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Measurement of differential production cross-sections for a $Z$ boson in association with $b$-jets in 7 TeV proton-proton collisions with the ATLAS detector

The ATLAS collaboration
JHEP 1410 (2014) 141, 2014

Abstract (data abstract)
CERN-LHC. Measurements of differential production cross-sections of a Z boson in association with b-jets in pp collisions at sqrt(s) = 7 TeV are reported. The data analysed correspond to an integrated luminosity of 4.6 fb^{-1} recorded in 2011 with the ATLAS detector at the Large Hadron Collider. Particle-level cross-sections are determined for events with a Z boson decaying into an electron or muon pair, and containing b-jets. For events with at least one b-jet, the cross-section is presented as a function of the Z boson transverse momentum and rapidity, together with the inclusive b-jet cross-section as a function of b-jet transverse momentum, rapidity and angular separations between the b-jet and the Z boson. For events with at least two b-jets, the cross-section is deter mined as a function of the invariant mass and angular separation of the two highest transverse momentum b-jets, and as a function of the Z boson transverse momentum and rapidity. Theoretical non-perturbative corrections for the differential cross-sections are given in the tables below as multiplicative correction factors applied to parton-level theory predictions from MCFM to account for the softening of the jet spectra due to fragmentation and hadronisation and to the enhancement of the cross-section due to multi-parton interactions (MPI). A constant QED multiplicative factor, correcting the born lepton definition in MCFM to the dressed definition used in the analysis, is included. The various sources of uncertainties (MC sample size, differences between PYTHIA and SHERPA in the modelling of NP-QCD effects, QED final state radiation (FSR) correction and uncertainties on the modelling of the double parton interaction from a comparison to data) are listed separately.

  • Table 1

    Data from Table 4 and Figure 6a

    10.17182/hepdata.65389.v1/t1

    Integrated $Z+\ge 1$ $b$-jet cross-section and the integrated inclusive $b$-jet cross-sections.

  • Table 2

    Data from Table 4 and Figure 6a

    10.17182/hepdata.65389.v1/t2

    Breakdown of systematic uncertainties (in %) for the integrated $Z+\ge 1$ $b$-jet cross-section and the integrated inclusive $b$-jet cross-sections.

  • Table 3

    Data from Figure 7a

    10.17182/hepdata.65389.v1/t3

    The inclusive $b$-jet cross-section $\sigma(Zb)\times N_{b\text{-jet}}$ as a function of $b$-jet $p_T$ together with the corresponding non-perturbative corrections.

  • Table 4

    Data from Figure 7a

    10.17182/hepdata.65389.v1/t4

    Breakdown of systematic uncertainties (in %) for the inclusive $b$-jet cross-section $\sigma(Zb)\times N_{b\text{-jet}}$ as a function of $b$-jet $p_T$.

  • Table 5

    Data from Figure 7b

    10.17182/hepdata.65389.v1/t5

    The inclusive $b$-jet cross-section $\sigma(Zb)\times N_{b\text{-jet}}$ as a function of $b$-jet $|y|$ together with the corresponding non-perturbative corrections.

  • Table 6

    Data from Figure 7b

    10.17182/hepdata.65389.v1/t6

    Breakdown of systematic uncertainties (in %) for the inclusive $b$-jet cross-section $\sigma(Zb)\times N_{b\text{-jet}}$ as a function of $b$-jet $|y|$.

  • Table 7

    Data from Figure 9b

    10.17182/hepdata.65389.v1/t7

    The inclusive $b$-jet cross-section $\sigma(Zb)\times N_{b\text{-jet}}$ as a function of $y_{\text{boost}}(Z,b)$ together with the corresponding non-perturbative corrections.

  • Table 8

    Data from Figure 9b

    10.17182/hepdata.65389.v1/t8

    Breakdown of systematic uncertainties (in %) for the inclusive $b$-jet cross-section $\sigma(Zb)\times N_{b\text{-jet}}$ as a function of $y_{\text{boost}}(Z,b)$.

  • Table 9

    Data from Figure 9a

    10.17182/hepdata.65389.v1/t9

    The inclusive $b$-jet cross-section $\sigma^{*}(Zb)\times N_{b\text{-jet}}$ as a function of $\Delta y(Z,b)$ together with the corresponding non-perturbative corrections.

  • Table 10

    Data from Figure 9a

    10.17182/hepdata.65389.v1/t10

    Breakdown of systematic uncertainties (in %) for the inclusive $b$-jet cross-section $\sigma^{*}(Zb)\times N_{b\text{-jet}}$ as a function of $\Delta y(Z,b)$.

