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Search for high-mass dilepton resonances using 139 fb$^{-1}$ of $pp$ collision data collected at $\sqrt{s}=$13 TeV with the ATLAS detector

The collaboration
No Journal Information, 2019

Abstract (data abstract)
A search for high-mass dielectron and dimuon resonances in the mass range of 250 GeV to 6 TeV is presented. The data were recorded by the ATLAS experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$=13 TeV during Run 2 of the Large Hadron Collider and correspond to an integrated luminosity of 139 fb$^{-1}$. Limits are set on the fiducial cross-section times branching ratio to dielectrons and dimuons for generic resonances with a relative natural width in the range of zero to 10%. Limits on the Heavy Vector Triplet model couplings and on the masses of vector resonances are inferred.

• #### Dielectron invariant mass spectrum

Data from figure 1a

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Distribution of the dielectron invariant mass for events passing the full selection.

• #### Dimuon invariant mass spectrum

Data from figure 1b

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Distribution of the dimuon invariant mass for events passing the full selection.

• #### Expected dilepton cross-section limits

Data from figure 3

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Expected upper limits at 95% CL on the fiducial cross-section times branching ratio as a function of pole mass for...

• #### Observed dilepton cross-section limits

Data from figure 3

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Observed upper limits at 95% CL on the fiducial cross-section times branching ratio as a function of pole mass for...

• #### Expected dielectron cross-section limits

Data from auxiliary figures 3a and 4a

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Expected upper limits at 95% CL on the fiducial cross-section times branching ratio as a function of pole mass for...

• #### Observed dielectron cross-section limits

Data from auxiliary figures 3a and 4a

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Observed upper limits at 95% CL on the fiducial cross-section times branching ratio as a function of pole mass for...

• #### Expected dimuon cross-section limits

Data from auxiliary figures 3b and 4b

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Expected upper limits at 95% CL on the fiducial cross-section times branching ratio as a function of pole mass for...

• #### Observed dimuon cross-section limits

Data from auxiliary figures 3b and figure 4b

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Observed upper limits at 95% CL on the fiducial cross-section times branching ratio as a function of pole mass for...

• #### Ratio of observed limits to SSM cross section

Data from auxiliary figure 7

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Ratio of the observed limit to the Z'$_\mathrm{SSM}$ cross-section for the combination of the dielectron and dimuon channels. A number...

• #### Observed exclusion contours on HVT $\{g_h,g_f\}$ at 3 TeV

Data from figure 4a

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Observed 95% exclusion contours in the HVT parameter space $\{g_h,g_f\}$ with $g_f\equiv g_l=g_q$ for a resonance mass of 3 TeV...

• #### Observed exclusion contours on HVT $\{g_h,g_f\}$ at 4 TeV

Data from figure 4a

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Observed 95% exclusion contours in the HVT parameter space $\{g_h,g_f\}$ with $g_f\equiv g_l=g_q$ for a resonance mass of 4 TeV...

• #### Observed exclusion contours on HVT $\{g_h,g_f\}$ at 5 TeV

Data from figure 4a

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Observed 95% exclusion contours in the HVT parameter space $\{g_h,g_f\}$ with $g_f\equiv g_l=g_q$ for a resonance mass of 5 TeV...

• #### Observed exclusion contours on HVT $\{g_q,g_l\}$ at 3 TeV

Data from figure 4b

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Observed 95% exclusion contours in the HVT parameter space $\{g_q,g_l\}$ with $g_h$ set to zero for a resonance mass of...

• #### Observed exclusion contours on HVT $\{g_q,g_l\}$ at 4 TeV

Data from figure 4b

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Observed 95% exclusion contours in the HVT parameter space $\{g_q,g_l\}$ with $g_h$ set to zero for a resonance mass of...

• #### Observed exclusion contours on HVT $\{g_q,g_l\}$ at 5 TeV

Data from figure 4b

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Observed 95% exclusion contours in the HVT parameter space $\{g_q,g_l\}$ with $g_h$ set to zero for a resonance mass of...

• #### Expected exclusion contours on HVT $\{g_h,g_f\}$ at 3 TeV

Data from auxiliary figure 14a

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Expected 95% exclusion contours in the HVT parameter space $\{g_h,g_f\}$ with $g_f\equiv g_l=g_q$ for a resonance mass of 3 TeV...

• #### Expected exclusion contours on HVT $\{g_h,g_f\}$ at 4 TeV

Data from auxiliary figure 14a

10.17182/hepdata.88425.v2/t17

Expected 95% exclusion contours in the HVT parameter space $\{g_h,g_f\}$ with $g_f\equiv g_l=g_q$ for a resonance mass of 4 TeV...

• #### Expected exclusion contours on HVT $\{g_h,g_f\}$ at 5 TeV

Data from auxiliary figure 14a

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Expected 95% exclusion contours in the HVT parameter space $\{g_h,g_f\}$ with $g_f\equiv g_l=g_q$ for a resonance mass of 5 TeV...

• #### Expected exclusion contours on HVT $\{g_q,g_l\}$ at 3 TeV

Data from auxiliary figure 14b

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Expected 95% exclusion contours in the HVT parameter space $\{g_q,g_l\}$ with $g_h$ set to zero for a resonance masses of...

• #### Expected exclusion contours on HVT $\{g_q,g_l\}$ at 4 TeV

Data from auxiliary figure 14b

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Expected 95% exclusion contours in the HVT parameter space $\{g_q,g_l\}$ with $g_h$ set to zero for a resonance masses of...

• #### Expected exclusion contours on HVT $\{g_q,g_l\}$ at 5 TeV

Data from auxiliary figure 14b

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Expected 95% exclusion contours in the HVT parameter space $\{g_q,g_l\}$ with $g_h$ set to zero for a resonance masses of...

• #### Selection efficiency for spin-0, spin-1 and spin-2 resonances

Data from auxiliary figure 16

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Dielectron and dimuon selection efficiency as a function of pole mass for spin-0, spin-1 and spin-2 resonances. Drell-Yan MC samples...

• #### Relative dielectron mass resolution parameters

Data from auxiliary figure 10

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Description of the $m_{\ell\ell}^{\mathrm{true}}$-dependence for the seven relative mass resolution parameters in the dielectron channel.

• #### Relative dimuon mass resolution parameters

Data from auxiliary figure 11

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Description of the $m_{\ell\ell}^{\mathrm{true}}$-dependence for the seven relative mass resolution parameters in the dimuon channel.

Version 2 modifications: Corrected typo in units of limit results: pb changed to fb.