348 research outputs found
B-> K photon photon via intermediate eta'
We examine our previous conjecture that the eta' intermediate resonance has
the dominant role in the long distance contributions to B decay into two
photons and a strange final state hadron. We calculate the branching ratio of
the exclusive B-> K eta'-> K photon photon decay using the nonspectator
mechanism for eta' production in charmless hadronic B decays. It is shown that
the obtained branching ratio B^eta'(B-> K\gamma\gamma)~ 8.7 X 10^{-7} is more
than twice as large as the eta_c contribution to this decay mode.Comment: 6 pages, latex, no figure
Dynamical spin effects in the pion
We take into account dynamical spin effects in the holographic light-front
pion wavefunction in order to predict the pion radius, decay constant, the pion
electromagnetic and photon-to-pion transition form factors. We report a
striking improvement in the description of all data.Comment: 4 pages, 2 figures. Proceedings Contribution for the 9th
International Workshop on Diffraction in High Energy Physics (Diffraction
2016), Santa Tecla di Acireale, Catania, Italy, September 2-8, 201
Spectator Effects in the Decay B -> K \gamma \gamma
We report the results of the first computation related to the study of the
spectator effects in the rare decay mode within the
framework of Standard Model. It is found that the account of these effects
results in the enhancement factor for the short-distance reducible contribution
to the branching ratio.Comment: 5 pages, 5 figures, RevTeX
Pade-Improved Estimate of Perturbative Contributions to Inclusive Semileptonic Decays
Pade-approximant methods are used to estimate the three-loop perturbative
contributions to the inclusive semileptonic decay rate. These
improved estimates of the decay rate reduce the theoretical uncertainty in the
extraction of the CKM matrix element from the measured inclusive
semileptonic branching ratio.Comment: 3 pages, latex, write-up of talk presented at DPF 200
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