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Weekly seminars

The 30 GeV Dimuon Excess at ALEPH

by Ken Lane (Boston Univ.)

jeudi 1 juin 2017 de à (Europe/Paris)
at Annecy-le-Vieux ( Auditorium )
9 chemin de Bellevue 74940 ANNECY LE VIEUX
Description
A two-Higgs-doublet model is proposed to describe the 30 GeV dimuon excess reported by Heister in his reanalysis of $Z \to \bar bb$ events in ALEPH data taken in 1992-95. The heavier CP-even Higgs $H$ is the 125 GeV Higgs boson discovered at the LHC. The model admits two options for describing the dimuon excess: (1) The lighter CP-even Higgs $h$ and the CP-odd state $\eta_A$ are almost degenerate and contribute to the 30 GeV excess. (2) Only the $h$ is at 30 GeV while $\eta_A$ and $H$ are degenerate at 125 GeV. The ALEPH data favor option 1. Testable predictions are presented for LHC as well as LEP experiments. A possible no-go theorem for models of this type is also discussed.