Speaker
Prof.
Nikolay Achasov
(Sobolev Institute of Mathematics)
Description
Thee mechanisms of light scalar meson production in the
D_s+\to s\bar s e+\nu\to [\sigma(600)+f0(980)] e+\nu\to\pi+\pi-e+\nu decays are compared with the mechanisms of light pseudoscalar meson production in the D_s+\to s\bar s e+\nu\to (\eta/\eta') e+\nu decays. It is shown that the s\bar s\to\sigma(600) transition is negligibly small in comparison with the s\bar s\to f_0(980) one. As for the s\bar s\to f_0(980) transition, its intensity makes near thirty percent from the intensity of the s\bar s\to\eta_s (\eta_s=s\bar s ) transition. The D_s+\to\pi+\pi- e+\nu decays support the previous conclusion about a dominant role of the four-quark components ud\bar u\bar d and sd\bar s\bar d in the \sigma(600) and f0(980) mesons, respectively. The program of the light scalar investigation in the semileptonic decays of the D+(D-), D0(\bar D0) and B+(B-), B0(\bar B0) mesons is discussed.
Primary author
Prof.
Nikolay Achasov
(Sobolev Institute of Mathematics)
