We discuss threshold resummation in radiative and charmless semileptonic B decays. To deal with the large non perturbative effects, we introduce a model for NNLL resummed form factors based on the analytic QCD coupling. By means of this model we can reproduce with good accuracy the experimental data. Finally we briefly present an improved threshold resummed formula to deal with jets initiated by massive quarks as in the case of semileptonic charmed decays.
Threshold resummation in semi-inclusive B decays / G. Ferrera. - (2006). ((Intervento presentato al 4. convegno International Workshop on the CKM Unitarity Triangle, CKM 2006 tenutosi a Nagoya nel 2006.
Threshold resummation in semi-inclusive B decays
G. FerreraPrimo
2006
Abstract
We discuss threshold resummation in radiative and charmless semileptonic B decays. To deal with the large non perturbative effects, we introduce a model for NNLL resummed form factors based on the analytic QCD coupling. By means of this model we can reproduce with good accuracy the experimental data. Finally we briefly present an improved threshold resummed formula to deal with jets initiated by massive quarks as in the case of semileptonic charmed decays.
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