Search for new high-mass phenomena in the dilepton final state using 36 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}$ = 13 TeV with the ATLAS detector

TL;DR

This paper reports a search for new high-mass particles in dilepton final states using 36.1 fb$^{-1}$ of 13 TeV proton-proton collision data from the ATLAS detector, finding no deviations from the Standard Model and setting new limits on potential new physics.

Contribution

First search using this dataset to set limits on high-mass phenomena in dilepton channels with no observed deviations from the Standard Model.

Findings

No significant deviations observed.

Lower mass limits up to 4.1 TeV for Z'$_{ ext{chi}}$.

Contact interaction scale limits between 24 and 40 TeV.

Abstract

A search is conducted for new resonant and non-resonant high-mass phenomena in dielectron and dimuon final states. The search uses 36.1 fb$^{-1}$ of proton-proton collision data, collected at $\sqrt{s}$ = 13 TeV by the ATLAS experiment at the LHC in 2015 and 2016. No significant deviation from the Standard Model prediction is observed. Upper limits at 95% credibility level are set on the cross-section times branching ratio for resonances decaying into dileptons, which are converted to lower limits on the resonance mass, up to 4.1 for the E$_{6}$-motivated Z'$_{\chi}$. Lower limits on the $qq \ell\ell$ contact interaction scale are set between 24 TeV and 40 TeV, depending on the model.