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Search for direct top squark pair production in final states with two leptons in vs=13 TeV pp collisions with the ATLAS detector

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posted on 2023-06-09, 12:05 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, The ATLAS Collaboration
The results of a search for direct pair production of top squarks in events with two opposite-charge leptons (electrons or muons) are reported, using 36.1 fb-1 of integrated luminosity from proton–proton collisions at vs=13 TeV collected by the ATLAS detector at the Large Hadron Collider. To cover a range of mass differences between the top squark t~ and lighter supersymmetric particles, four possible decay modes of the top squark are targeted with dedicated selections: the decay t~?b?~1± into a b-quark and the lightest chargino with ?~1±?W?~10 , t~?t?~10 into an on-shell top quark and the lightest neutralino, the three-body decay t~?bW?~10 and the four-body decay t~?bl??~10. No significant excess of events is observed above the Standard Model background for any selection, and limits on top squarks are set as a function of the t~ and ?~01 masses. The results exclude at 95% confidence level t~ masses up to about 720 GeV, extending the exclusion region of supersymmetric parameter space covered by previous searches.

Funding

ATLAS; G0275; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I006048/1

History

Publication status

  • Published

File Version

  • Published version

Journal

The European Physical Journal C - Particles and Fields

ISSN

1434-6044

Publisher

Springer Verlag

Issue

898

Volume

77

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-02-13

First Open Access (FOA) Date

2018-02-13

First Compliant Deposit (FCD) Date

2018-02-13

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