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A search for an excited muon decaying to a muon and two jets in pp collisions at root s=8 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2823
2016 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 18, 073021Article in journal (Refereed) Published
Abstract [en]

Anew search signature for excited leptons is explored. Excited muons are sought in the channel pp -> mu mu* -> mu mu 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 root 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 m(mu)*. For m(mu)* between 1.3 and 3.0 TeV, the upper limit on sigma B(mu* -> mu q (q) over bar) is between 0.6 and 1 fb. Limits on sB are converted to lower bounds on the compositeness scale Lambda. In the limiting case Lambda = m(mu)*, excited muons with a mass below 2.8 TeV are excluded. With the same model assumptions, these limits at larger mu* masses improve upon previous limits from traditional searches based on the gauge-mediated decay mu* -> mu gamma.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. Vol. 18, 073021
Keyword [en]
excited leptons, lepton compositeness, leptoquarks
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-194085DOI: 10.1088/1367-2630/18/7/073021ISI: 000381870700003Scopus ID: 2-s2.0-84979678889OAI: oai:DiVA.org:kth-194085DiVA: diva2:1037390
Funder
Swedish Research Council
Note

QC 20161014

Available from: 2016-10-14 Created: 2016-10-14 Last updated: 2017-11-29Bibliographically approved

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