Abstract
In this work, we study the semileptonic decay modes and in the kinematics region where the system has a invariant mass in the range 0.5–1.3 GeV. These processes are valuable towards the determination of S-wave light-cone distribution amplitudes whose normalizations are scalar form factors. We compare the results for scalar form factors predicted in unitarized chiral perturbation theory and extracted from the data on the . Then the and form factors are calculated in light-cone sum rules, based on which predictions for differential decay widths are made. The results are in good agreement with the experimental data on the and decays into . More accurate measurements at BEPC, LHC and KEKB in the future will be helpful to examine our formalism and constrain the input parameters more precisely.
4 More- Received 30 July 2015
DOI:https://doi.org/10.1103/PhysRevD.92.074038
© 2015 American Physical Society