Penguin diagrams for decays such as b → (s, d)γ involve virtual loops of u or other light quarks. Logarithms of the virtual quark mass could, in principle, influence the phenomenological analysis of… (More)

We present a model for next-to-leading order resummed threshold form factors based on a time-like coupling. Since the latter acts as a regulator for Landau-pole singularities, our form factors are… (More)

Abstract: In this work we give a detailed description of a method for the calculation of QCD corrections to electroweak processes in dimensional regularization that does not require any definition of… (More)

We present an approximate NNLO evaluation of the QCD form factor resumming large logarithmic pertur-bative contributions in semi-inclusive heavy flavour decays.

We compute the QCD form factor resumming threshold logarithms in B → Xc + l+νl decays to next-to-leading logarithmic approximation. We present an interpolation formula including soft as well as… (More)

We consider the decay of a heavy flavour into an inclusive hadronic state X of invariant mass mX small with respect to its energy EX , mX ≪ EX . The electron spectrum and the hadronic mass… (More)

X iv :0 80 9. 48 60 v1 [ he pex ] 2 8 Se p 20 08 |Vub| extraction using the Analytic Coupling model U. Aglietti, F. Di Lodovico G. Ferrera, G. Ricciardi. a Dip. Fis., Univ. di Roma I “La Sapienza” &… (More)

We present a model for next-to-leading order resummed threshold form factors based on a time-like coupling recently introduced in the framework of small x physics. Improved expressions for the form… (More)

We compute the leading one-loop corrections to the shape function f(k+) with a hard cut-off regularization. The matching constant onto full QCD is infrared safe, i.e. the leading infrared singularity… (More)

We review semi-inclusive charmless B decays, focussing on threshold logarithmic resumming and on univer-sality of QCD dynamics in radiative and semileptonic decays.