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Four-Dimensional CT Analysis Using Sequential 3D-3D Registration

Four-Dimensional CT Analysis Using Sequential 3D-3D Registration

Published on: November 23, 2019

Unravelling tth via the matrix element method.

Pierre Artoisenet¹, Priscila de Aquino, Fabio Maltoni

¹Nikhef Theory Group, Science Park 105, 1098 XG Amsterdam, Netherlands.

Physical Review Letters

|September 17, 2013

Summary

This summary is machine-generated.

Investigating Higgs boson production with top-antitop pairs at the LHC is crucial. The matrix element method enhances sensitivity to this rare signal, even in complex environments.

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Area of Science:

High Energy Physics
Particle Physics
Standard Model Physics

Background:

Associated production of the Higgs boson with a top-antitop pair (ttH) is a key channel for studying the Higgs boson's nature.
Experimental observation is challenging due to low event rates, complex multijet final states, and significant backgrounds.
The Standard Model predicts the largest ttH signal via Higgs decays to bottom quarks (h→bb), resulting in a W+W-bbbb signature overwhelmed by top-antitop plus jets (tt + jets) backgrounds.

Purpose of the Study:

To evaluate the effectiveness of the matrix element method for enhancing the sensitivity of ttH production observation.
To demonstrate the application of the matrix element method in discriminating the ttH signal from combinatorial and tt + jets backgrounds.
To assess the potential for future LHC runs to achieve significant sensitivity to this signature.

Main Methods:

Application of the matrix element method to exploit theoretical information of signal and background processes.
Analysis of the complex multijet final state characteristic of ttH production with h→bb.
Simulation and comparison of different decay channels, focusing on leptonic W boson decays.

Main Results:

The matrix element method can be efficiently applied to discriminate the ttH signal against combinatorial and tt + jets backgrounds, despite the final state complexity.
A moderate integrated luminosity in the next LHC run is sufficient to achieve significant sensitivity.
The signature involving both W bosons decaying leptonically can become as sensitive as the single-lepton signature.

Conclusions:

The matrix element method is a powerful tool for improving the sensitivity to rare processes like ttH production.
Future LHC runs with moderate luminosity will enable crucial measurements of ttH production.
Enhanced sensitivity in ttH studies will provide deeper insights into the properties of the Higgs boson.