.v1/t6

    Measured differential cross section ratios of the production of a W boson with a D meson or a D* meson...

  • Table 7

    Data from T 11, F 16

    10.17182/hepdata.63197.v1/t7

    Measured integrated cross sections of the production of a W boson in association with a single c-jet and exactly zero...

  • Table 8

    Data from T 11, F 16

    10.17182/hepdata.63197.v1/t8

    Measured integrated cross sections ratio of the production of a W+ and W- bosons in association with a single c-jet...

  • Table 9

    Data from T 11

    10.17182/hepdata.63197.v1/t9

    Measured integrated cross sections of the production of a W boson in association with a single c-jet decaying into a...

  • Table 10

    Data from T 8, F 10

    10.17182/hepdata.63197.v1/t10

    Correlation matrix corresponding to the total uncertainties of measured integrated cross sections of the production of a W boson with...

  • Table 11

    Data from T 8, F 10

    10.17182/hepdata.63197.v1/t11

    Systematic uncertainties after the averaging procedure of the inclusive cross sections in different channels. The first row (labeled Uncorr.) represents...

  • Table 12

    Data from F 13

    10.17182/hepdata.63197.v1/t12

    Systematic uncertainties after the averaging procedure of the differential cross sections as function of the lepton pseudo-rapidity in different channels....

  • Table 13

    Data from F 13

    10.17182/hepdata.63197.v1/t13

    Systematic uncertainties after the averaging procedure of the differential cross sections as function of the lepton pseudo-rapidity in different channels....

  • Table 14

    Data from F 13

    10.17182/hepdata.63197.v1/t14

    Systematic uncertainties after the averaging procedure of the differential cross sections as function of the lepton pseudo-rapidity in different channels....

  • Table 15

    Data from F 13

    10.17182/hepdata.63197.v1/t15

    Systematic uncertainties after the averaging procedure of the differential cross sections as function of the lepton pseudo-rapidity in different channels....

  • Table 16

    Data from F 10

    10.17182/hepdata.63197.v1/t16

    Theoretical Predictions for the integrated cross section of the production of W+ and W- bosons associated with a single c-jet,...

  • Table 17

    Data from F 10

    10.17182/hepdata.63197.v1/t17

    PDF uncertainty for each of the used PDF sets as well as the combined parton shower, fragmentation and scale uncertainties...

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