Lower Bound on the Pseudoscalar Mass in the Minimal Supersymmetric Standard Model

Details Lower Bound on the Pseudoscalar Mass in the Minimal Supersymmetric Standard Model Lower Bound on the Pseudoscalar Mass in the Minimal Supersymmetric Standard Model

1997-07-29

arxiv.org/abs/hep-ph/9707512v2

Phys.Rev.D56:5306-5309,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages including 2 figs, reference added

Scientific paper

10.1103/PhysRevD.56.R5306

In the Higgs sector of the Minimal Supersymmetric Standard Model, the mass of the pseudoscalar $A$ is an independent parameter together with $\tan \beta \equiv v_2/v_1$. If $m_A$ is small, then the process $e^+ e^- \to h + A$ is kinematically allowed and is suppressed only if $\tan \beta$ is small. On the other hand, the mass of the charged Higgs boson is now near $M_W$, and the decay $t \to b + h^+$ is enhanced if $\tan \beta$ is small. Since the former has not been observed, and the branching fraction of $t \to b + W$ cannot be too small (by comparing the experimentally derived $t \bar t$ cross section from the leptonic channels with the theoretical prediction), we can infer a phenomenological lower bound on $m_A$ of at least 60 GeV for all values of $\tan \beta$.

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