Search for top quark decays t → qH, with H → γγ, in s = 13 √(s)=13 TeV pp collisions using the ATLAS detector

2017/07/31 by M. Aaboud, ATLAS Collaboration, G. Aad +98 · 33 citations
Physics and Astronomy · #Atlas (anatomy) #Atlas detector #Boson #Branching fraction #Hadron #Higgs boson #High-Energy Particle Collisions Research #Large Hadron Collider #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quark #Top quark #hep-ex

paper · pdf · doi:10.1007/jhep10(2017)129

published in Journal of High Energy Physics 2017(10) (Springer Nature) · 41 pages in total, author list starting page 25, 7 figures, 3 tables, submitted to JHEP. All figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2016-26/

openalex publication_date 2017/10/01 · arxiv created 2017/11/23 · arxiv updated 2017/11/29 · openalex created_date 2017/12/04 · openalex updated_date 2026/08/06

Abstract

This article presents a search for flavour-changing neutral currents in the decay of a top quark into an up-type (q = c, u) quark and a Higgs boson, where the Higgs boson decays into two photons. The proton-proton collision data set analysed amounts to 36.1 fb -1 at s = 13 TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for, where one top quark decays into qH and the other decays into bW . Both the hadronic and leptonic decay modes of the W boson are used. No significant excess is observed and an upper limit is set on the t cH branching ratio of 2.2 10 -3 at the 95% confidence level, while the expected limit in the absence of signal is 1.6 10 -3 . The corresponding limit on the tcH coupling is 0.090 at the 95% confidence level. The observed upper limit on the t uH branching ratio is 2.4 10 -3 .

Citations

• Snowmass 2013 Top quark working group report
• Flavor-changing top quark decays inR-parity-violating supersymmetric models
• Combined Measurement of the Higgs Boson Mass in pp Collisions at √(s)=7 and 8 TeV with the ATLAS and CMS Experiments
• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Event generation with SHERPA 1.1
• Loop induced flavor changing neutral decays of the top quark in a general two-Higgs-doublet model
• t→cV via SUSY FCNC couplings in the unconstrained MSSM
• Presentation of search results: theCLstechnique
• Supersymmetry-induced flavor-changing neutral-current top-quark processes at the CERN Large Hadron Collider
• The anti-ktjet clustering algorithm
• Weak Interactions with Lepton-Hadron Symmetry
• Parton distributions for the LHC run II
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Rare top quark decayst→cVin the top-color-assisted technicolor model

Cited by

• Probing for extra top Yukawa couplings in light of the tt¯h (125) observation