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

Aad, G.Abbott, B.Abbott, D.C.Abed Abud, A.Abeling, K.Abhayasinghe, D.K.Abidi, S.H.Aboulhorma, A.Abramowicz, H.Abreu, H.Abulaiti, Y.Abusleme Hoffman, A.C.Acharya, B.S.Achkar, B.Adam, L.Adam Bourdarios, C.Adamczyk, L.Adamek, L.Addepalli, S.V.Adelman, J.Adiguzel, A.Adorni, S.Adye, T.Affolder, A.A.Afik, Y.Agapopoulou, C.Agaras, M.N.Agarwala, J.Aggarwal, A.Agheorghiesei, C.Aguilar Saavedra, J.A.Ahmad, A.Ahmadov, F.Ahmed, W.S.Ai, X.Aielli, G.Aizenberg, I.Akatsuka, S.Akbiyik, M.Åkesson, T.P.A.Akimov, A.V.Al Khoury, K.Alberghi, G.L.Albert, J.Albicocco, P.Alconada Verzini, M.J.Alderweireldt, S.Aleksa, M.Aleksandrov, I.N.Alexa, C.Alexopoulos, T.Alfonsi, A.Alfonsi, F.Alhroob, M.Ali, B.Ali, S.Aliev, M.Alimonti, G.Allaire, C.Allbrooke, B.M.M.2023-11-072023-11-072022-07-10Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Volume 830, 10 July 2022, Article number 1371060370-2693https://repositorio.unab.cl/xmlui/handle/ria/53868Indexación: Scopus.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=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 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. © 2022 The Author(s)enBosonPartonsHiggs BosonsA 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 TeVArtículoCC BY 4.0 DEED Attribution 4.0 International10.1016/j.physletb.2022.137106