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A search for an excited muon decaying to a muon and two jets in ppcollisions at √s = 8 TeV with the ATLAS detector

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    0465933 - FZÚ 2017 RIV GB eng J - Journal Article
    Aad, G. - Abbott, B. - Abdallah, J. - Chudoba, Jiří - Havránek, Miroslav - Hejbal, Jiří - Jakoubek, Tomáš - Kepka, Oldřich - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek - Vrba, Václav … Total 2823 authors
    A search for an excited muon decaying to a muon and two jets in ppcollisions at √s = 8 TeV with the ATLAS detector.
    New Journal of Physics. Roč. 18, Jul (2016), 1-21, č. článku 073021. ISSN 1367-2630. E-ISSN 1367-2630
    Institutional support: RVO:68378271
    Keywords : ATLAS * contact interaction * mass dependence * channel cross section * branching ratio * upper limit * CERN LHC Coll
    Subject RIV: BF - Elementary Particles and High Energy Physics
    Impact factor: 3.786, year: 2016

    A new search signature for excited leptons is explored. Excited muons are sought in the channel pp→μμ∗→μμ jetjet, assuming both the production and decay occur via a contact interaction. The analysis is based on 20.3 fb(−)(1) of pp collision data at a centre-of-mass energy of s√=8TeV taken with the ATLAS detector at the large hadron collider. No evidence of excited muons is found, and limits are set at the 95% confidence level on the cross section times branching ratio as a function of the excited-muon mass mμ∗. For mμ∗ between 1.3 and 3.0 TeV, the upper limit on σB(μ∗→μqq¯) is between 0.6 and 1 fb. Limits on σB are converted to lower bounds on the compositeness scale Λ. In the limiting case Λ=mμ∗, excited muons with a mass below 2.8 TeV are excluded. With the same model assumptions, these limits at larger μ∗ masses improve upon previous limits from traditional searches based on the gauge-mediated decay μ∗→μγ.

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