Search for flavour-changing neutral current top-quark decays to $qZ$ in $pp$ collision data collected with the ATLAS detector at $\sqrt{s}=8$ TeV - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2016

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

G. Aad (1) , Z. Barnovska (2) , N. Berger (2) , M. Delmastro (2) , L. Di Ciaccio (2) , T.K.O. Doan (2) , S. Elles (2) , C. Goy (2) , T. Hryn’ova (2) , S. Jézéquel (2) , I. Koletsou (2) , R. Lafaye (2) , J. Leveque (2) , N. Massol (2) , G. Sauvage (2) , E. Sauvan (2) , O. Simard (2) , T. Todorov (2) , I. Wingerter-Seez (2) , G . Rahal (3) , D. Boumediene (4) , Emmanuel Busato (4) , D. Calvet (4) , S. Calvet (4) , J. Donini (4) , E. Dubreuil (4) , G. Gilles (4) , Ph. Gris (4) , H. Liao (4) , R. Madar (4) , D. Pallin (4) , S.M. Romano Saez (4) , C. Santoni (4) , D. Simon (4) , Timothée Theveneaux-Pelzer (4) , F. Vazeille (4) , S. Albrand (5) , J. Brown (5) , J. Collot (5) , S. Crépé-Renaudin (5) , P.A. Delsart (5) , C. Gabaldon (5) , M.H. Genest (5) , J.Y. Hostachy (5) , F. Ledroit-Guillon (5) , A. Lleres (5) , A. Lucotte (5) , F. Malek (5) , C. Monini (5) , J. Stark (5) , B. Trocmé (5) , M. Wu (5) , L. Alio (1) , M. Barbero (1) , Y. Coadou (1) , C. Diaconu (1) , Sara Diglio (1) , F. Djama (1) , O. Duccu (1, 6) , L. Feligioni (1) , J. Gao (1) , G.D. Hallewell (1) , F. Hubaut (1) , S.J. Kahn , E. B. F. G. Knoops (1) , E. Le Guirriec (1) , J. Liu (1) , K. Liu (1) , D. Madaffari (1) , K. Mochizuki (1) , E. Monnier (1) , S. Muanza (1) , Y. Nagai (1) , E. Nagy (1) , P. Pralavorio (1) , A. Rozanov (1) , T. Serre (1) , M. Talby (1) , R.E. Ticse Torres (1) , E. Tiouchichine (1) , S. Tisserant (1) , J. Toth (1) , F. Touchard (1) , L. Vacavant (1) , M.K. Ayoub (7) , A. Bassalat (7) , C. Bécot (7) , S. Binet (7) , C. Bourdarios (7) , D. Delgove (7) , J-B. de Vivie De Regie (7) , L. Duflot (7) , M. Escalier (7) , L. Fayard (7) , D. Fournier (7) , E.L. Gkougkousis (7) , J-F. Grivaz (7) , T. Guillemin (7) , F. Hariri (7) , S. Henrot-Versille (7) , J. Hrivnac (7) , L. Iconomidou-Fayard (7) , M. Kado (7) , A. Lounis (7) , N. Makovec (7) , N. Morange (7) , C. Nellist (7) , P. Petroff (7) , L. Poggioli (7) , P. Puzo (7) , A. Renaud (7) , D. Rousseau (7) , G. Rybkin (7) , A.C. Schaffer (7) , E. Scifo (7) , L. Serin (7) , S. Simion (7) , R. Tanaka (7) , D. Zerwas (7) , Zhongkai Zhang (7) , Y. Zhao (7) , E. Yatsenko (2)
G. Aad
N. Berger
C. Goy
T. Hryn’ova
S. Calvet
Y. Coadou
S.J. Kahn
  • Fonction : Auteur
D. Rousseau

Résumé

A search for the flavour-changing neutral-current decay $t\to qZ$ 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 $\sqrt{s}=8$ 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 $t\to qZ$ ($q=u,c$) channel and the other through the dominant Standard Model mode $t\to bW$ 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 $t\to qZ$ branching ratio of $7\times 10^{-4}$ ($8\times 10^{-4}$) is set at the 95% confidence level.

Dates et versions

in2p3-01186567 , version 1 (25-08-2015)

Identifiants

Citer

G. Aad, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. Search for flavour-changing neutral current top-quark decays to $qZ$ in $pp$ collision data collected with the ATLAS detector at $\sqrt{s}=8$ TeV. European Physical Journal C: Particles and Fields, 2016, 76, pp.12. ⟨10.1140/epjc/s10052-015-3851-5⟩. ⟨in2p3-01186567⟩
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