Abstract
We present a model independent closed form expression for |Vub|2/|VtbVts*| 2, which includes the resummation of large endpoint logarithms as well as the interference effects from the operators O2 and O8. We demonstrate that the method to extract |Vub| presented by the authors in hep-ph/9909404, and modified in this Letter to include interference effects, is not just a refinement of the method introduced in hep-ph/9312311. We also discuss the model dependence of the latter proposal. Furthermore, we show that the resummation is not negligible and that the Landau pole does not introduce any significant uncertainties.
Original language | English (US) |
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Pages (from-to) | 83-87 |
Number of pages | 5 |
Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Volume | 513 |
Issue number | 1-2 |
DOIs | |
State | Published - Jul 26 2001 |
Funding
We would like to thank Zoltan Ligeti and Matthias Neubert for useful discussions. This work was supported in part by the Department of Energy under grant number DOE-ER-40682-143 and DE-AC02-76CH03000. A.K.L. would like to thank the theory group at CMU for its hospitality.
ASJC Scopus subject areas
- Nuclear and High Energy Physics