Testing factorization in B→D(*) X decays

C. W. Bauer, B. Grinstein, D. Pirjol, I. W. Stewart

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23 Scopus citations

Abstract

In QCD the amplitude for B̄0→D(*)+ π- factorizes in the large Nc limit or in the large energy limit Q ≫ΛQCD where Q = {mb, m c, mb-mc}. Data also suggest factorization in the exclusive processes B →D*π+ π- π- π0 and B→D*ωπ-; however, by themselves neither a large Nc nor a large Q can account for this. We give exact large Nc relations among isospin amplitudes for B̄→D(*)X and B̄→D(*)X, which can be used to test factorization through exclusive or inclusive measurements. Noting that the condition for large energy release in B̄0→D+ π- is enforced by the small velocity limit, mb≫ mb-mc≫Λ, we propose that the combined large Nc and SV limits justify factorization in B→D(*)X. This combined limit is tested with the B→D*X inclusive decay spectrum measured by CLEO.

Original languageEnglish
Article number014010
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume67
Issue number1
DOIs
StatePublished - 2003

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