Higgs-Boson Decay to Four Fermions Including a Single Top Quark Below $t \bar t$ Threshold

Details Higgs-Boson Decay to Four Fermions Including a Single Top Quark Below $t \bar t$ Threshold Higgs-Boson Decay to Four Fermions Including a Single Top Quark Below $t \bar t$ Threshold

1993-03-18

arxiv.org/abs/hep-ph/9303277v1

Phys.Rev. D47 (1993) 3886-3897

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, 6 figures (figures available upon request); VAND-TH-93/4

Scientific paper

10.1103/PhysRevD.47.3886

The rare decay modes Higgs $\rightarrow$ four light fermions, and Higgs $\rightarrow$ single top-quark + three light fermions for $m_t100\GeV$ makes the second amplitude competitive or dominant for most $M_H,m_t$ values. Thus the Higgs decay rate to single top directly probes the SM universal mechanism generating both gauge boson and fermion masses, and offers a means to infer the Higgs-$t \bar t$ Yukawa coupling when $H\rightarrow t \bar t$ is kinematically disallowed. We find that the modes $pp\rightarrow Xt\bar t(H\rightarrow t\bar b W^{(*)})$ at the SSC, and $e^+ e^-\rightarrow Z\,or\,\nu\bar{\nu} + (H\rightarrow t\bar b W^{(*)})$ at future high energy, high luminosity colliders, may be measureable if $2m_t$ is not too far above $M_H$. We classify non-standard Higgses as gaugeo-phobic, fermio-phobic or fermio-philic, and discuss the Higgs$\rightarrow$ single top rates for these classes.

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