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.
Highlights
The decay of the standard model Higgs boson to a bottom quark pair has the largest branching ratio among all Higgs decay modes, approximately 58% [1]
The largest sensitivity to H → bbcan be gained from the boosted VH production, where V denotes a W or Z boson that is boosted along the transverse direction; their leptonic decays result in clean signatures which can be efficiently triggered on, while vetoing most of the multijet backgrounds [4,5]
ZHDY can be analytically evaluated without difficulty at the leading order (LO); we find that the scattering amplitudes for the Jz 1⁄4 0 state of the Z boson are 0; F2;3;6 are all 0
Summary
The decay of the standard model Higgs boson to a bottom quark pair (bb ) has the largest branching ratio among all Higgs decay modes, approximately 58% [1]. Very recently ATLAS and CMS have reported observed significances of 4.9σ and 4.8σ for the VHðbb Þ channel, and 5.4σ and 5.6σ for the H → bbdecay, respectively, in combinations with other Higgs production modes with their Run 1 and Run 2 data [6,7]. The observed significance for the two-lepton channel is 3.4σð1.9σÞ for ATLAS (CMS) with the 13 TeV and 79.8 fb−1 (41.3 fb−1) of data [6,7]. We present a procedure to maximally exploit this information and estimate the possible sensitivity gains to the LHC analyses
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