Search for new phenomena using the invariant mass distribution of same-flavour opposite-sign dilepton pairs in events with missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). Search for new phenomena using the invariant mass distribution of same-flavour opposite-sign dilepton pairs in events with missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector. European physical journal. C - particles and fields, 78(8) EDP Sciences 10.1140/epjc/s10052-018-6081-9

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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 luminosityof 36.1 fb⁻¹ collected during 2015 and 2016 at a centre-of-mass energy √s=13 TeV with the ATLAS detectorat 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 (χ̃⁰₁) via one of two next-to-lightest neutralino (χ̃⁰₂) decay mechanisms: χ̃⁰₂ → Zχ̃⁰₁, where the Z boson decays leptonically leadingto a peak in the dilepton invariant mass distribution around the Z boson mass; and χ̃⁰₂ → ℓ⁺ℓ⁻ χ̃⁰₁ with no intermediate ℓ⁺ℓ⁻ 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 and 1.3 TeV at 95% confidence level, respectively.

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