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In the Standard Model (SM) the photon in radiative ¯ B 0 and ¯ B s decays is predominantly left-handed. Thus, mixing induced CP asymmetries in b → sγ and b → dγ are suppressed by m s /m b and m d /m b , respectively, and are very small. In many extensions of the SM, such as the left-right symmetric model (LRSM), SU(2) × U(1) models with exotic fermions and(More)
We show that it is possible to construct ǫ ′ /ǫ to NLO using partially quenched chiral perturbation theory (PQChPT) from amplitudes that are computable on the lattice. We demonstrate that none of the needed amplitudes require three-momentum on the lattice for either the full theory or the partially quenched theory; non-degenerate quark masses suffice.(More)
We report on our calculation of K → π vector form factor by numerical simulations of two-flavor QCD on a 16 3 × 32 × 12 lattice at a 0.12 fm using domain-wall quarks and DBW2 glue. Our preliminary result at a single sea quark mass correponding to m PS /m V 0.53 shows a good agreement with previous estimate in quenched QCD and that from a phenomenological(More)
We consider the production of gravitons via two photon and electron-photon fusion in Kaluza-Klein theories which allow TeV scale gravitational interactions. We show that at electron-positron colliders, the processes ℓ + ℓ − → ℓ + ℓ − + graviton, with ℓ = e, µ, can lead to a new signal of low energy gravity of the form ℓ + ℓ − → ℓ + ℓ − + missing energy(More)
We consider several hints for new physics involving CP-asymmetries in B-decays and interpret them in terms of generic contributions to effective Wilson coefficients. The effects we focus on are: the differences in the fitted value of sin 2β versus the ones directly measured via the time dependent CP asymmetries in B → J/ψK or via B → (φ, η ′)K; the(More)
We consider the strong rescattering effects that can occur in the decays such as B → Kπ, K * π, Kρ. .. and their impact on direct CP violation in these modes. First we discuss, in general, how the CPT theorem constrains the resulting pattern of partial rate asymmetries leading to different brands of direct CP. Traditional discussions have centered around(More)
The potential of a Super Flavor Factory (SFF) for searches of New Physics is reviewed. While very high luminosity B physics is assumed to be at the core of the program, its scope for extensive charm and τ studies are also emphasized. The possibility to run at the Υ(5S) as well as at the Υ(4S) is also very briefly discussed; in principle, this could provide(More)