arXiv subjects

Heath Pois

Publications and source records attributed to Heath Pois.

2 recordsLinked to original sources

arXiv1995

2-Loop Supersymmetric Renormalization Group Equations Including R-parity Violation and Aspects of Unification

We present the complete 2-loop renormalization group equations of the supersymmetric standard model. We thus explicitly include the full set of $R $-parity violating couplings, including $κ_iL_iH_2$. We use these equations to do a first study of $(a)$ gauge coupling unification, $(b)$ bottom-tau unification, $(c)$ the fixpoint structure of the top quark Yukawa coupling, and (d) two-loop bounds from perturbative unification. We find significant shifts which can be larger than the effect from the top quark Yukawa coupling. The value of $α_3(M_Z)$ can change by $\pm5\%$. The $\tanβ$ region for bottom-tau unification and for the top quark IR quasi fixed point structure is significantly increased. For heavy scalar fermion masses ${\cal{O}}(1\tev)$ the limits on the $ΔL\not=0$ operators from perturbative unification are competitive with the indirect laboratory bounds. The two-loop correction to the bound on the $ΔB\not=0$ opertor is $+15\% $.

hep-ph↗

arXiv1993

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

The rare decay modes Higgs $\rightarrow$ four light fermions, and Higgs $\rightarrow$ single top-quark + three light fermions for $m_t 100\GeV$ 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 $e^+ e^-\rightarrow Z\,or\,ν\barν + (H\rightarrow t\bar b W^{(*)})$ 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.

hep-ph↗