3 papers
hep-ph1997
Quark-hadron duality for mixing
A. A. Penin, A. A. Pivovarov
Long distance contribution to the mixing is taken into account consistently and the corrections to the naive duality result represented by the famous box diagram are…
hep-ph1995
On a subtle point of sum rules calculations: toy model
A. A. Penin, A. A. Pivovarov
We consider a two-point correlator in massless model within the ladder approximation . The spectral density of the correlator is known explicitly and does not contain any res…
hep-ph1995
Extended analysis of the "penguin" part of amplitude
A. A. Penin, A. A. Pivovarov
We make an attempt to clarify the role of the annihilation or "penguin" mode in the description of the decay within the Standard Model. The attention is concentrat…