Energy Spectra and Energy Correlations in the Decay $H\to ZZ\to μ^+μ^-μ^+μ^-$

Details Energy Spectra and Energy Correlations in the Decay $H\to ZZ\to μ^+μ^-μ^+μ^-$ Energy Spectra and Energy Correlations in the Decay $H\to ZZ\to μ^+μ^-μ^+μ^-$

1994-09-23

arxiv.org/abs/hep-ph/9409396v1

Z.Phys.C66:89-94,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages + 4 figures

Scientific paper

10.1007/BF01496583

It is shown that in the sequential decay $H\to ZZ\to (f_1\bar{f_1})+ (f_2\bar{f_2})$, the energy distribution of the final state particles provides a simple and powerful test of the $HZZ$ vertex. For a standard Higgs boson, the energy spectrum of any final fermion, in the rest frame of $H$, is predicted to be $d\Gamma /dx\sim 1+\beta^4-2(x-1)^2$, with $\beta = \sqrt{1-4m^2_Z/m^2_H}$ and $1-\beta \le x=4E/m_H\le 1+\beta $. By contrast, the spectrum for a pseudoscalar Higgs is $d\Gamma /dx \sim \beta^2+(x-1)^2$. There are characteristic energy correlations between $f_1$ and $f_2$ and between $f_1$ and $\bar{f_2}$. These considerations are applied to the ``gold--plated'' reaction $H\to ZZ\to \mu^+\mu^-\mu^+\mu^-$, including possible effects of CP--violation in the $HZZ$ coupling. Our formalism also yields the energy spectra and correlations of leptons in the decay $H\to W^+W^-\to l^+\nu_ll^- \bar{\nu_l}$.

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