Analysis of Forward-Backward and Lepton Polarization Asymmetries in $B\to K_{1}\ell^{+}\ell^{-}$ Decays in the Two-Higgs-doublet Model

Abstract

The exclusive semileptonic $B\to K_{1}(1270) \ell^{+}\ell^{-}$ ($\ell=\mu , \tau$) decays are analyzed in variants of two Higgs double models (THDMs). The mass eigenstates $K_{1}(1270)$ and $K_{1}(1400)$ are the mixture of two axial-vector SU(3) $^{1}{P}_{1}$ and $^{3}{P}_{1}$ states with the mixing angle $\theta_{K}$. Making use of the form factors calculated in the Light Cone QCD approach and by taking the mixing angle $\theta_{K}=-34^{\circ}$, the impact of the parameters of the THDMs on different asymmetries in above mentioned semileptonic $B$ meson decays are studied. In this context the forward-backward asymmetry and different lepton polarization asymmetries have been analyzed. We have found comprehensive effects of the parameters of the THDMs on the above mentioned asymmetries. Therefore, the precise measurements of these asymmetries at the LHC and different $B$ factories, for the above mentioned processes, can serve as a good tool to put some indirect constraints on the parametric space of the different versions of THDM.Comment: 25 pages, 10 figures, Accepted for Publication in PTEP. arXiv admin note: text overlap with arXiv:0804.0648 by other author