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Search for new resonances in mass distributions of jet pairs using 139 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

The collaboration
No Journal Information, 2019

Abstract (data abstract)
A search for new resonances decaying into a pair of jets is reported using the dataset of proton-proton collisions 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$^{-1}$. The distribution of the invariant mass of the two leading jets is examined for local excesses above a data-derived estimate of the Standard Model background. In addition to an inclusive dijet search, events with jets identified as containing b-hadrons are examined specifically. No significant excess of events above the smoothly falling background spectra is observed. The results are used to set cross-section upper limits at 95% confidence level on a range of new physics scenarios. Model-independent limits on Gaussian-shaped signals are also reported. The analysis looking at jets containing b-hadrons benefits from improvements in the jet flavour identification at high transverse momentum, which increases its sensitivity relative to the previous analysis beyond that expected from the higher integrated luminosity.

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Data from Figure 2

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The probability of an event to pass the b-tagging requirement after the rest of the event selection, shown as a...

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Data from Figure 3a

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Dijet invariant mass distribution for the inclusive category with |y*| < 0.6.

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Data from Figure 3b

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Dijet invariant mass distribution for the inclusive category with |y*| < 1.2.

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Data from Figure 3c

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Dijet invariant mass distribution for the category with at least one b-tagged jet.

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Data from Figure 3d

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Dijet invariant mass distribution for the category with both jets b-tagged.

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Data from Figure 4a

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The 95% CL upper limits on the cross-section times acceptance times branching ratio into two jets as a function of...

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Data from Figure 4b

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The 95% CL upper limits on the cross-section times acceptance times branching ratio into two jets as a function of...

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Data from Figure 4c

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The 95% CL upper limits on the cross-section times acceptance times branching ratio into two jets as a function of...

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Data from Figure 4d

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The 95% CL upper limits on the cross-section times acceptance times branching ratio into two jets as a function of...

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Data from Figure 5

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The upper limits on the DM mediator Z' signal at 95% CL from the inclusive category. The 95% CL upper...

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Data from Figure 6

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The 95% CL upper limit on the cross-section times acceptance times b-tagging efficiency times branching ratio as a function of...

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Data from Figure 7a

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The 95% CL upper limit on the cross-section times acceptance times b-tagging efficiency times branching ratio as a function of...

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Data from Figure 7b

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The 95% CL upper limit on the cross-section times acceptance times b-tagging efficiency times branching ratio as a function of...

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Data from Figure 7c

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The 95% CL upper limit on the cross-section times acceptance times b-tagging efficiency times branching ratio as a function of...

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Data from Figure 8a

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The 95% CL upper limit on the cross-section times kinematic acceptance times branching ratio for resonances with a generic Gaussian...

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Data from Figure 8b

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The 95% CL upper limit on the cross-section times kinematic acceptance times b-tagging efficiency times branching ratio for resonances with...

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Data from Figure 8c

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The 95% CL upper limit on the cross-section times kinematic acceptance times b-tagging efficiency times branching ratio for resonances with...

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Data from Figure 9

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The expected 95% CL upper limits on the cross-section times acceptance times b-tagging efficiency times branching ratio as a function...

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Figure 7 from auxiliary material

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Acceptance for the QBH, Q* and W' benchmark signal models in the inclusive category, as a function of the simulated...

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Figure 8 from auxiliary material

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Acceptance for the DM Z' benchmark signal model for various $g_q$ coupling parameters in the inclusive category, as a function...

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Figure 9 from auxiliary material

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Acceptance for the W* benchmark signal model in the inclusive category, as a function of the simulated mass.

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Figure 10 from auxiliary material

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Acceptance times b-tagging efficiency for the b* benchmark signal model in the 1b category, as a function of the simulated...

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Figure 11 from auxiliary material

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Acceptance times b-tagging efficiency for the DM Z' with $g_q$=0.25, SSM Z' and graviton with $k/\overline{M}_{PL}=0.2$ benchmark signal models in...

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Figure 12 from auxiliary material

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The expected 95% CL upper limits on the cross-section times branching ratio as a function of the DM mediator Z'...