  • Table 11

    Data from Figure 10a

    10.17182/hepdata.65389.v1/t11

    The inclusive $b$-jet cross-section $\sigma^{*}(Zb)\times N_{b\text{-jet}}$ as a function of $\Delta\phi(Z,b)$ together with the corresponding non-perturbative corrections.

  • Table 12

    Data from Figure 10a

    10.17182/hepdata.65389.v1/t12

    Breakdown of systematic uncertainties (in %) for the inclusive $b$-jet cross-section $\sigma^{*}(Zb)\times N_{b\text{-jet}}$ as a function of $\Delta\phi(Z,b)$.

  • Table 13

    Data from Figure 10b

    10.17182/hepdata.65389.v1/t13

    The inclusive $b$-jet cross-section $\sigma^{*}(Zb)\times N_{b\text{-jet}}$ as a function of $\Delta R(Z,b)$ together with the corresponding non-perturbative corrections.

  • Table 14

    Data from Figure 10b

    10.17182/hepdata.65389.v1/t14

    Breakdown of systematic uncertainties (in %) for the inclusive $b$-jet cross-section $\sigma^{*}(Zb)\times N_{b\text{-jet}}$ as a function of $\Delta R(Z,b)$.

  • Table 15

    Data from Figure 8a

    10.17182/hepdata.65389.v1/t15

    The cross-section $\sigma(Zb)$ as a function of $Z$ boson $p_T$ together with the corresponding non-perturbative corrections.

  • Table 16

    Data from Figure 8a

    10.17182/hepdata.65389.v1/t16

    Breakdown of systematic uncertainties (in %) for the cross-section $\sigma(Zb)$ as a function of $Z$ boson $p_T$.

  • Table 17

    Data from Figure 8b

    10.17182/hepdata.65389.v1/t17

    The cross-section $\sigma(Zb)$ as a function of $Z$ boson $|y|$ together with the corresponding non-perturbative corrections.

  • Table 18

    Data from Figure 8b

    10.17182/hepdata.65389.v1/t18

    Breakdown of systematic uncertainties (in %) for the cross-section $\sigma(Zb)$ as a function of $Z$ boson $|y|$.

  • Table 19

    Data from Table 4 and Figure 6b

    10.17182/hepdata.65389.v1/t19

    Integrated $Z+\ge 2$ $b$-jets cross-section.

  • Table 20

    Data from Table 4 and Figure 6b

    10.17182/hepdata.65389.v1/t20

    Breakdown of systematic uncertainties (in %) for the integrated $Z+\ge 2$ $b$-jets cross-section.

  • Table 21

    Data from Figure 12b

    10.17182/hepdata.65389.v1/t21

    The cross-section $\sigma(Zbb)$ as a function of $\Delta R(b,b)$ together with the corresponding non-perturbative corrections.

  • Table 22

    Data from Figure 12b

    10.17182/hepdata.65389.v1/t22

    Breakdown of systematic uncertainties (in %) for the cross-section $\sigma(Zbb)$ as a function of $\Delta R(b,b)$.

  • Table 23

    Data from Figure 12a

    10.17182/hepdata.65389.v1/t23

    The cross-section $\sigma(Zbb)$ as a function of $\Delta m(b,b)$ together with the corresponding non-perturbative corrections.

  • Table 24

    Data from Figure 12a

    10.17182/hepdata.65389.v1/t24

    Breakdown of systematic uncertainties (in %) for the cross-section $\sigma(Zbb)$ as a function of $\Delta m(b,b)$.

  • Table 25

    Data from Figure 11a

    10.17182/hepdata.65389.v1/t25

    The cross-section $\sigma(Zbb)$ as a function of $Z$ boson $p_T$ together with the corresponding non-perturbative corrections.

  • Table 26

    Data from Figure 11a

    10.17182/hepdata.65389.v1/t26

    Breakdown of systematic uncertainties (in %) for the cross-section $\sigma(Zbb)$ as a function of $Z$ boson $p_T$.

  • Table 27

    Data from Figure 11b

    10.17182/hepdata.65389.v1/t27

    The cross-section $\sigma(Zbb)$ as a function of $Z$ boson $|y|$ together with the corresponding non-perturbative corrections.

  • Table 28

    Data from Figure 11b

    10.17182/hepdata.65389.v1/t28

    Breakdown of systematic uncertainties (in %) for the cross-section $\sigma(Zbb)$ as a function of $Z$ boson $|y|$.

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