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arXiv · 2107.04858

Higgs boson decays to a fermion pair and a polarized $Z$ boson at NLO accuracy

Zi-Qiang Chen·Qi-Ming Feng·Cong-Feng Qiao
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Abstract

In this paper, we investigate the Higgs boson decay process $H\to f\bar{f}Z\to f\bar{f}\mu^-\mu^+$, where $f$ denotes any light fermions, at the next-to-leading order (NLO) accuracy. The calculation is performed within the framework of single-pole approximation, in which the contributions of different polarization states of the $Z$ boson are considered separately. Numerical results show that, by taking appropriate cut, the non-resonant background is negligible, and the NLO corrections are $1\%$--$4\%$ of the LO contributions. We also find that the inclusion of NLO corrections can greatly reduce the dependence on the electroweak coupling scheme, and enhance the prediction reliability. We formulate a method for the extraction of the pseudo-observable $\Gamma^{H\to ffZ}$ from the $f\bar{f}\mu^-\mu^+$ signal.

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Zi-Qiang Chen, Qi-Ming Feng, Cong-Feng Qiao. 2021-07-10. Higgs boson decays to a fermion pair and a polarized $Z$ boson at NLO accuracy. https://arxiv.org/abs/2107.04858

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