Search for flavour-changing neutral current top-quark decays to qZ in pp collision data collected with the ATLAS detector at √s =8 TeV

0470657 - FZÚ 2017 RIV US eng J - Článek v odborném periodiku
Aad, G. - Abbott, B. - Abdallah, J. - Chudoba, Jiří - Havránek, Miroslav - Hejbal, Jiří - Jakoubek, Tomáš - Kepka, Oldřich - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek - Vrba, Václav … celkem 2855 autorů
Search for flavour-changing neutral current top-quark decays to qZ in pp collision data collected with the ATLAS detector at √s =8 TeV.
European Physical Journal C. Roč. 76, č. 1 (2016), s. 1-35, č. článku 12. ISSN 1434-6044. E-ISSN 1434-6052
Institucionální podpora: RVO:68378271
Klíčová slova: ATLAS * top: branching ratio * upper limit * CERN LHC Coll * experimental results * top --> quark Z0 * 8000 GeV-cms
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 5.297, rok: 2016

A search for the flavour-changing neutral-current decay t→qZ is presented. Data collected by the ATLAS detector during 2012 from proton–proton collisions at the Large Hadron Collider at a centre-of-mass energy of s√=8 TeV, corresponding to an integrated luminosity of 20.3 fb−1 , are analysed. Top-quark pair-production events with one top quark decaying through the t→qZ ( q=u,c ) channel and the other through the dominant Standard Model mode t→bW are considered as signal. Only the decays of the Z boson to charged leptons and leptonic W boson decays are used. No evidence for a signal is found and an observed (expected) upper limit on the t→qZ branching ratio of 7×10−4 ( 8×10−4 ) is set at the 95 % confidence level.

Trvalý link: http://hdl.handle.net/11104/0268231