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.

Search for excited electrons and muons in root s=8 TeV proton-proton collisions with the ATLAS detector / G., A., T., A., B., A., J., A., S. A., K., O., A., R., A., B., A., M., A., O. S., A., H., A., H., A., Y., A., B. S., A., L., A., D. L., A., T. N., A., J., A., S., A., T., A., et al.. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 15:(2013), p. 093011. [10.1088/1367-2630/15/9/093011]

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

BAGNAIA, Paolo;BINI, Cesare;S. D. Castro;DIONISI, Carlo;GAUZZI, Paolo;GENTILE, Simonetta;GIAGU, Stefano;LACAVA, Francesco;LUCI, Claudio;MESSINA, Andrea;MONZANI, SIMONE;SOLFAROLI CAMILLOCCI, ELENA;VERDUCCI, MONICA;
2013

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.
2013
01 Pubblicazione su rivista::01a Articolo in rivista
Search for excited electrons and muons in root s=8 TeV proton-proton collisions with the ATLAS detector / G., A., T., A., B., A., J., A., S. A., K., O., A., R., A., B., A., M., A., O. S., A., H., A., H., A., Y., A., B. S., A., L., A., D. L., A., T. N., A., J., A., S., A., T., A., et al.. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 15:(2013), p. 093011. [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/11573/555822
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