Abstract
In this paper we investigate anomalous interactions of the Higgs boson with heavy fermions, employing shapes of kinematic distributions. We study the processes $pp \to t\bar{t} + H$, $b\bar{b} + H$, $tq+H$, and $pp \to H\to\tau^+\tau^-$, and present applications of event generation, re-weighting techniques for fast simulation of anomalous couplings, as well as matrix element techniques for optimal sensitivity. We extend the MELA technique, which proved to be a powerful matrix element tool for Higgs boson discovery and characterization during Run I of the LHC, and implement all analysis tools in the JHU generator framework. A next-to-leading order QCD description of the $pp \to t\bar{t} + H$ process allows us to investigate the performance of MELA in the presence of extra radiation. Finally, projections for LHC measurements through the end of Run III are presented.
Highlights
The discovery [1,2] of the H boson by the ATLAS and CMS experiments during Run I of the LHC marked an important milestone in the evolution of our understanding of fundamental particle physics
Any significant deviation from Standard Model (SM) predictions would reveal the existence of new physics in the Higgs sector and should to be classified according to its anomalous coupling structures
The probabilities P in Eqs. (7)–(11) are the physical cross sections given by the product of parton distribution functions convoluted with the partonic cross sections that are proportional to the squared matrix elements
Summary
The discovery [1,2] of the H boson by the ATLAS and CMS experiments during Run I of the LHC marked an important milestone in the evolution of our understanding of fundamental particle physics. We focus on applications to Run II of the LHC and extend our earlier developed techniques for HVV coupling measurements [61,62,63] to Hffcouplings in ttH, bbH, and tqH production, as well as to H → τþτ− decays. These matrix element techniques allow the optimal analysis of the dynamics in the production and decay processes.
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