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

Aad, G; Abbott, B.; Abdallah, J; Abdinov, O; Abeloos, B; Aben, R; Åkesson, Torsten LU ; Bocchetta, Simona LU ; BRYNGEMARK, LENE LU and Doglioni, Caterina LU , et al. (2016) In New Journal of Physics 18(7).
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... (More)
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. © 2016 CERN for the benefit of the ATLAS Collaboration. (Less)
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excited leptons, lepton compositeness, leptoquarks, Elementary particles, Tellurium compounds, Branching ratio, Centre-of-mass energies, Compositeness, Confidence levels, Contact interaction, Excited leptons, Large Hadron Collider, Leptoquarks, Charged particles
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New Journal of Physics
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18
issue
7
publisher
IOP Publishing Ltd.
external identifiers
  • scopus:84979678889
ISSN
1367-2630
DOI
10.1088/1367-2630/18/7/073021
language
English
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yes
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0daf4f43-3beb-453b-b12e-8fc53eca412e
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2017-06-29 08:05:41
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2017-11-14 09:56:16
@article{0daf4f43-3beb-453b-b12e-8fc53eca412e,
  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. © 2016 CERN for the benefit of the ATLAS Collaboration.},
  articleno    = {073021},
  author       = {Aad, G and Abbott, B. and Abdallah, J and Abdinov, O and Abeloos, B and Aben, R and Åkesson, Torsten and Bocchetta, Simona and BRYNGEMARK, LENE and Doglioni, Caterina and Floderus, Anders and Hawkins, Anthony and Hedberg, Vincent and Ivarsson, Jenny and Jarlskog, Göran and Lytken, Else and Mjörnmark, Ulf and Smirnova, Oxana and Viazlo, Oleksandr and , },
  issn         = {1367-2630},
  keyword      = {excited leptons,lepton compositeness,leptoquarks,Elementary particles,Tellurium compounds,Branching ratio,Centre-of-mass energies,Compositeness,Confidence levels,Contact interaction,Excited leptons,Large Hadron Collider,Leptoquarks,Charged particles},
  language     = {eng},
  number       = {7},
  publisher    = {IOP Publishing Ltd.},
  series       = {New Journal of Physics},
  title        = {A search for an excited muon decaying to a muon and two jets in pp collisions at √ s = 8 TeV with the ATLAS detector},
  url          = {http://dx.doi.org/10.1088/1367-2630/18/7/073021},
  volume       = {18},
  year         = {2016},
}