Search for heavy particles in the $b$-tagged dijet mass distribution with additional $b$-tagged jets in proton-proton collisions at $\sqrt s$= 13  TeV with the ATLAS experiment

The ATLAS collaboration
Phys.Rev.D 105 (2022) 012001, 2022.

Abstract (data abstract)
A search optimized for new heavy particles decaying to two $b$-quarks and produced in association with additional $b$-quarks is reported. The sensitivity is improved by $b$-tagging at least one lower-$p_\text{T}$ jet in addition to the two highest-$p_\text{T}$ jets. The data used in this search correspond to an integrated luminosity of 103 $\text{fb}^{-1}$ collected with a dedicated trijet trigger during the 2017 and 2018 $\sqrt{s} = 13$ TeV proton--proton collision runs with the ATLAS detector at the LHC. The search looks for resonant peaks in the $b$-tagged dijet invariant mass spectrum over a smoothly falling background. The background is estimated with an innovative data-driven method based on orthonormal functions. The observed $b$-tagged dijet invariant mass spectrum is compatible with the background-only hypothesis. Upper limits at 95% confidence level on a heavy vector-boson production cross section times branching ratio to a pair of $b$-quarks are derived.

  • Table 1

    Data from Figure 3


    Background estimate from the FD method with N=3 and data in the SR.

  • Table 2

    Data from Figure 4


    The observed (solid) and expected (dashed) 95% CL upper limits on the production of $Z' \to b\bar{b}$ in association with...

  • Table 3

    Figure 02 from auxiliary material


    Acceptance and Acceptance times efficiency for the LUV Z' model.

  • Table 4

    Figure 03 from auxiliary material


    Fitted event-level b-tagging selection efficiency as a function of the dijet invariant mass. The uncertainties are evaluated by propagating the...

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