Search for excited electrons and muons in √s=8 TeV proton-proton collisions with the ATLAS detector

Aad, G. and Abajyan, T. and Abbott, B. and Abdallah, J. and Abdel, Khalek S. and Abdinov, O. and Aben, R. and Abi, B. and Abolins, M. and Abouzeid, O. S. and Abramowicz, H. and Abreu, H. and Abulaiti, Y. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adye, T. and Aefsky, S. and Agatonovic-Jovin, T. and Aguilar-Saavedra, J. A. and Agustoni, M. and Ahlen, S. P. and Ahmad, A. and Ahmadov, F. and Ahsan, M. and Aielli, G. and Åkesson, T. P. A. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2013) Search for excited electrons and muons in √s=8 TeV proton-proton collisions with the ATLAS detector. NEW JOURNAL OF PHYSICS, 15. ISSN 1367-2630

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Abstract

The ATLAS detector at the LHC 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 fb 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.

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