A search for an unexpected asymmetry in the production of $e^+ μ^-$ and $e^- μ^+$ pairs in proton-proton collisions recorded by the ATLAS detector at $\sqrt s = 13$ TeV

ATLAS Collaboration, Paul Newman

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Abstract

This search, a type not previously performed at ATLAS, uses a comparison of the production cross sections for e+μ- and e-μ+ pairs to constrain physics processes beyond the Standard Model. It uses 139 fb-1  of proton–proton collision data recorded at √s = 13 TeV at the LHC. Targeting sources of new physics which prefer final states containing e+μto e-μ+, the search contains two broad signal regions which are used to provide model-independent constraints on the ratio of cross sections at the 2% level. The search also has two special selections targeting supersymmetric models and leptoquark signatures. Observations using one of these selections are able to exclude, at 95% confidence level, singly produced smuons with masses up to 640 GeV in a model in which the only other light sparticle is a neutralino when the R-parity-violating coupling λ'231 is close to unity. Observations using the other selection exclude scalar leptoquarks with masses below 1880 GeV when geu1R = gμc1R = 1, at 95% confidence level. The limit on the coupling reduces to geu1R = gμc1R = 0.46  for a mass of 1420 GeV.
Original languageEnglish
Article number137106
Number of pages22
JournalPhysics Letters B
Volume830
Early online date15 Apr 2022
DOIs
Publication statusPublished - 10 Jul 2022

Bibliographical note

46 pages in total, author list starting page 30, 14 figures, 6 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-29/

Keywords

  • hep-ex

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