Search for excited electrons and muons in root s=8 TeV proton-proton collisions with the ATLAS detector
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KünyeAad, G, Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O. ... ATLAS Collaboration. (2013). Search for excited electrons and muons in root s=8 TeV proton-proton collisions with the ATLAS detector. New Journal of Physics, Volume 15, pp. 1-32. http://dx.doi.org/10.1088/1367-2630/15/9/093011.
The ATLAS detector at the Large Hadron Collider is used to search for excited electrons and excited muons in the channel pp -> ll* -> ll gamma, 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 m(l*). For m(l*) >= 0.8 TeV, the respective upper limits on sigma B(l(*) -> l gamma) are 0.75 and 0.90 fb for the e* and mu* searches. Limits on sigma B are converted into lower bounds on the compositeness scale 3. In the special case where Lambda = m(l*), excited-electron and excited-muon masses below 2.2 TeV are excluded.