Abstract
We demonstrate that dispersion theory allows one to deduce crucial information on πη scattering from the final-state interactions of the light mesons visible in the spectral distributions of the decays \( {\overline{B}}_d^0\to J/\psi \left({\pi}^0\eta, {K}^{+}{K}^{-},{K}^0{\overline{K}}^0\right) \). Thus high-quality measurements of these differential observables are highly desired. The corresponding rates are predicted to be of the same order of magnitude as those for \( {\overline{B}}_d^0\to J/\psi {\pi}^{+}{\pi}^{-} \) measured recently at LHCb, letting the corresponding measurement appear feasible.
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Albaladejo, M., Daub, J.T., Hanhart, C. et al. How to employ \( {\overline{B}}_d^0\to J/\psi \left(\uppi \eta, \overline{K}K\right) \) decays to extract information on πη scattering. J. High Energ. Phys. 2017, 10 (2017). https://doi.org/10.1007/JHEP04(2017)010
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DOI: https://doi.org/10.1007/JHEP04(2017)010