A search for an excited muon decaying to a muon and two jets in pp collisions at $$\sqrt{s}\;=\;8\;{\rm{TeV}}$$ with the ATLAS detector
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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- AC02-76SF00515; AC02-05CH11231
- OSTI ID:
- 1281025
- Alternate ID(s):
- OSTI ID: 1379501
- Journal Information:
- New Journal of Physics, Vol. 18, Issue 7; ISSN 1367-2630
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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