$$B_d (\bar B_d )$$ → ρ ± π ∓,ρ + ρ −,π + π −: Hunting for alpha

THE SEMILEPTONIC DECAYS D → π(ρ)eν AND B → π(ρ)eν FROM QCD SUM RULES

We investigate the semileptonic decays of B and D mesons into π and ρ mesons, respectively, by means of QCD sum rules. We find that for the vector formfactors involved the pole dominance hypothesis is valid to good accuracy with pole masses in the expected range. Pole dominance, however, does not apply to the axial formfactors which results in specific predictions for the predominant polarizati...

Direct CP Violation in B ± → ρ ± π + π − in the ρ 0 - ω Interference Region 1

π+π− Emission from Coherent ρ Propagation in Nuclei

Cross sections for the π+π− events arising due to the decay of ρ0 meson have been calculated. This rho meson is considered to produce coherently in the (p, p′) reaction on a nucleus. The distorted wave functions for the continuum particles and the rho meson propagator are described by the eikonal form. The sensitivity of the cross section on the pion emission angle as well as on the beam energy...

Obtaining α from B → ρ ± π ∓∗

We discuss how to extract the weak phase α from present data on B → ρ ± π ∓ decays. Introducing α eff and constraining the difference from α using flavor SU(3), one arrives at α = (95 ± 16) • , if a testable assumption of a small relative strong phase between the two relevant tree amplitudes is employed to distinguish between discrete ambiguities. On the long run we advocate the combined fit to...

Solving the ρ–π puzzle by higher charmonium Fock states

A new explanation for the longstanding puzzle of the tiny branching fraction of ψ → ρπ relative to that for J/ψ → ρπ was proposed. In the case of J/ψ, we argue that this decay is dominated by a higher Fock state in which the cc̄ pair is in a color-octet S1 state and annihilates via the process cc̄ → qq̄. In the case of the ψ, we argue that the probability for the cc̄ pair in this higher Fock state ...