The B\to D_s^{(*)}\eta^{(\prime)} decays in the perturbative QCD

TL;DR

This paper calculates branching ratios for specific B meson decays into D_s^{(*)} and eta^{(')} using perturbative QCD, finding results consistent with experimental limits and exploring parameter sensitivities.

Contribution

It provides the first pQCD-based calculations of these decay modes under different eta-eta' mixing schemes and addresses the impact of decay constant uncertainties.

Findings

Calculated branching ratios align with experimental upper limits.

Branching ratios vary by about 30% with different decay constant parameters.

Results support the validity of pQCD in describing these decays.

Abstract

In this paper, we calculate the branching ratios for $B^+\to D_s^+\eta, B^+\to D_s^+\eta^{\prime}$, $B^+\to D_s^{*+}\eta$ and $ B^+\to D_s^{*+}\eta^{\prime}$ decays by employing the perturbative QCD (pQCD) factorization approach. Under the two kinds of $\eta-\eta^{\prime}$ mixing schemes, the quark-flavor mixing scheme and the singlet-octet mixing scheme, we find that the calculated branching ratios are consistent with the currently available experimental upper limits. We also considered the so called "$f_{D_s}$ puzzle", by using two groups of parameters about the $D^{(*)}_s$ meson decay constants, that is $f_{D_s}=241$ MeV, $f_{D^*_s}=272$ MeV and $f_{D_s}=274$ MeV, $f_{D^*_s}=312$ MeV, to calculate the branching ratios for the considered decays. We find that the results change $30\%$ by using these two different groups of paramters.