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

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 S. 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

1 CPPM - Centre de Physique des Particules de Marseille

2 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules

3 CC-IN2P3 - Centre de Calcul de l'IN2P3

4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

5 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

6 NIPNE - Horia Hulubei National Institute of Physics and Nuclear Engineering

7 LAL - Laboratoire de l'Accélérateur Linéaire

Abstract : 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.

Document type :

Journal articles

Domain :

Physics [physics] / High Energy Physics - Experiment [hep-ex]

Complete list of metadatas

http://hal.in2p3.fr/in2p3-01186567
Contributor : Claudine Bombar <>
Submitted on : Tuesday, August 25, 2015 - 11:36:43 AM
Last modification on : Tuesday, November 5, 2019 - 4:32:43 PM

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

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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

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