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Article
Report number arXiv:2112.08090 ; CERN-EP-2021-190
Title 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
Related titleA 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
Author(s) ATLAS Collaboration  Mostra tots els 2914 autors
Corporate Author(s) ATLAS Collaboration
Publication 2022-07-10
Imprint 15 Dec 2021
Number of pages 38
Note 38 pages in total, author list starting page 22, 8 figures, 1 table, 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/
In: Phys. Lett. B 830 (2022) 137106
DOI 10.1016/j.physletb.2022.137106 (publication)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords exotics ; experimental results
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 139fb1 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 geu1R=gμc1R=1, at 95 % confidence level. The limit on the coupling reduces to geu1R=gμc1R=0.46 for a mass of 1420 GeV.
Related document supersedes: ATLAS-CONF-2021-045
Copyright/License publication: © 2022-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³
preprint: © 2021-2024 CERN (License: CC-BY-4.0)



Corresponding record in: Inspire
Email contact: tatjana.lenz@cern.ch


 Registre creat el 2021-12-15, darrera modificació el 2024-08-03


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