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

Barton, Adam Edward and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Cheatham, Sue and Dearnaley, William and Fox, Harald and Grimm, Kathryn Ann Tschann and Henderson, Robert Charles William and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Muenstermann, Daniel Matthias Alfred and Skinner, Malcolm and Smizanska, Maria and Walder, James William and Wharton, Andy (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). ISSN 1367-2630

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Abstract

A new 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-muon mass 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∗, 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.

Item Type: Journal Article
Journal or Publication Title: New Journal of Physics
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 80737
Deposited By: ep_importer_pure
Deposited On: 05 Aug 2016 10:22
Refereed?: Yes
Published?: Published
Last Modified: 15 Oct 2019 03:48
URI: https://eprints.lancs.ac.uk/id/eprint/80737

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