Search for pair production of a new heavy quark that decays into a $W$ boson and a light quark in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector

Abstract : A search is presented for pair production of a new heavy quark ($Q$) that decays into a $W$ boson and a light quark ($q$) in the final state where one $W$ boson decays leptonically (to an electron or muon plus a neutrino) and the other $W$ boson decays hadronically. The analysis is performed using an integrated luminosity of 20.3 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 8$ TeV collected by the ATLAS detector at the LHC. No evidence of $Q\bar{Q}$ production is observed. New chiral quarks with masses below 690 GeV are excluded at 95% confidence level, assuming BR$(Q\to Wq)=1$. Results are also interpreted in the context of vectorlike quark models, resulting in the limits on the mass of a vectorlike quark in the two-dimensional plane of BR$(Q\to Wq)$ versus BR$(Q\to Hq)$.
Type de document :
Article dans une revue
Physical Review D, American Physical Society, 2015, 92, pp.112007. 〈10.1103/PhysRevD.92.112007〉

http://hal.in2p3.fr/in2p3-01199447
Contributeur : Claudine Bombar <>
Soumis le : mardi 15 septembre 2015 - 14:16:28
Dernière modification le : mardi 13 février 2018 - 13:28:06

Citation

G. Aad, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. Search for pair production of a new heavy quark that decays into a $W$ boson and a light quark in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector. Physical Review D, American Physical Society, 2015, 92, pp.112007. 〈10.1103/PhysRevD.92.112007〉. 〈in2p3-01199447〉

Métriques

Consultations de la notice