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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 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

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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

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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

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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

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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

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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

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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

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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

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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

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

• #### Table 20

Data from Table 4 and Figure 6b

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

• #### Table 21

Data from Figure 12b

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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

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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

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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 $|y|$.