t(t)over-barH Coupling Measurement with the ATLAS Detector at the LHC

被引：0
|
作者：
Hadef, Asma [1 ]
机构：
[1] Aix Marseille Univ, Ctr Phys Particules Marseille, CPPM, CNRS,IN2P3, Marseille, France
来源：
6TH INTERNATIONAL CONFERENCE ON NEW FRONTIERS IN PHYSICS (ICNFP 2017) | 2018年 / 182卷
关键词：
D O I：
10.1051/epjconf/201818202052
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The Higgs boson was discovered on the 4th of July 2012 with a mass around 125 GeV by ATLAS and CMS experiments at LHC. Determining the Higgs properties (production and decay modes, couplings, ...) is an important part of the high-energy physics programme in this decade. A search for the Higgs boson production in association with a top quark pair (t (t) over barH) at ATLAS [1] is summarized in this paper at an unexplored center-of-mass energy of 13 TeV, which could allow a first direct measurement of the top quark Yukawa coupling and could reveal new physics. The t (t) over barH analysis in ATLAS is divided into 3 channels according to the Higgs decay modes: H -> Hadrons, H -> Leptons and H > Photons. The best-fit value of the ratio of observed and Standard Model cross sections of t (t) over barH production process, using 2015-2016 data and combining all t (t) over barH final states, is 1.8 +/- 0.7, corresponds to 2.8 sigma (1.8 sigma) observed (expected) significance.
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页数：10
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