Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/109253
Title: Search for H→γγ produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector
Authors: Santos, S. P. Amor dos 
Carvalho, J. 
Fiolhais, M. C. N. 
Galhardo, B. 
Veloso, F. 
Wolters, H. 
ATLAS Collaboration
Keywords: Higgs boson; Diphoton decay; t¯tH; Top quark; Yukawa coupling; tH
Issue Date: 2015
Publisher: Elsevier
Serial title, monograph or event: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume: 740
Abstract: A search is performed for Higgs bosons produced in association with top quarks using the diphoton decay mode of the Higgs boson. Selection requirements are optimized separately for leptonic and fully hadronic final states from the top quark decays. The dataset used corresponds to an integrated luminosity of 4.5 fb−1 of proton–proton collisions at a center-of-mass energy of 7 TeV and 20.3 fb−1 at 8 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. No significant excess over the background prediction is observed and upper limits are set on the tt¯H production cross section. The observed exclusion upper limit at 95% confidence level is 6.7 times the predicted Standard Model cross section value. In addition, limits are set on the strength of the Yukawa coupling between the top quark and the Higgs boson, taking into account the dependence of the tt¯H and tH cross sections as well as the H→γγ branching fraction on the Yukawa coupling. Lower and upper limits at 95% confidence level are set at −1.3 and +8.0 times the Yukawa coupling strength in the Standard Model.
URI: https://hdl.handle.net/10316/109253
DOI: 10.1016/j.physletb.2014.11.049
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

Show full item record

Page view(s)

39
checked on Apr 17, 2024

Download(s)

16
checked on Apr 17, 2024

Google ScholarTM

Check

Altmetric

Altmetric


This item is licensed under a Creative Commons License Creative Commons