M. Naeem Shahid

Chiral Nonet Mixing in pi pi Scattering

The underlying mixing of quark components of scalar mesons is probed in

Semi-leptonic

\pi K

D_s^+

scattering within a generalized linear sigma model that contains two scalar meson nonets and two pseudoscalar meson nonets (a quark-antiquark and a four-quark). In the leading order of this model, all free parameters have been previously fixed using the mass spectra and several low-energy parameters known from experiment and consistent predictions have been made. As other predictions of the model, in the present work the isospins

(1968) decays as a scalar meson probe

I

Naturally perturbed S

= 1/2, 3/2 and

_3

J

neutrinos

=0 projection of

Remark on pion scattering lengths

\pi K

Note about the implementation of finite symmetries in the lepton sector

scattering amplitude (as well as phase shifts) are computed and compared with experiment. In the

NOTE ABOUT LEPTON MASSES AND MIXINGS IN TWO ANSATZE

I