Andrej Liptaj

Rigorous pion electromagnetic form factor behavior in the spacelike region

Precise experimental information on {sigma}{sub tot}(e{sup +}e{sup -}{yields}{pi}{sup +}{pi}{sup -}) is transferred into the spacelike region by taking advantage of the analyticity. As a result, rigorous pion electromagnetic form factor behavior in spacelike region is obtained. The latter is compared with some existing model predictions.

Study of

In the wake of recent measurements of the decays

B_c

B_c^+\to J/\psi D^+_s

decays into charmonia and

and

D

B_c^+\to J/\psi D^{\ast\,+}_s

mesons

performed by the LHCb and ATLAS Collaborations, we recalculate their branching fractions in the framework of the covariant confined quark model. We compare the obtained results with available experimental data, our previous findings and numbers from other approaches.

Decay

Our article is devoted to the study of the rare

B_s\to \phi \ell^+ \ell^-

B_s\to \phi \ell^+\ell^-

in covariant quark model

decay where

Pion scalar form factor and another confirmation of the existence of the f0(500) meson

\ell=\mu,\tau