Journal articles
Search for single production of vector-like quarks decaying into $Wb$ in $pp$ collisions at $\sqrt{s} =$ 8 TeV with the ATLAS detector
G. Aad
1
Z. Barnovska
2
N. Berger
2
M. Delmastro
2
L. Di Ciaccio
2
S. Elles
2
T. Guillemin
2
K. Grevtsov
2
T. Hryn’ova
2
S. Jézéquel
2
I. Koletsou
2
R. Lafaye
2
Jérémy Lévêque
2
P. Mastrandea
2
G. Sauvage
2
E. Sauvan
2
O. Simard
2
T. Todorov
2
I. Wingerter-Seez
2
E. Yatsenko
2
S. Albrand
3
C. Camincher
3
J. Collot
S. Crépé-Renaudin
3
P.A. Delsart
3
C. Gabaldon
3
M.H. Genest
3
J.Y. Hostachy
3
F. Ledroit-Guillon
3
A. Lleres
3
A. Lucotte
3
F. Malek
3
E. Petit
3
J. Stark
3
B. Trocmé
3
M. Wu
3
G. Aad 1
Author IdHAL : georges-aad ORCID : https://orcid.org/0000-0002-6665-4934
Z. Barnovska 2
Author
N. Berger 2
Author IdHAL : nicolas-berger
M. Delmastro 2
Author
T. Hryn’ova 2
Author IdHAL : thrynova ORCID : https://orcid.org/0000-0001-5914-8614
S. Jézéquel 2
Author
I. Koletsou 2
Author
R. Lafaye 2
Author
S. Albrand 3
Author
C. Camincher 3
Author
J. Collot
Author
S. Crépé-Renaudin 3
Author IdHAL : sabine-crepe ORCID : https://orcid.org/0000-0001-5980-5805
P.A. Delsart 3
Author
C. Gabaldon 3
Author
M.H. Genest 3
Author IdHAL : marie-helene-genest ORCID : https://orcid.org/0000-0002-4098-2024
J.Y. Hostachy 3
Author
F. Ledroit-Guillon 3
Author
A. Lleres 3
Author
A. Lucotte 3
Author
F. Malek 3
Author IdHAL : fairouz-malek ResearcherId : http://www.researcherid.com/rid/E-4410-2018 IdRef : https://www.idref.fr/084171219 ORCID : https://orcid.org/0000-0002-0948-5775
1
CPPM - Centre de Physique des Particules de Marseille (163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09 - France)
- AMU - Aix Marseille Université : UMR7346 (Aix-Marseille Université Jardins du Pharo 58 Boulevard Charles Livon 13284 Marseille cedex 7 - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- CNRS - Centre National de la Recherche Scientifique : UMR7346 (France)
2
LAPP - Laboratoire d'Annecy de Physique des Particules (9 Chemin de Bellevue - BP 110 - 74941 Annecy-le-Vieux CEDEX - France - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- USMB [Université de Savoie] [Université de Chambéry] - Université Savoie Mont Blanc (27, rue Marcoz - 73000 Chambéry - France)
- CNRS - Centre National de la Recherche Scientifique : UMR5814 (France)
3
LPSC - Laboratoire de Physique Subatomique et de Cosmologie (53 avenue des Martyrs - 38026 Grenoble Cedex - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology (46 avenue Félix Viallet 38031 Grenoble Cedex 1 - France)
- UGA [2016-2019] - Université Grenoble Alpes [2016-2019] (CS 40700 - 38058 Grenoble cedex - France)
- CNRS - Centre National de la Recherche Scientifique : UMR5821 (France)
Abstract : A search for singly produced vector-like $Q$ quarks, where $Q$ can be either a $T$ quark with charge $+2/3$ or a $Y$ quark with charge $-4/3$, is performed in proton-proton collisions recorded with the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 20.3 fb$^{-1}$ and was produced with a centre-of-mass energy of $\sqrt{s}=8$ TeV. This analysis targets $Q \to Wb$ decays where the $W$ boson decays leptonically. A veto on massive large-radius jets is used to reject the dominant $t\bar{t}$ background. The reconstructed $Q$-candidate mass, ranging from 0.4 to 1.2 TeV, is used in the search to discriminate signal from background processes. No significant deviation from the Standard Model expectation is observed, and limits are set on the $Q \to Wb$ cross-section times branching ratio. The results are also interpreted as limits on the $QWb$ coupling and the mixing with the Standard Model sector for a singlet $T$ quark or a $Y$ quark from a doublet. $T$ quarks with masses below 0.95 TeV are excluded at 95% confidence level, assuming a unit coupling and a BR$(T\rightarrow Wb) = 0.5$, whereas the expected limit is 1.10 TeV.
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Journal articles
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http://hal.in2p3.fr/in2p3-01276335
Contributor : Claudine Bombar <>
Submitted on : Friday, February 19, 2016 - 11:17:38 AM
Last modification on : Saturday, January 2, 2021 - 11:26:02 PM
Contributor : Claudine Bombar <>
Submitted on : Friday, February 19, 2016 - 11:17:38 AM
Last modification on : Saturday, January 2, 2021 - 11:26:02 PM
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- HAL Id : in2p3-01276335, version 1
- DOI : 10.1140/epjc/s10052-016-4281-8
- ARXIV : 1602.05606
Citation
G. Aad, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. Search for single production of vector-like quarks decaying into $Wb$ in $pp$ collisions at $\sqrt{s} =$ 8 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2016, 76, pp.442. ⟨10.1140/epjc/s10052-016-4281-8⟩. ⟨in2p3-01276335⟩
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