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



Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H
et al (show 2813 more authors) (2016) A search for an excited muon decaying to a muon and two jets in pp collisions at √s=8 TeV with the ATLAS detector NEW JOURNAL OF PHYSICS, 18 (7). 073021-. ISSN 1367-2630, 1367-2630

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Abstract

Anew search signature for excited leptons is explored. Excited muons are sought in the channel pp → μμ∗→ μμ jet jet, 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 = 8 TeV 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-muonmass μμ∗. For μμ∗between 1.3 and 3.0 TeV, the upper limit on φB (μ∗→ μqq) is between 0.6 and 1 fb. Limits on sB are converted to lower bounds on the compositeness scale. In the limiting case L = μμ∗, excitedmuonswith amass below2.8 TeVare excluded.With the samemodel assumptions, these limits at larger μ∗masses improve upon previous limits fromtraditional searches based on the gauge-mediated decay μ∗→ μγ.

Item Type: Article
Additional Information: 33 pages in total, author list starting page 16, 4 figures, 5 tables, final version published by New Journal of Physics including corrections in Erratum https://dx.doi.org/10.1088/1367-2630/ab46ed. All figures including auxiliary are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2015-01
Uncontrolled Keywords: excited leptons, lepton compositeness, leptoquarks
Depositing User: Symplectic Admin
Date Deposited: 21 Feb 2017 14:52
Last Modified: 24 Jun 2026 16:21
DOI: 10.1088/1367-2630/18/7/073021
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3005936
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