Search for resonances in the mass distribution of jet pairs with one or two jets identified as $b$-jets in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

The ATLAS collaboration
No Journal Information, 2018

Abstract (data abstract)
A search for new resonances decaying into jets containing b-hadrons in pp collisions with the ATLAS detector at the LHC is presented in the dijet mass range from 0.57 TeV to 7 TeV. The dataset corresponds to an integrated luminosity of up to 36.1 $fb^{−1}$ collected in 2015 and 2016 at √s=13 TeV. No evidence of a significant excess of events above the smooth background shape is found. Upper cross-section limits and lower limits on the corresponding signal mass parameters for several types of signal hypotheses are provided at 95% CL. In addition, 95% CL upper limits are set on the cross-sections for new processes that would produce Gaussian-shaped signals in the di-b-jet mass distributions.

  • Table 1

    Figure 2(a) from Page 7

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    The per-event b-tagging efficiencies after the event selection, as a function of the reconstructed invariant mass, for both single b-tagged...

  • Table 2

    Figure 2(b) from Page 7

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    The per-event b-tagging efficiencies after the event selection, as a function of the reconstructed invariant mass, for double b-tagged category....

  • Table 3

    Figure 3(a) from Page 10

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    Dijet mass spectra after the background only fit with the background prediction in the inclusive 1-b-tag high-mass region.

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    Figure 3(b) from Page 10

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    Dijet mass spectra after the background only fit with the background prediction in the high-mass region with two b-tags.

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    Figure 3(c) from Page 10

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    Dijet mass spectra after the background only fit with the background prediction in the low-mass region with two b-tags.

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    Figure 4 from Page 12

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    The online b-tagging efficiency with respect to the offline b-tagging efficiency as a function of pT. The b-tagging online and...

  • Table 7

    Figure 5 from Page 13

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    Observed and expected 95% credibility-level upper limits on the cross-section for the b* model in the high-mass region with inclusive...

  • Table 8

    Figure 6 from Page 13

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    Observed and expected 95% credibility-level upper limits on the cross-section times branching ratio for the SSM and leptophobic Z' models...

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    Figure 7(a) from Page 14

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    Observed and expected 95% credibility-level upper limits on the cross-section for DM Z' models in the low-mass region with two...

  • Table 10

    Figure 7(b) from Page 14

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    Observed and expected 95% credibility-level upper limits on the cross-section times branching ratio for DM Z'->bb models in the high-mass...

  • Table 11

    Figure 8 from Page 15

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    Observed and expected 95% credibility-level upper limits on cross section times acceptance times branching ratio of X --> bb, including...

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    Figure 9 from Page 15

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    Observed and expected 95% credibility-level upper limits on cross section times acceptance times branching ratio of X --> bb, including...

  • Table 13

    Figure 1 from auxiliary material

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    The mass distributions for the inclusive one b-tagged selection and two b-tagged selection using an integrated luminosity of 36.1 $fb^{-1}$....

  • Table 14

    Figure 2(a) from auxiliary material

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    Signal acceptance times efficiency for inclusive 1 b-tag and 2 b-tag categories as a function of the simulated b* and...

  • Table 15

    Figure 2(b) from auxiliary material

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    Signal acceptance times efficiency for 2 b-tag categories as a function of the simulated Z' masses.

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    Figure 3(a) from auxiliary material

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    The flavor composition of the simulated dijet background as a function of dijet mass before tagging. The fraction of the...

  • Table 17

    Figure 3(b) from auxiliary material

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    The flavor composition of the simulated dijet background as a function of dijet mass with inclusive one b-tag. The fraction...

  • Table 18

    Figure 3(c) from auxiliary material

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    The flavor composition of the simulated dijet background as a function of dijet mass with two b-tags. The fraction of...

  • Table 19

    Figure 4 from auxiliary material

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    Observed and expected 95% credibility-level upper limits on cross section times acceptance times branching ratio of X --> bb, including...

  • Table 20

    Figure 4 from auxiliary material

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    Observed and expected 95% credibility-level upper limits on cross section times acceptance times branching ratio of X --> bb, including...

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    Figure 4 from auxiliary material

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    Observed and expected 95% credibility-level upper limits on cross section times acceptance times branching ratio of X --> bb, including...

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    Figure 4 from auxiliary material

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    Observed and expected 95% credibility-level upper limits on cross section times acceptance times branching ratio of X --> bb, including...

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    Figure 5 from auxiliary material

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    Observed and expected 95% credibility-level upper limits on cross section times acceptance times branching ratio of X --> bb, including...

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    Figure 5 from auxiliary material

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    Observed and expected 95% credibility-level upper limits on cross section times acceptance times branching ratio of X --> bb, including...

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    Figure 5 from auxiliary material

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    Observed and expected 95% credibility-level upper limits on cross section times acceptance times branching ratio of X --> bb, including...

  • Table 26

    Figure 5 from auxiliary material

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    Observed and expected 95% credibility-level upper limits on cross section times acceptance times branching ratio of X --> bb, including...

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