Search for non-resonant production of semi-visible jets using Run~2 data in ATLAS

The ATLAS collaboration
Phys.Lett.B 848 (2024) 138324, 2024.

Abstract
Semi-visible jets, with a significant contribution to the event's missing transverse momentum, can arise in strongly interacting dark sectors. This results in an event topology where one of the jets can be aligned with the direction of the missing transverse momentum. The first search for semi-visible jets produced via a $t$-channel mediator exchange is presented. The analysis uses proton-proton collisions with an integrated luminosity of 139 fb$^{-1}$ and a centre-of-mass energy of 13 TeV, collected with the ATLAS detector during the Run 2 of the LHC. No excess over Standard Model predictions is observed. Assuming a coupling strength of unity between the mediator, a Standard Model quark and a dark quark, mediator masses up to 2.7 TeV are excluded at the 95% confidence level. Upper limits on the coupling strength are also derived.

  • Signal region 9-bin grid yields

    Fig. 3 (a) in paper

    10.17182/hepdata.144506.v1/t1

    The post-fit yields in the nine bins of the $(p_\textrm{T}^{\textrm{bal}}, |\phi_{\textrm{max}} - \phi_{\textrm{min}}|)$ grid. Error band includes all the systematic...

  • $H_{\text{T}}$ distribution

    Fig. 4 (a) in paper

    10.17182/hepdata.144506.v1/t2

    The post-fit distributions of HT for the SR. Data are compared with background predictions, and six signal predictions covering a...

  • $E_{\text{T}}^{\text{miss}}$ distribution

    Fig. 4 (b) in paper

    10.17182/hepdata.144506.v1/t3

    The post-fit distributions of $E_{\text{T}}^{\text{miss}}$ for the SR. Data are compared with background predictions, and six signal predictions covering a...

  • $p_\textrm{T}^{\textrm{bal}}$ distribution

    Fig. 4 (c) in paper

    10.17182/hepdata.144506.v1/t4

    The post-fit distributions of $p_\textrm{T}^{\textrm{bal}}$ for the SR. Data are compared with background predictions, and six signal predictions covering a...

  • |$\phi_{\textrm{max}} - \phi_{\textrm{min}}$| distribution

    Fig. 4 (d) in paper

    10.17182/hepdata.144506.v1/t5

    The post-fit distributions of |$\phi_{\textrm{max}} - \phi_{\textrm{min}}$| for the SR. Data are compared with background predictions, and six signal predictions...

  • SVJ R$_{inv}$ = 0.1 limits

    Figure 3(a) from auxiliary material

    10.17182/hepdata.144506.v1/t6

    Observed 95% CL limits on the t-channel production cross-section for semi-visible jets for R$_{inv}$ = 0.1.

  • SVJ R$_{inv}$ = 0.2 limits

    Figure 3(b) from auxiliary material.

    10.17182/hepdata.144506.v1/t7

    Observed 95% CL limits on the t-channel production cross-section for semi-visible jets for R$_{inv}$ = 0.2.

  • SVJ R$_{inv}$ = 0.4 limits

    Figure 3(c) from auxiliary material.

    10.17182/hepdata.144506.v1/t8

    Observed 95% CL limits on the t-channel production cross-section for semi-visible jets for R$_{inv}$ = 0.4.

  • SVJ R$_{inv}$ = 0.6 limits

    Figure 3(d) from auxiliary material.

    10.17182/hepdata.144506.v1/t9

    Observed 95% CL limits on the t-channel production cross-section for semi-visible jets for R$_{inv}$ = 0.6.

  • SVJ R$_{inv}$ = 0.8 limits

    Figure 3(e) from auxiliary material.

    10.17182/hepdata.144506.v1/t10

    Observed 95% CL limits on the t-channel production cross-section for semi-visible jets for R$_{inv}$ = 0.8.

  • SVJ R$_{inv}$ = 0.9 limits

    Figure 3(f) from auxiliary material.

    10.17182/hepdata.144506.v1/t11

    Observed 95% CL limits on the t-channel production cross-section for semi-visible jets for R$_{inv}$ = 0.9.

  • Signal cross-section

    Figure 3 from auxiliary material.

    10.17182/hepdata.144506.v1/t12

    The LO theory prediction (for λ=1).

  • Cutflow table for 6 signal points

    10.17182/hepdata.144506.v1/t13

    Cutflow table for 6 signals of different mediator masses and R$_{inv}$ fractions.

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