On the inclusive determination of |V(ub)| from the lepton invariant mass spectrum
Jun, 200019 pages
Published in:
- JHEP 07 (2000) 022
e-Print:
- hep-ph/0006068 [hep-ph]
Report number:
- CLNS-00-1676
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Abstract: (arXiv)
Bauer, Ligeti and Luke have recently proposed a new method for measuring |V_{ub}| in inclusive semileptonic B decays, using a cut on the lepton invariant mass to discriminate against b->c transitions. We investigate the structure of the heavy-quark expansion for this case and show that to all orders the magnitude of the leading perturbative and nonperturbative corrections is controlled by a hadronic scale mu_c=O(m_c) depending on the minimal value of q^2. These corrections can be analyzed using a modified version of the heavy-quark expansion (``hybrid expansion''). We find that the theoretical uncertainty in the extraction of |V_{ub}| is a factor 2.5 larger than previously estimated, which allows for a determination with 10% accuracy.Note:
- 19 pages, 8 figures
- B: semileptonic decay
- decay: inclusive reaction
- CKM matrix matrix
- mass spectrum
- heavy quark
- quark: mass
- correction: higher-order
- HQET model
- renormalization group
- tensor: hadronic
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