Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-05-15
Nucl.Phys.B389:534-548,1993
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, report NSF-92-76, TPI-MINN-92/22-T
Scientific paper
10.1016/0550-3213(93)90330-R
We discuss nonfactorizable $1/N_c$ contributions in the amplitudes of non-leptonic exclusive decays of the type $B\rightarrow D\pi$ ($N_c$ is the number of colors). In a certain kinematical limit rather reliable estimates are possible. It is demonstrated that the nonfactorizable parts are of the same order as the factorizable $1/N_c$ parts of the ampiltudes, and have the opposite sign. Thus, an approximate rule of discarding $1/N_c$ corrections in the nonleptonic exclusive decays emerges dynamically. It is shown that this rule is not exact and the degree of compensation is different in different channels. Our predictions make use of the fact that a key matrix element that measures deviations from factorization can be determined using the heavy quark effective theory.
Blok Boris
Shifman Michael
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