8,087 research outputs found
The Kaon Form Factor in the Light-Cone Quark Model
The electromagnetic form factor of the kaon meson is calculated in the
light-cone formalism of the relativistic constituent quark model. The
calculated form factor is consistent with almost all of the available
experimental data at low energy scale, while other properties of kaon could
also be interrelated in this representation with reasonable parameters.
Predictions of the form factors for the charged and neutral kaons at higher
energy scale are also given, and we find non-zero form factor at due to the mass difference between the strange and down quarks inside .Comment: 12 latex pages, 2 figures, to appear in Eur.Phy.J.
Quasi-two-body decays in the perturbative QCD approach
We study the quasi-two-body decays by employing
the perturbative QCD approach. The two-meson distribution amplitudes
\Phi_{K\pi}^{\text{P-wave}} are adopted to describe the final state
interactions of the kaon-pion pair in the resonance region. The resonance line
shape for the -wave component in the time-like form factor
is parameterized by the relativistic Breit-Wigner function. For
most considered decay modes, the theoretical predictions for their branching
ratios are consistent with currently available experimental measurements within
errors. We also disscuss some ratios of the branching fractions of the
concerned decay processes. More precise data from LHCb and Belle-II are
expected to test our predictions.Comment: 10 pages, 3 figures and 2 tables.To be published in EPJ
- …