Search for excited electrons and muons in $\sqrt {s}=8$ TeV proton–proton collisions with the ATLAS detector

UNSPECIFIED (2013) Search for excited electrons and muons in $\sqrt {s}=8$ TeV proton–proton collisions with the ATLAS detector. New Journal of Physics, 15: 093011. ISSN 1367-2630

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The ATLAS detector at the Large Hadron Collider is used to search for excited electrons and excited muons in the channel pp → ℓℓ* → ℓℓγ, assuming that excited leptons are produced via contact interactions. The analysis is based on 13 fb−1 of pp collisions at a centre-of-mass energy of 8 TeV. No evidence for excited leptons is found, and a limit is set at the 95% credibility level on the cross section times branching ratio as a function of the excited-lepton mass mℓ*. For mℓ* ≥ 0.8 TeV, the respective upper limits on σB(ℓ* → ℓγ) are 0.75 and 0.90 fb for the e* and μ* searches. Limits on σB are converted into lower bounds on the compositeness scale Λ. In the special case where Λ = mℓ*, excited-electron and excited-muon masses below 2.2 TeV are excluded.

Item Type:
Journal Article
Journal or Publication Title:
New Journal of Physics
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© CERN 2013 for the benefit of the ATLAS Collaboration, published under the terms of the Creative Commons Attribution 3.0 licence by IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Any further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation and DOI.
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Deposited On:
19 Dec 2013 09:48
Last Modified:
03 Mar 2024 01:13