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 √s = 13 TeV

ATLAS Publications, T.M. Carter, A. Hasib, M.P. Heath, S. Palazzo, E.P. Takeva, N. Themistokleous, E.M. Villhauer, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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+μ− to 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 g eu 1R = gμc 1R = 1, at 95% confidence level. The limit on the coupling reduces to g eu 1R = gμc 1R = 0.46 for a mass of 1420 GeV.
Original languageEnglish
Article number137106
Pages (from-to)1-22
Number of pages22
JournalPhysics Letters B
Volume830
DOIs
Publication statusPublished - 10 Jul 2022

Keywords / Materials (for Non-textual outputs)

  • EXTENSION
  • VIOLATION
  • DECAY

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