Abstract
Abstract:
A search for new phenomena in final states containing an e+ e− or µ+ µ− pair, jets, and large
missing
transverse momentum is presented. This analysis makes use of proton–proton collision data with an
integrated luminosity of 36.1 fb−1, collected during 2015 and 2016 at a centre-of-mass energy √s =
13 TeV with the ATLAS detector at the Large Hadron Collider. The search targets the pair production
of supersymmetric coloured particles (squarks or gluinos) and their decays into final states
containing an e+ e− or µ+ µ− pair and the lightest neutralino ( χ˜0) via one of two
next-to-lightest neutralino ( χ˜0)
1
2
decay mechanisms: χ˜0 → Z χ˜0, where the Z boson decays leptonically leading to a peak in the
dilepton
2 1
invariant mass distribution around the Z boson mass; and χ˜0 → f+f− χ˜0 with no intermediate f+f−
2 1
resonance, yielding a kinematic endpoint in the dilepton invariant mass spectrum. The data are
found to be consistent with the Standard Model expectation. Results are interpreted using
simplified models, and exclude gluinos and squarks with masses as large as 1.85 TeV and 1.3 TeV at
95% confidence
level, respectively.