Search for electroweak-scale dijet resonances using trigger-level analysis with the ATLAS detector in $132$ fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 13$ TeV

The ATLAS collaboration
CERN-EP-2025-194, 2025.

Abstract (data abstract)
This article reports on a search for dijet resonances using $132$ fb$^{-1}$ of $pp$ collision data recorded at $\sqrt{s} = 13$ TeV by the ATLAS detector at the Large Hadron Collider. The search is performed solely on jets reconstructed within the ATLAS trigger to overcome bandwidth limitations imposed on conventional single-jet triggers, which would otherwise reject data from decays of TeV dijet resonances. Collision events with two jets satisfying transverse momentum thresholds of $p_{\textrm{T}} \ge 85$ GeV and jet rapidity separation of $|y^{*}|<0.6$ are analysed for dijet resonances with invariant masses from $375$ to $1800$ GeV. A data-driven background estimate is used to model the dijet mass distribution from multijet processes. No significant excess above the expected background is observed. Upper limits are set at $95\%$ confidence level on coupling values for a benchmark leptophobic axial-vector $Z^{\prime}$ model and on the production cross-section for a new resonance contributing a Gaussian-distributed line-shape to the dijet mass distribution.

  • Dijet mass distribution (J50)

    Data and background fit from Figure 7 (J50).

    10.17182/hepdata.161624.v1/t1

    Observed $m_{jj}$ distribution for the J50 signal region, using variable-width bins and the analysis selections. The background estimate corresponds to...

  • Dijet mass distribution (J100)

    Data and background fit from Figure 7 (J100).

    10.17182/hepdata.161624.v1/t2

    Observed $m_{jj}$ distribution for the J100 signal region, using variable-width bins and the analysis selections. The background estimate corresponds to...

  • Gaussian resonance limits (J50)

    Limits from Figure 9a (J50).

    10.17182/hepdata.161624.v1/t3

    Observed 95% $\text{CL}_\text{S}$ upper limits on the production cross-section times acceptance times branching ratio to jets, $\sigma \cdot A \cdot...

  • Gaussian resonance limits (J100)

    Limits from Figure 9a (J100).

    10.17182/hepdata.161624.v1/t4

    Observed 95% $\text{CL}_\text{S}$ upper limits on the production cross-section times acceptance times branching ratio to jets, $\sigma \cdot A \cdot...

  • Z' limits (J50)

    Limits from Figure 9b (J50).

    10.17182/hepdata.161624.v1/t5

    Observed 95% $\text{CL}_\text{S}$ upper limits on the the value of the coupling to quarks, $g_q$, of the $Z^\prime$ model as...

  • Z' limits (J100)

    Limits from Figure 9b (J100).

    10.17182/hepdata.161624.v1/t6

    Observed 95% $\text{CL}_\text{S}$ upper limits on the the value of the coupling to quarks, $g_q$, of the $Z^\prime$ model as...

  • Acceptance

    Acceptance from Figure 2 of auxiliary material.

    10.17182/hepdata.161624.v1/t7

    Acceptance of simulated $Z^\prime$ signal events given the analysis event selection as a function of $m_{Z^\prime}$. The solid black line...

  • Cutflow

    Data not in paper.

    10.17182/hepdata.161624.v1/t8

    Numbers of events in each of the two considered datasets after consecutively applying the analysis selections.

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