Speaker
Mr
George Yabusaki
(UNICSUL)
Description
The study of the lightest pseudoscalar mesons plays an important role in order to understand the low energy QCD,being
the lightest strongly bound quark-antiquark states as well as the
Goldstone bosons associated with chiral symmetry
breaking. Their static and dynamical properties have also been investigated theoretically and experimentally.
With respect to the description
of bound states on the light cone, a detailed review of hadronic wave functions in QCD models can be found.
Additional important knowledge about the meson's internal structure can be inferred from their
valence-quark parton distribution functions. The theoretical framework we adopt is the light-front
field theory formalism, more specifically, we here ameliorate the
light-front approach, where two classes of quark-antiquark bound-state
models for the Bethe-Salpeter amplitude of the K meson must be distinguished:
the nonsymmetric and the symmetric vertex model.
The light-front component $J^+$ of the electromagnetic current has been successfully
used to calculate elastic form factors.
For the symmetric vertex model, the components of the current are
conveniently obtained in the Drell-Yan
frame, where that on the light-cone the bound state wavefunctions are defined
on the hypersurface $x^0+x^3 = 0$
and are covariant under kinematical boosts due to the stability of
Fock-state decomposition.
In this work, we consider the symmetrical quark-antoquark bound-state vertex function with the intention
to optimize and unify the parameter set which simultaneously reproduces
the K meson decay constants,
charge radii and their electromagnetic form factors, for the latter, our
numerical results are compared with experimental
data up to $10~GeV^2$ in order to explore the validity of the model at large $q^2$ transfer.
Author
Mr
George Yabusaki
(UNICSUL)
Co-authors
Dr
Ali Paracha
(National University of Science and Technology)
Prof.
Bruno El-Bennich
(UNICSUL)
Dr
Ishtiaq Ahmed
(Quaid-I-Azam University)
Prof.
Joao Pacheco Bicudo Cabral de Melo
(UNICSUL)
