2HDM AND ENHANCED RATES IN γγ CHANNEL

摘要

We examine maximum enhancement that can be achieved in the ZZ and γγ channels for a two-Higgs-doublet model Higgs boson with a mass near 125 GeV. Theoretical constraints restrict substantially the possibilities for enhancing the gg → h → γγ or gg → H → γγ signal relative to that for the SM Higgs. We find enhanced rates in the γγ final state for the h in the Type Ⅰ 2HDM - the largest [gg → h → γγ]/[gg → h_(smγγ)] ratio found is of the order of ～ 1.3, when tan β = 4 or 20 and the charged Higgs boson has its minimal LEP-allowed value of m_H ± = 90 GeV.