"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."

Ceradini, F., DI MICCO, B., Orestano, D., Petrucci, F., Salamanna, G., Bortolotto, V., et al. (2013). Search for excited electrons and muons in √s = 8 TeV proton–proton collisions with the ATLAS detector. NEW JOURNAL OF PHYSICS, 15, 1-32 [10.1088/1367-2630/15/9/093011].

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

CERADINI, Filippo;DI MICCO, Biagio;ORESTANO, DOMIZIA;PETRUCCI, FABRIZIO;SALAMANNA, GIUSEPPE;BORTOLOTTO, VALERIO;TROVATELLI, MONICA;DI NARDO, ROBERTO
2013-01-01

Abstract

"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."
Ceradini, F., DI MICCO, B., Orestano, D., Petrucci, F., Salamanna, G., Bortolotto, V., et al. (2013). Search for excited electrons and muons in √s = 8 TeV proton–proton collisions with the ATLAS detector. NEW JOURNAL OF PHYSICS, 15, 1-32 [10.1088/1367-2630/15/9/093011].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/267420
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