PHYS08200604017 Manimala Mitra - Homi Bhabha National Institute

Decay modes Σ ± m 1
Σ ± m 2
Σ ± m 3
ν m H ± 0.381 0.475 0.475
e ± mA 0 0.251 2.30×10 −6 0.0
µ ± m A0 2.31×10 −6 0.126 0.126
τ m ± A0 2.31×10 −6 0.126 0.126
e ± mh 0 0.37 2.51×10 −6 0.0
µ ± m h0 3.39×10 −6 0.137 0.137
τ m ± h0 3.39×10 −6 0.137 0.137
Table3.4: DecaybranchingfractionsofΣ ± m 1
, Σ ± m 2
andΣ ± m 3
forM h 0=70,M H 0=150,M H ± =
170 GeV and M A 0 = 140 GeV. We have taken model parameters M 1 = 300 GeV and
M 2 = M 3 = 600 GeV.
Decay modes Σ 0 m 1
Σ 0 m 2
Σ 0 m 3
e ∓ m H± 0.381 4.35×10 −6 0.0
µ ∓ mH ± 3.51×10 −6 0.238 0.238
τm ∓H± 3.51×10 −6 0.238 0.238
ν m A 0 0.251 0.252 0.252
ν m h 0 0.368 0.272 0.272
Table3.5: DecaybranchingfractionsofΣ 0 m 1
, Σ 0 m 2
andΣ 0 m 3
forM h 0=70,M H 0=150,M H ± =
170 GeV and M A = 140 GeV. We have taken model parameters M 1 = 300 GeV and
M 2 = M 3 = 600 GeV.
the Higgs with the leptons and quarks are given in Appendix B. The interaction of Higgs
fields with the gauge fields comes from the Higgs kinetic terms and is the same as the general
two Higgs doublet model. Possible decay channels for the charged Higgs involve the
W ± and the neutral CP even Higgs. In the two Higgs doublet model, the W ± −H ∓ −H 0
coupling is proportional to sin(β −α), whereas W ± −H ∓ −h 0 coupling is proportional
to cos(β − α) [19]. In Appendix A, we have shown how constraint from neutrino mass
drives sinα ∼ sinβ ∼ 10 −6 . Therefore, in our model H ± → W ± H 0 is always suppressed,
irrespective of the Higgs mass. In fact, the only decay channel possible for the charged
Higgs in our model is H ± → W ± h 0 , for which the decay branching fraction
BR(H ± → W ± h 0 ) = 1.0. (3.79)
The W ± next decay into either q m q ′ m pairs or l ± mν m pairs. The branching fractions of the
neutral Higgs h 0 , H 0 and A 0 are given in Table. 3.6 and also in Table. 3.7. Though H 0
is almost never produced through heavy fermion decays in our model, we have included
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