Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-14
Phys.Lett. B487 (2000) 151-154
Physics
High Energy Physics
High Energy Physics - Phenomenology
Paragraph added and other wording changed in introduction, some wording changes in text. Calculation unaffected. Version to ap
Scientific paper
10.1016/S0370-2693(00)00789-9
In the most general two-Higgs doublet model (generally referred to as Model III), tree level flavor changing neutral couplings exist. It has been noted that the most natural value for such a coupling is of the order of the geometric mean of the Yukawa couplings of the two fermions. Bounds on those couplings that involve the second and third generations, from $\tau,B,D$ and $\mu$ physics, are very weak and are not sensitive to this "natural" value. In this paper, it is pointed out that the process \mu\mu ---> \mu\tau, at a muon collider tuned to the scalar resonance, will easily reach this sensitivity if the scalar mass is below 140 GeV. Hundreds of events are expected for an integrated luminosity of an inverse femtobarn, and there appears to be no background. Failure to observe this process, if the scalar is below 140 GeV, would effectively rule out Model III.
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