Abstract
The [Formula: see text] weak decay is studied with the perturbative QCD approach firstly. It is found that (1) main contributions to branching ratio come from the longitudinal and parallel helicity amplitudes, (2) branching ratio, longitudinal and parallel polarization fractions are sensitive to the wave functions of the [Formula: see text] meson, (3) branching ratio for the [Formula: see text] decay can reach up to [Formula: see text], which might be promisingly measured by the future experiments.
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