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

The ATLAS collaboration, K. Cranmer, A. Haas, A. I. Mincer, P. Nemethy

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Article number073021
JournalNew Journal of Physics
Volume18
Issue number7
DOIs
StatePublished - Jul 1 2016

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muons
collisions
detectors
decay
center of mass
leptons
confidence
electric contacts
signatures
cross sections
interactions
energy

Keywords

  • excited leptons
  • lepton compositeness
  • leptoquarks

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

A search for an excited muon decaying to a muon and two jets in pp collisions at √ s = 8 TeV with the ATLAS detector. / The ATLAS collaboration; Cranmer, K.; Haas, A.; Mincer, A. I.; Nemethy, P.

In: New Journal of Physics, Vol. 18, No. 7, 073021, 01.07.2016.

Research output: Contribution to journalArticle

The ATLAS collaboration ; Cranmer, K. ; Haas, A. ; Mincer, A. I. ; Nemethy, P. / A search for an excited muon decaying to a muon and two jets in pp collisions at √ s = 8 TeV with the ATLAS detector. In: New Journal of Physics. 2016 ; Vol. 18, No. 7.
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