The amplitudes for one-pion mediated transitions between heavy meson excited states are obtained in the framework of the relativistic chiral quark model. The effective coupling constants to pions and the decay widths of excited heavy mesons with l ≤ 2 for non-radially excited, and the l = 0 radially excited mesons are presented for both charmed and beauty mesons. We also discuss the allowed dec...

In [1] the light scalar meson nonet has been considered within the QCD sum rules approach with the interpolating current consisting of the scalar diquark and the scalar antidiquark. It has been shown that the negative contributions from the operators of dimension 8 are dominant in the sum rules, so that, there is no evidence of the coupling of the above tetraquark current with the light scalar ...

I. Introduction 575 1. The decay K° — • TT + W~. Basic experimental results 575 2. Attempts to explain the decay Kjj —-K*W~ without violation of CP invariance 576 3. The purpose of this article 577 4. The hypothesis of CPT invariance 577 5. A new interaction 578 6. The a particles 579 7. Summary of processes 579 n. Neutral K mesons 581 8. Description of K° mesons 581 9. The decays K^ — w*ir~ an...

We propose a modification of the mechanism of charmed quarks fragmentation into D mesons in hadronic collisions. It is shown that the distinction in valence quark distributions in the initial π ± and K ± mesons leads to different inclusive spectra of D and D s mesons produced in π ± and K ± beams.