Role of the $Z$ polarization in the $H \rightarrow b\bar{b}$ measurement

TL;DR

This paper demonstrates that analyzing the polarization of the Z boson in the ZH production channel can significantly enhance the discrimination of signal from background, improving the precision of H→bb̄ measurements at the LHC.

Contribution

It introduces the use of Z boson polarization information to improve signal extraction in H→bb̄ analyses, which is not considered in current LHC studies.

Findings

Z polarization analysis improves signal-to-background discrimination.

Inclusion of polarization data increases measurement precision.

Method enhances the sensitivity of H→bb̄ detection in ZH channel.

Abstract

It is widely known that the $ZH$ production channel provides a promising probe to the $H \rightarrow b\bar{b}$ decay at the LHC, when the Higgs and the $Z$ bosons are highly boosted along the transverse direction. We show how information on the $Z$ boson polarization -- that is disregarded in the current LHC analyses -- can relevantly improve the signal from background discrimination, helping us to observe and achieve a larger precision for the $H \rightarrow b\bar{b}$ measurement in the $Z(\ell\ell)H$ channel.