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

0562037 - FZÚ 2023 RIV NL eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal … Total 2902 authors
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.
Physics Letters. B. Roč. 830, July (2022), č. článku 137106. ISSN 0370-2693. E-ISSN 1873-2445
Research Infrastructure: CERN-CZ II - 90104; e-INFRA CZ - 90140
Institutional support: RVO:68378271
Keywords : p p: colliding beams * leptoquark: scalar * ATLAS
OECD category: Particles and field physics
Impact factor: 4.3, year: 2022
Method of publishing: Open access

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 139fb−1 of proton–proton collision data recorded at s=13TeV 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 640GeV in a model in which the only other light sparticle is a neutralino when the R-parity-violating coupling λ231′ is close to unity.
Permanent Link: https://hdl.handle.net/11104/0336483