Vertical bar V(ub)vertical bar from exclusive semileptonic B -> rho decays

We use Omnes representations of the form factors V, A(1) and A(2) for exclusive semileptonic B -> rho decays, and apply them to combine experimental partial branching fraction information with theoretical calculations of the three form factors to extract vertical bar V-ub vertical bar. We find vertical bar V-ub vertical bar = (2.8 +/- 0.2(stat)+/- 0.5(sys)) x 10(-3). where we have conservatively assumed a 20% systematic error to account for the use of the quenched approximation in the lattice QCD calculations of the form factors. This value of vertical bar V-ub vertical bar is slightly lower than the values extracted from exclusive semileptonic B -> pi decays, (3.47 +/- 0.29 +/- 0.03) x 10(…

A critical analysis on deeply bound kaonic states in nuclei and the KEK experiment

We critically discuss the theoretical developments that led to predictions of very deeply bound kaon states and then revise the data of the KEK experiment from where claims for evidence of deeply bound kaon atoms in nuclei were made. We conclude that the peaks seen in the experiment correspond to the absorption of kaons by a pair of nucleons leading to Σp and Λp and leaving the daughter nucleus as a spectator. These conclusions have been reconfirmed by a recent experiment at FINUDA.

Core polarization phenomena in pion-nucleus charge-exchange reactions above the delta resonance.