Measurement of |Vub/Vcb| (and |Vub|) in exclusive nonleptonic decays within the generalized factorization scheme

C. S. Kim, Y. Kwon, Jake Lee, W. Namgung

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21 Citations (Scopus)


Within the generalized factorization scheme, we study extracting |Vub/Vcb| by calculating the ratios B(B° →Ds-++))/(B°-tD-D+) including penguin effects. The ratios involving the B°→D-D+ mode have considerable penguin corrections (-15% at the amplitude level), but those involving the B° →DsD+ mode have relatively small penguin corrections. On the other hand, the B°→D-D+ mode has a smaller form-factor dependence. Therefore, these ratios complement each other in measuring Vub/Vcb,. The theoretical uncertainty from the hadronic form factors in our method is at the level of 20%, which is comparable to the model dependence uncertainty of about 20% in the measurement of | Vub/Vcj| from the exclusive semileptonic B decays. Using the newest upper limit on B->DSπ decay from CLEO, our method sets an upper limit |Vub/Vcb|<0.13 which is very close to the measured values from the semileptonic B decays.

Original languageEnglish
Article number094506
JournalPhysical Review D
Issue number9
Publication statusPublished - 2001

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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