We derive model independent lower bounds on the CKM parameters (1− ρ̄) and η̄ as functions of the mixing-induced CP asymmetry S in B → ππ and sin 2β fromB → ψKS. The bounds do not depend on specific results of theoretical calculations for the penguin contribution to B → ππ. They require only the very conservative condition that a hadronic phase, which vanishes in the heavy-quark limit, does not e...

We extend the quark Born diagram formalism for hadron-hadron scattering to processes with valence q ¯ q annihilation, specifically I = 0 and I = 1 ππ and I = 1/2 Kπ elastic scattering. This involves the s-channel hybrid annihilation process q 2 ¯ q 2 → q ¯ qg → q 2 ¯ q 2 and conventional s-channel q ¯ q resonances, in addition to the t-channel gluon exchange treated previously using this formal...

The formalism of Dalitz-plot analysis is reviewed in the preceding note. Recent studies of multi-body decays of charm mesons probe a variety of physics, including γ/φ 3 , D 0 –D 0 mixing, searches for CP violation, doubly Cabibbo-suppressed decays, and properties of S-wave ππ, Kπ, and K ¯ K resonances. In the following, we discuss: (1) D 0 → K 0 S π + π − ; (2) doubly Cabibbo-suppressed decays;...

We present the results of quantum chemical calculations of the electronic properties of the anionic form of the green fluorescent protein chromophore in the gas phase. The vertical detachment energy of the chromophore is found to be 2.4-2.5 eV, which is below the strongly absorbing ππ* state at 2.6 eV. The vertical excitation of the lowest triplet state is around 1.9 eV, which is below the phot...

The t-channel contribution to the difference of electromagnetic polarizabilities of the nucleon, (α−β)t, can be quantitatively understood in terms of a σ-meson pole in the complex t-plane of the invariant scattering amplitude A1(s, t) with properties of the σ meson as given by the quark-level Nambu–Jona-Lasinio model (NJL). Equivalently, this quantity may be understood in terms of a cut in the ...