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A search for an unexpected asymmetry in the production of e(+)mu(-) and e(-)mu(+) pairs in proton-proton collisions recorded by the ATLAS detector at root s=13 TeV
Aix Marseille Univ, CPPM, CNRS IN2P3, Marseille, France..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0001-9415-7903
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0009-0004-1439-5151
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
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Number of Authors: 29012022 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 830, article id 137106Article in journal (Refereed) Published
Abstract [en]

This search, a type not previously performed at ATLAS, uses a comparison of the production cross sections for e(+)mu(-) and e(-)mu(+) pairs to constrain physics processes beyond the Standard Model. It uses 139 fb(-1) of proton-proton collision data recorded at root s = 13 TeV at the LHC. Targeting sources of new physics which prefer final states containing e(+)mu(-) and e(-)mu(+), 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 lambda(23)(1)' is close to unity. Observations using the other selection exclude scalar leptoquarks with masses below 1880 GeV when g(1R)(eu) = g(1R)(mu c) = 1, at 95% confidence level. The limit on the coupling reduces to g(1R)(eu) = g(1R)(mu c) = 0.46 for a mass of 1420 GeV.

Place, publisher, year, edition, pages
Elsevier BV , 2022. Vol. 830, article id 137106
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Subatomic Physics Economics
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URN: urn:nbn:se:kth:diva-316800DOI: 10.1016/j.physletb.2022.137106ISI: 000833528800001Scopus ID: 2-s2.0-85151987732OAI: oai:DiVA.org:kth-316800DiVA, id: diva2:1691320
Note

QC 20220830

Available from: 2022-08-30 Created: 2022-08-30 Last updated: 2023-08-29Bibliographically approved

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Leopold, AlexanderLundberg, OlofLund-Jensen, BengtOhm, ChristianRipellino, GiuliaShaheen, RabiaShope, David R.Strandberg, Jonas
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