Abstract
First results of a search for the Standard Model Higgs boson produced in association with a top quark-antiquark pair (ttH) in proton-proton collisions at a center of mass energy of 13 TeV is presented. The decays of Higgs boson into two photons, bottom quark-antiquark pair and multileptons via WW, ZZ and tautau pairs are analysed separately and then combined. The results are presented in terms of the best-fit signal strength relative to the Standard Model prediction and the observed and expected upper limits at the 95% confidence level are extracted.
Highlights
The discovery of the Higgs boson at CERN [1, 2] is one of the major achievements in the history of particle physics and the focus is on the precise measurement of its properties, in particular its couplings to other particles
The top quark and Higgs boson are the heaviest particles yet discovered and the leading experiments of today, such as ATLAS and CMS at CERN, are able to provide a direct measurement of their coupling through the study of the associated production in the ttH process
A direct measurement of top-Higgs coupling in the associated production can set constraints on the new physics with respect to the gg → Higgs process
Summary
The discovery of the Higgs boson at CERN [1, 2] is one of the major achievements in the history of particle physics and the focus is on the precise measurement of its properties, in particular its couplings to other particles. The top quark and Higgs boson are the heaviest particles yet discovered and the leading experiments of today, such as ATLAS and CMS at CERN, are able to provide a direct measurement of their coupling through the study of the associated production in the ttH process. A direct measurement of top-Higgs coupling in the associated production can set constraints on the new physics with respect to the gg → Higgs process. Three different final states are considered, corresponding to the decays of Higgs boson to pair of photons, pair of bottom quarks or the multilepton final state from the decays to WW, ZZ and ττ These processes, very rare, represent some of the cleanest signatures for studying the associated top-Higgs production. The combination of the results of these three signatures is performed
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