# Measuring the signal strength in $t\bar{t}H$ with $H \to b\bar{b}$

Moretti, Niccolo; Petrov, Petar; Pozzorini, Stefano; Spannowsky, Michael (2016). Measuring the signal strength in $t\bar{t}H$ with $H \to b\bar{b}$. Physical Review D (Particles, Fields, Gravitation and Cosmology), 93:014019.

## Abstract

A precise measurement of the Higgs boson couplings to bottom and top quarks is of paramount importance during the upcoming LHC runs. We present a comprehensive analysis for the Higgs production process in association with a semileptonically decaying top-quark pair and subsequent Higgs boson decay into bottom quarks. Due to the highly complex final state and large Standard Model backgrounds, measuring the signal strength in this process is known to be challenging. To maximize the sensitivity, we analyze different, statistically independent, phase space regions, where one or more of the heavy resonances are boosted. This allows us to employ jet substructure techniques, which help to reduce large $t\bar{t}+X$ backgrounds. We find that combining several $t\bar{t}H(b\bar{b}$) phase space regions will allow one to measure deviations of the Standard Model signal strength of order 20% with $3 ab^{−1}$.

A precise measurement of the Higgs boson couplings to bottom and top quarks is of paramount importance during the upcoming LHC runs. We present a comprehensive analysis for the Higgs production process in association with a semileptonically decaying top-quark pair and subsequent Higgs boson decay into bottom quarks. Due to the highly complex final state and large Standard Model backgrounds, measuring the signal strength in this process is known to be challenging. To maximize the sensitivity, we analyze different, statistically independent, phase space regions, where one or more of the heavy resonances are boosted. This allows us to employ jet substructure techniques, which help to reduce large $t\bar{t}+X$ backgrounds. We find that combining several $t\bar{t}H(b\bar{b}$) phase space regions will allow one to measure deviations of the Standard Model signal strength of order 20% with $3 ab^{−1}$.

## Citations

4 citations in Web of Science®
3 citations in Scopus®

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2016 18 Feb 2016 16:16 15 Jun 2016 00:32 American Physical Society 1550-7998 https://doi.org/10.1103/PhysRevD.93.014019 arXiv:1510.08468v1
Permanent URL: https://doi.org/10.5167/uzh-121835