respectively, where [g.sub.S] is an effective strong coupling constant obtained from strong decays, e.g., [rho] [right arrow] [pi][pi], [K.sup.*] [right arrow] K[pi], and [phi] [right arrow] KK, and is set as [g.sub.S] = 4.5  in this work, [mathematical expression not reproducible] and [mathematical expression not reproducible] are the mass and decay constant of the pole resonant pseudoscalar meson
[P.sup.*], respectively, [[chi].sup.A.sub.q] and [[phi].sup.A.sub.q] and are the strengths and the strong phases of the corresponding amplitudes.
In the first relation, [p.sup.[mu]] is meson momentum and |p> is pseudoscalar meson
Schechter, "Unitarized pseudoscalar meson
scattering amplitudes from three flavor linear sigma models," Physical Review D: Particles, Fields, Gravitation and Cosmology, vol.
Chen, "Application of the light-front holographic wavefunction for heavy-light pseudoscalar meson
in [B.sub.d,s] [right arrow] [D.sub.d,s] P decays," Nuclear Physics B, vol.
where [[lambda].sub.+(-)] is the residue of the positive (negative) parity baryon and [g.sub.ij] is the coupling constant of the pseudoscalar meson
with heavy baryon.
We consider only normal and strange matter, that is, the baryons and mesons constituted by u, d and s quarks: the baryon octet (spin 1/2 baryons), the baryon decouplet (spin 3/2 baryons), the pseudoscalar meson
nonet (spin 0 mesons), and the vector meson nonet (spin 1 mesons), which leaves us with a total of 54 particles (18 baryons, 18 antibaryons, and 18 mesons).
Actually, for each observed V [right arrow] P[gamma] decay (V and P being a vector and a pseudoscalar meson
, resp.), there could be a V [right arrow] P[gamma]' process, suppressed by a factor [[epsilon].sup.2] with respect to the former one .
Simula, "Decay constants of heavy pseudoscalar mesons
from QCD sum rules," Journal of Physics G: Nuclear and Particle Physics, vol.
In this paper, we have presented one class of such type of pure leptonic and semileptonic decays of pseudoscalar mesons
involving di-neutrinos in their final state in the framework of SM and R-parity violating ([[??].sub.p]) supersymmetric (SUSY) model.
The fitted value of [kappa] = 0.59 GeV for pseudoscalar mesons
, and [kappa] = 0.54 GeV for vector mesons.
For convenience, we use the covariant form of [mathematical expression not reproducible] for pseudoscalar mesons
which is given by
Aksit, "Investigation of heavy-heavy pseudoscalar mesons
in thermal QCD sum rules," Journal of Physics G, vol.