Abstract
We present predictions for the Higgs boson decay into four bottom quarks in the standard model and via light exotic scalars retaining full bottom-quark mass dependence. In the SM the decay can be induced either by the Yukawa couplings of bottom quarks and top quarks or the electroweak couplings. We calculate the partial decay width and various differential distributions up to next-to-leading order in QCD. We find large QCD corrections for decay via Yukawa couplings, as large as 90% for the partial decay width, and reduced scale variations. The results of this paper are therefore helpful for the measurement of this multi-jets final state at future Higgs factory of electron-positron colliders. We also propose several observables that can differentiate the SM decay channel and the exotic decay channel and compare their next-to-leading order predictions.
Highlights
To Higgs boson production in association with a jet in the heavy top-quark limit [18,19,20,21], and the next-to-leading order (NLO) corrections to Higgs boson pair production with full top-quark mass dependence [22] have been known for some time
We present predictions for the Higgs boson decay into four bottom quarks in the standard model and via light exotic scalars retaining full bottom-quark mass dependence
We study in details decays of the standard model Higgs boson to two bottom quark and anti-quark pairs
Summary
We use onshell scheme for renormalization of the quark or gluon fields and masses except for masses in Yukawa couplings, when calculating the QCD radiative corrections. Under the effective theory the leading order (LO) Feynman diagrams for the Higgs boson decaying into four bottom quarks are shown in figure 1. Those diagrams can be obtained with interchanges of identical particles are not shown for simplicity. In this calculation the squared amplitudes needed for a next-to-leading order QCD calculation are generated automatically with program GoSam 2.0 [58], including for the one-loop virtual corrections and the real corrections. We use the dipole subtraction method with massive quarks [63] for handling the QCD real corrections
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