# $S$-wave resonance contributions to the $B^0_{(s)}\to \eta_c{(2S)}\pi^+\pi^-$ in the perturbative QCD factorization approach

## TL;DR

This paper uses perturbative QCD to analyze $B^0_{(s)}$ decays involving $S$-wave resonances in the two-pion system, providing predictions for decay rates with different resonance models.

## Contribution

It introduces a detailed PQCD analysis of $B^0_{(s)}$ decays with $S$-wave resonance contributions, comparing different scalar form factor models.

## Key findings

- Predicted branching ratio for $B^0_s$ decay: approximately 2.67×10^{-5}.
- Predicted branching ratio for $B^0$ decay with $f_0(500)$: around 1.4×10^{-6}.
- Results vary depending on the resonance model used.

## Abstract

By employing the perturbative QCD (PQCD) factorization approach, we study the quasi-two-body $B^0_{(s)}\to \eta_c{(2S)}\pi^+\pi^-$ decays, where the pion pair comes from the $S$-wave resonance $f_0(X)$. The Breit$-$Wigner formula for the $f_0(500)$ and $f_0(1500)$ resonances, and the Flatt\'e model for the $f_0(980)$ resonance are adopted to parameterize the time-like scalar form factors in the two-pion distribution amplitudes. As a comparison, Bugg's model is also used for the wide $f_0(500)$ in this work. For decay rates, we found the following PQCD predictions: (a) $ {\cal B}(B^0_s\to \eta_c(2S) f_0(X)[\pi^+\pi^-]_s )=\left ( 2.67^{+1.78}_{-1.08} \right )\times 10^{-5}$ when the contributions from $f_0(980)$ and $f_0(1500)$ are all taken into account; (b) ${\cal B}(B^0\to \eta_c(2S) f_0(500)[\pi^+\pi^-]_s)= \left ( 1.40 ^{+0.92}_{-0.56} \right ) \times 10^{-6}$ in the Breit-Wigner model and $ \left ( 1.53 ^{+0.97}_{-0.61} \right ) \times 10^{-6}$ in the Bugg's model.