A search for an unexpected asymmetry in the production of e+μ and eμ+ pairs in proton–proton collisions recorded by the ATLAS detector at s=13 TeV

The ATLAS collaboration

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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 eμ+ pairs to constrain physics processes beyond the Standard Model. It uses 139fb−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 eμ+, 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 λ231 is close to unity. Observations using the other selection exclude scalar leptoquarks with masses below 1880 GeV when g1R eu=g1R μc=1, at 95% confidence level. The limit on the coupling reduces to g1R eu=g1R μc=0.46 for a mass of 1420 GeV.

Original languageEnglish (US)
Article number137106
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume830
DOIs
StatePublished - Jul 10 2022
Externally publishedYes

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