The large ratio of color-suppressed tree amplitude to color-allowed one in B → ππ decays is difficult to understand within the Standard Model, which is known as the “B → ππ puzzle”. The two tree diagrams contain the upand charm-quark component of penguin amplitude, Puc, which cannot be separated by measuring B → ππ decays alone. We show that the measurements of the branching ratio and direct CP...

Both B factories BELLE 1 and BABAR 2 have reported at this conference the preliminary results of B → Kπ and B → ππ (see Table I). For the unitary angle γ ∼ 60, the ratio R = B(B → Kπ)/B(B → ππ) is conventionally predicted to lie in the region 1.3−2.0, to be compared with the experimental values of 4.0± 1.6, 2.8± 2.0 and 1.3± 0.5 obtained by CLEO , BELLE and BABAR, respectively. Hence, the expec...

CERN measurements of πp → ππn on polarized target at 17.2 GeV/c enable experimental determination of partial wave production amplitudes below 1080 MeV. The measured S-wave transversity amplitudes provide evidence for a narrow scalar resonance σ(770). The assumption of analyticity of production amplitudes in dipion mass allows to determine S-wave helicity amplitudes S0 and S1. The helicity flip ...

The molecular mechanism for removing the excess energy in DNA bases is responsible for the high photostability of DNA and is thus the subject of intense theoretical/computational investigation. To understand why the excited state decay of the stacked bases is significantly longer than that of the monomers, we carried out electronic structure calculations on an adenine monomer and an aqueous (dA...

Two sources of strong phases in the decays B to ππ are identified: (1) “quasi-elastic scattering” corresponding to intermediate states like ππ and ρρ, (2) “cc̄” corresponding to intermediate states like DD̄ and D∗D̄∗. Possibilities of using data to identify these two sources are discussed and illustrated. Present data suggests both sources may be significant. The decay of B → ππ may be considered ...

π + π − e ± ν (Ke4) decay. Thanks to the absence of other hadrons in the final state the ππ interaction can be analyzed in terms of phase shift variation with the ππ invariant mass. The preliminary results on a set of ∼ 1150000 K events collected in two years of data taking, will be discussed. The second way to evaluate the ππ scattering lengths is based on the accurate study of K → πππ Dalitz ...

The study of radiative φ decays into scalar mesons, with subsequent decay into ππγ, constitutes an important topic at the electron-positron collider DAPHNE. The interference of the respective amplitude with the one for ππγ production, where the photon originates from initial state radiation, will allow for unambiguous tests of models for the φ → γf0(→ ππ) amplitude. The forward-backward asymmet...