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arXiv · 1811.12738

Isovector scalar $a_0(980)$ and $a_0(1450)$ resonances in the $B\rightarrow \psi (K\bar{K},\pi\eta) $ decays

Zhou Rui·Ya-Qian Li·Jie Zhang
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Abstract

We present an analysis of two isovector scalar resonant contributions to the $B$ decays into charmonia plus $K\bar K$ or $\pi\eta$ pair in the perturbative QCD approach. The Flatt\'{e} model for the $a_0(980)$ resonance and the Breit Wigner formula for the $a_0(1450)$ resonance are adopted to parametrize the timelike form factors in the dimeson distribution amplitudes, which capture the important final state interactions in these processes. The predicted distribution in the $K^+K^-$ invariant mass as well as its integrated branching ratio for the $a_0(980)$ resonance in the $B^0\rightarrow J/\psi K^+K^-$ mode agree well with the current available experimental data. The obtained branching ratio of the quasi-two-body decay $B^0\rightarrow J/\psi a_0(980)(\rightarrow \pi^0\eta)$ can reach the order of $10^{-6}$, letting the corresponding measurement appear feasible. For the $a_0(1450)$ component, our results could be tested by further experiments in the LHCb and Belle II. We also discuss some theoretical uncertainties in detail in our calculation.

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Zhou Rui, Ya-Qian Li, Jie Zhang. 2018-11-30. Isovector scalar $a_0(980)$ and $a_0(1450)$ resonances in the $B\rightarrow \psi (K\bar{K},\pi\eta) $ decays. https://doi.org/10.1103/physrevd.99.093007

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