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Improved analysis of B → πeν from QCD sum rules on the light-cone.

Ball, P. and Zwicky, R. (2001) 'Improved analysis of B → πeν from QCD sum rules on the light-cone.', Journal of high energy physics., 2001 (10). 019.


We present a new calculation of the Brightarrowpi form-factor f+, relevant for the measurement of |Vub| from semileptonic Brightarrowpi transitions, from QCD sum rules on the light-cone. The new element is the calculation of radiative corrections to next-to-leading twist-3 accuracy. We find that these contributions are factorizable at O(alphas), which lends additional support to the method of QCD sum rules on the light-cone. We obtain f+(0) = 0.26+/-0.06+/-0.05, where the first error accounts for the uncertainty in the input-parameters and the second is a guesstimate of the systematic uncertainty induced by the approximations inherent in the method. We also obtain a simple parametrization of the form-factor which is valid in the entire kinematical range of semileptonic decays and consistent with vector-meson dominance at large momentum-transfer.

Item Type:Article
Keywords:Standard model, Weak decays, B-physics, Sum rules.
Full text:(NA) Not Applicable
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Publisher statement:© 2001 IOP Publishing. This is an author-created, un-copyedited version of an article accepted for publication in Journal of high energy physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.1088/1126-6708/2001/10/019
Record Created:07 May 2008
Last Modified:17 Jun 2015 09:33

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