https://doi.org/10.1140/epjc/s10052-017-5198-6
Regular Article - Theoretical Physics
Charged-Higgs on 
, 
polarization, and FBA
1
Department of Physics, National Cheng-Kung University, Tainan, 70101, Taiwan
2
School of Physics, KIAS, Seoul, 130-722, Korea
* e-mail: nomura@kias.re.kr
Received:
1
June
2017
Accepted:
5
September
2017
Published online:
21
September
2017
We study the influence of a charged-Higgs on the excess of branching fraction ratio, 
, in a generic two-Higgs-doublet model. In order to investigate the lepton polarization, the detailed decay amplitudes with lepton helicity are given. When the charged-Higgs is used to resolve excesses, it is found that two independent Yukawa couplings are needed to explain the 
and 
anomalies. We show that when the upper limit of 
is included, can be significantly enhanced while 
. With the 
constraint, we find that the -lepton polarizations can be still affected by the charged-Higgs effects, where the standard model (SM) predictions are obtained: 
and 
, and they can be enhanced to be 
and 
by the charged-Higgs. The integrated lepton forward–backward asymmetry (FBA) is also studied, where the SM result is 
, and they can be enhanced (decreased) to be 
.
© The Author(s), 2017
