The 30 GeV Dimuon Excess at ALEPH

by Kenneth Lane (Boston University)

Friday 26 May 2017, 14:00 → 15:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

A simple variation of a two-Higgs-doublet model is proposed to describe the 30 GeV dimuon excess reported by Heister in his reanalysis of Z  to bottom-antibottom 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 approximately degenerate and contribute to the 30 GeV excess. (2) Only the h is at 30 GeV while the eta_A and H are approximately degenerate at 125 GeV. The ALEPH data favor option 1. Testable predictions are presented for LHC as well as LEP experiments. A potential no-go theorem for models of this type is also discussed

Dimuon_CERN.pdf