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The non-decoupling effects of heavy Higgs bosons as well as fermions on theloop-induced $H^\pm W^\mp Z^0$ vertex are discussed in the general two Higgsdoublet model. The decay width of the process $H^+ \to W^+ Z^0$ is calculatedat one-loop level and the possibility of its enhancement is explored bothanalytically and numerically. We find that the novel enhancement of the decaywidth can be realized by the Higgs non-decoupling effects with largemass-splitting between the charged Higgs boson and the CP-odd one. This is dueto the large breakdown of the custodial $SU(2)_V$ invariance in the Higgssector. The branching ratio can amount to $10^{-2} \sim 10^{-1}$ for $m_{H^\pm}= 300$ GeV within the constraint from the present experimental data. Hence thismode may be detectable at LHC or future $e^+e^-$ linear colliders.Comment: 31+1 pages, Latex with 8 eps-file

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Enhancement of the loop-induced<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>H</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>W</mml:mi></mml:mrow><mml:mrow><mml:mo>∓</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>vertex in the two-Higgs…

Enhancement of the loop-inducedH±W∓Z0vertex in the two-Higgs…