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

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (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. Institute of Physics Publishing IOP 10.1088/1367-2630/18/7/073021

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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 mμ*. For mμ* between 1.3 TeV and 3.0 TeV, the upper limit on σB(μ* →μqq) is between 0.6 and 1 fb. Limits on σB are converted to lower bounds on the compositeness scale Λ . In the limiting case Λ=m μ*, 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 (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Haug, Sigve; Weber, Michael and Beck, Hans Peter

Subjects:

500 Science > 530 Physics
500 Science > 510 Mathematics

ISSN:

1367-2630

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

11 Aug 2017 15:01

Last Modified:

13 Aug 2017 02:16

Publisher DOI:

10.1088/1367-2630/18/7/073021

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.99982

URI:

https://boris.unibe.ch/id/eprint/99982

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