Form factors and branching ratios of the FCNC $$B \rightarrow a_1 \ell ^{+}\ell ^{-}$$ B → a 1 ℓ + ℓ - decays

Direct CP Violation , Branching Ratios and Form Factors B → π , B → K in B Decays

The B → π and B → K transitions involved in hadronic B decays are investigated in a phenomenological way through the framework of QCD factorization. By comparing our results with experimental branching ratios from the BELLE, BABAR and CLEO Collaborations for all the B decays including either a pion or a kaon, we propose boundaries for the transition form factors B → π and B → K depending on the...

Se p 20 07 Form factors , branching ratio and forward - backward asymmetry in B → K 1 l + l − decays

We study long-distance effects in rare exclusive semileptonic decays B → K1ll , K1 is the axial vector meson.The form factors, describing the meson transition amplitudes of the effective Hamiltonian, are calculated using Ward identites which are then used to calculate branching ratio and forward-backward asymmetry in these decay modes. The zero of forward-backward asymmetry is of special intere...

Reweighting of the form factors in exclusive B → X l ν l decays

A form factor reweighting technique has been elaborated to permit relatively easy comparisons between different form factor models applied to exclusive B → Xℓν ℓ decays. The software tool developped for this purpose is described. It can be used with any event generator, three of which were used in this work: ISGW2, PHSP and FLATQ2, a new powerful generator. The software tool allows an easy and ...

Branching fraction measurement of B + → ω l + ν decays

Sudakov effects in B → π l ν l form factors

In order to obtain fundamental information about the Standard Model of particle physics from experimental measurements of exclusive hadronic two-body B-decays we have to be able to quantify the non-perturbative QCD effects. Although approaches based on the fac-torization of mass singularities into hadronic distribution amplitudes and form factors provide a rigorous theoretical framework for the...