arXiv subjects

Andrew Akeroyd

Publications and source records attributed to Andrew Akeroyd.

3 recordsLinked to original sources

arXiv2002

Single and pair production of MSSM Higgs bosons as a probe of scalar-pseudoscalar mixing at e+e- colliders

We study the associated production of the $A^0$ neutral CP--odd Higgs boson with a neutral gauge boson $Z$ as well as single production of $A^0$ via $e^+e^- \to ν_e {\barν}_e A^0$ at the one loop level in the Minimal Supersymmetric Standard Model (MSSM). We show that the MSSM cross--section may be enhanced by light SUSY particles. Then we study the production processes $e^+e^-\to H^0_iZ$, $H^0_iν_e\bar ν_e$ and $H^0_iH^0_j$ in the context of the MSSM with scalar-pseudoscalar mixing. In a given channel we show that the cross--section for all i (=1,2,3) can be above 0.1 fb provided $M_{H_{2,3}}\la 300$ GeV. This should be detectable at a Next Linear Collider and would provide evidence for scalar--pseudoscalar mixing.

hep-ph↗

arXiv2000

Note on tree-level unitarity in the General Two Higgs Doublet Model

Tree-level unitarity constraints on the masses of the Higgs bosons in the general Two Higgs Doublet Model (THDM) are studied. We first consider the case where the Higgs potential is invariant under a discrete symmetry transformation, and derive strong constraints on the mass of the lightest CP-even Higgs boson ($M_h$) as a function of $\tanβ$. We then show that the inclusion of the discrete symmetry breaking term weakens the mass bounds considerably. It is suggested that a measurement of $M_h$ and $\tanβ$ may enable discrimination between the two Higgs potentials.

hep-ph↗

arXiv1998

Yukawa coupling corrections to the decay $H^+ \to W^+ A^0$

We compute the fermionic radiative contributions to the decay $H^+ \to W^{+(*)} A^0$ in the framework of models with two Higgs doublets (2HDM), for the case of an on-shell and off-shell W. We show that, in the majority of the cases, current measurements of the $ρ$ parameter suggest $M_{H^{\pm}}\ge M_A$ and such decays could invalidate current charged Higgs searches or aid detection in the region $M_{H^{\pm}}\approx M_W$. We find that the radiative corrections may approach 50% for small values of $\tanβ$.

hep-ph↗