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

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posted on 2023-06-09, 15:50 authored by N L Abrahams, Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, Samuel Jones, G Lerner, F Miano, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, Kate ShawKate Shaw, C Y Shehu, Thomas StevensonThomas Stevenson, K Suruliz, Mark SuttonMark Sutton, Fabio Tresoldi, Fabrizio Trovato, Iacopo Vivarelli, E Winkels, O Winston, The ATLAS Collaboration, others
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 36.1fb -1 , collected during 2015 and 2016 at a centre-of-mass energy vs = 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 (? ~ 0 1) via one of two next-to-lightest neutralino (? ~ 0 2 ) decay mechanisms: ? ~ 0 2 ?Z? ~ 0 1, where the Z boson decays leptonically leading to a peak in the dilepton invariant mass distribution around the Z boson mass; and ? ~ 0 2 ?l + l - ? ~ 0 1 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 TeV and 1.3 TeV at 95% confidence level, respectively.

History

Publication status

  • Published

File Version

  • Published version

Journal

The European Physical Journal C : Particles and Fields

ISSN

1434-6044

Publisher

Springer Verlag

Issue

625

Volume

78

Page range

1-38

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Experimental Particle Physics Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-11-12

First Open Access (FOA) Date

2018-11-12

First Compliant Deposit (FCD) Date

2018-11-09

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