منابع مشابه
Regge asymptotics and color suppressed heavy meson decays
We discuss a possible generation of color suppressed B-decays amplitudes through a soft final state interaction. As a typical example, we consider in detail the decay B̄ → Dπ (and also B̄ → 2π). We show that in the approximation of the two particle unitarity and at zero order in αs this process can be related to the weak decay B̄ → Dπ followed by the strong charge exchange scattering in the Regge ...
متن کاملFactorization in Color - Suppressed B Meson Decays ∗
We summerize the status of factorization hypothesis in the color-suppressed B meson decays : B → J/ψK (*). We present the general formalism for decay rates and polarization fractions with considering all possible non-factorizable contributions which also include the color-octet contributions, and a new factorization scheme comes appear when the universality is exist : χ F 1 = χ A1 = χ A2 = χ V ...
متن کاملSoft gluon suppression of 1/Nc contributions in color suppressed heavy meson decays
We discuss the non-factorizable terms in color suppressed (Class II) decays. Our emphasis is on the non-perturbative soft gluon exchange mechanism, which has been previously found to be responsible for the rule of dicarding 1/Nc in the Class I decays. The non-factorizable contribution to the decay B̄ → Dπ at the tree level is estimated within the light cone QCD sum rule method which combines the...
متن کاملAsymptotics of heavy-meson form factors
Using methods developed for hard exclusive QCD processes, we calculate the asymptotic behaviour of heavy-meson form factors at large recoil. It is determined by the leadingand subleading-twist meson wave functions. For 1 ≪ |v · v′| ≪ mQ/Λ, the form factors are dominated by the Isgur–Wise function, which is determined by the interference between the wave functions of leading and subleading twist...
متن کاملComments on Color-Suppressed Hadronic B Decays
Recent experimental results on the color-suppressed nonleptonic decays B̄0 → D(∗)0π0 provide evidence for a failure of the naive factorization model and for sizeable relative strong-interaction phases between class-1 and class-2 B̄ → D(∗)π decay amplitudes. The allowed regions for the corresponding ratios of (complex) isospin amplitudes and a2/a1 parameters are determined. The results are interpr...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1996
ISSN: 0370-2693
DOI: 10.1016/0370-2693(96)00883-0