In the minimal supersymmetric standard model with three generations of fermions, there is a stringent upper bound on the mass of the lightest neutral Higgs $h$, and the mass of the charged Higgs $H^{+}$ must be close (within tens of GeV) to the heavier neutral Higgs $H$ and the pseudoscalar Higgs $A$. In this paper, we show that in the four generation minimal supersymmetric standard model, the upper bound on the $h$ mass is much higher, as high as 400 GeV, and $H^{+}$ is generally much heavier than the $A$, allowing the $H^{+}\to A{W}^{+}$ decay, potentially changing search strategies for both the charged Higgs and the pseudoscalar. The $H$ mass, on the other hand, remains within tens of GeV of the charged Higgs mass.

• Received 6 August 2009

DOI:https://doi.org/10.1103/PhysRevD.80.057701