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.

G. Aad, E. Abat, B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, et al. (2013). Search for excited electrons and muons in $\sqrt {s}=8$ TeV proton–proton collisions with the ATLAS detector. NEW JOURNAL OF PHYSICS, 15, 093011-1-093011-33 [10.1088/1367-2630/15/9/093011].

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

BELLAGAMBA, LORENZO;BERTIN, ANTONIO;BOSCHERINI, DAVIDE;BRUNI, ALESSIA;BRUNI, GRAZIANO;CAFORIO, DAVIDE;P. Cwetanski;DE CASTRO, STEFANO;DI SIPIO, RICCARDO;FABBRI, LAURA;L. Fayard;FRANCHINI, MATTEO;GABRIELLI, ALESSANDRO;GIACOBBE, BENEDETTO;MASSA, IGNAZIO GIACOMO;MENGARELLI, ALBERTO;MONZANI, SIMONE;A. Oh;PICCININI, MAURIZIO;P. M. Prichard;RINALDI, LORENZO;ROMANO, MARINO;I. Satsounkevitch;SBARRA, CARLA;SBRIZZI, ANTONIO;SEMPRINI CESARI, NICOLA;SPIGHI, ROBERTO;P. Valente;VALENTINETTI, SARA;VILLA, MAURO;I. Vivarelli;ZOCCOLI, ANTONIO;
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* → 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.
2013
G. Aad, E. Abat, B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, et al. (2013). Search for excited electrons and muons in $\sqrt {s}=8$ TeV proton–proton collisions with the ATLAS detector. NEW JOURNAL OF PHYSICS, 15, 093011-1-093011-33 [10.1088/1367-2630/15/9/093011].
G. Aad; E. Abat; B. Abbott; J. Abdallah; A.A. Abdelalim; A. Abdesselam; O. Abdinov; B. Abi; M. Abolins; H. Abramowicz; H. Abreu; E. Acerbi; B.S. Achar...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/224075
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