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

CollaborationWith : Ancu, Lucian Stefan / Bell, William / Bilbao De Mendizabal, Javier / Calace, Noemi / Clark, Allan Geoffrey / Coccaro, Andrea / Delitzsch, Chris Malena / Della Volpe, Domenico / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / March Ruiz, Luis / Mermod, Philippe / Miucci, Antonio / Nackenhorst, Olaf / Nessi, Marzio / Paolozzi, Lorenzo / Ristic, Branislav / Schramm, Steven / Sfyrla, Anna / Vallecorsa, Sofia / Wu, Xin
Published in New journal of physics. 2016, vol. 18, no. 7, p. 073021-73042
Collection Open Access - SCOAP3
Abstract A new search signature for excited leptons is explored. Excited muons are sought in the channel , 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 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 . For between 1.3 and 3.0 TeV, the upper limit on ) is between 0.6 and 1 fb. Limits on are converted to lower bounds on the compositeness scale Λ. In the limiting case , excited muons with a mass below 2.8 TeV are excluded. With the same model assumptions, these limits at larger masses improve upon previous limits from traditional searches based on the gauge-mediated decay .
arXiv: 1601.05627
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ATLAS COLLABORATION. A search for an excited muon decaying to a muon and two jets in pp collisions at with the ATLAS detector. In: New journal of physics, 2016, vol. 18, n° 7, p. 073021-73042. doi: 10.1088/1367-2630/18/7/073021 https://archive-ouverte.unige.ch/unige:85590

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Deposited on : 2016-08-02

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