Subleading shape functions in B ---> X(u) lepton anti-nu and the determination of |V(ub)|
May, 20026 pages
Published in:
- Phys.Lett.B 543 (2002) 261-268
e-Print:
- hep-ph/0205150 [hep-ph]
Report number:
- UCSD-PTH-02-12
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Abstract:
We calculate the subleading twist contributions to the endpoint of the inclusive lepton energy spectrum in B -> X_u l \nu. We show that the same two subleading twist functions that appear in the decay B -> X_s \gamma govern the subleading effects in this decay. Using these results we find large O(Lambda/mB) corrections to the determination of |Vub| from the endpoint of the charged lepton spectrum. Using a simple model for the relevant subleading shape functions, we estimate the uncertainty in |Vub| from Lambda/mb corrections to be at the ~ 15% level for a lower lepton energy cut of 2.2 GeV.Note:
- 6 pages, 2 figures Report-no: UCSD/PTH 02-12
- B: semileptonic decay
- decay: inclusive reaction
- up
- lepton: energy spectrum
- effect: higher-twist
- B: radiative decay
- quantum chromodynamics: Lambda parameter
- B: mass
- CKM matrix matrix
- B: structure function
References(22)
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