Search for Resonant Production of Dark Quarks in the Dijet Final State with the ATLAS Detector

The ATLAS collaboration
JHEP 02 (2024) 128, 2024.

Abstract (data abstract)
This paper presents a search for a new $Z^\prime$ resonance decaying into a pair of dark quarks which hadronise into dark hadrons before promptly decaying back to Standard Model particles. This analysis is based on proton-proton collision data recorded at $\sqrt{s}=13$ TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb$^{-1}$. After selecting events containing large-radius jets with high track multiplicity, the invariant mass distribution of the two leading jets is scanned to look for an excess above a data-driven estimate of the Standard Model multi-jet background. No significant excess of events is observed and the results are thus used to set $95 \%$ confidence-level upper limits on the production cross-section times branching ratio of the $Z^\prime$ to dark quarks as a function of the $Z^\prime$ mass for various dark-quark scenarios.

  • Di-jet invariant mass after preselections

    Data from Figure 2.

    10.17182/hepdata.145191.v1/t1

    Distribution of the di-jet invariant mass, $m_{\mathrm{JJ}}$ for the data, the simulated multi-jet background and of some representative signals (models...

  • Leading jet number of tracks after preselections

    Data from Figure 3a.

    10.17182/hepdata.145191.v1/t2

    Distributions of the number of tracks associated to the leading jet, $n_{track,1}$, for the data, the simulated multi-jet background and...

  • Sub-leading jet number of tracks after preselections

    Data from Figure 3b.

    10.17182/hepdata.145191.v1/t3

    Distributions of the number of tracks associated to the subleading jet, $n_{track,2}$, for the data, the simulated multi-jet background and...

  • Di-jet invariant mass in SR vs. background-only expectation

    Data from Figure 6.

    10.17182/hepdata.145191.v1/t4

    Distribution of $m_{\mathrm{JJ}}$ in the SR (black points) compared to the background-only expectation, where the shape is derived from the...

  • Observed and expected limits (model A)

    Data from Figure 7a.

    10.17182/hepdata.145191.v1/t5

    Observed and expected limits at 95% CL on the cross-section times branching ratio for the production of dark quarks through...

  • Theory cross-section times branching ratio (model A)

    Data from Figure 7a.

    10.17182/hepdata.145191.v1/t6

    The predicted theory cross-section times branching ratio for the production of dark quarks through a $Z^\prime$ as a function of...

  • Observed and expected limits (model B)

    Data from Figure 7b.

    10.17182/hepdata.145191.v1/t7

    Observed and expected limits at 95% CL on the cross-section times branching ratio for the production of dark quarks through...

  • Theory cross-section times branching ratio (model B)

    Data from Figure 7b.

    10.17182/hepdata.145191.v1/t8

    The predicted theory cross-section times branching ratio for the production of dark quarks through a $Z^\prime$ as a function of...

  • Observed and expected limits (model C)

    Data from Figure 7c.

    10.17182/hepdata.145191.v1/t9

    Observed and expected limits at 95% CL on the cross-section times branching ratio for the production of dark quarks through...

  • Theory cross-section times branching ratio (model C)

    Data from Figure 7c.

    10.17182/hepdata.145191.v1/t10

    The predicted theory cross-section times branching ratio for the production of dark quarks through a $Z^\prime$ as a function of...

  • Observed and expected limits (model D)

    Data from Figure 7d.

    10.17182/hepdata.145191.v1/t11

    Observed and expected limits at 95% CL on the cross-section times branching ratio for the production of dark quarks through...

  • Theory cross-section times branching ratio (model D)

    Data from Figure 7d.

    10.17182/hepdata.145191.v1/t12

    The predicted theory cross-section times branching ratio for the production of dark quarks through a $Z^\prime$ as a function of...

  • Cutflow table for signal points

    Data from Auxiliary Table 1.

    10.17182/hepdata.145191.v1/t13

    Relative efficiency (in %) of each stage of the analysis selection with respect to the previous one for models A...

Loading Data...

Ask a Question


Your question will be emailed to those involved with the submission. Please mention the relevant table.


Please log in to HEPData to send a question.