Rosner, J. L. and Weinstein, A. J. (2006) Experimental Limits on Weak Annihilation Contributions to b → ulv Decays. Physical Review Letters, 96 (12). Art. No. 121801. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20110729-102252420
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We present the first experimental limits on high-q^2 contributions to charmless semileptonic B decays of the form expected from the weak annihilation (WA) decay mechanism. Such contributions could bias determinations of |V_(ub)| from inclusive measurements of B→X_ulν. Using a wide range of models based on available theoretical input we set a limit of Γ_(WA)/Γ_(b→u) <7.4% (90% confidence level) on the WA fraction, and assess the impact on previous inclusive determinations of |V_(ub)|.
|Additional Information:||© 2006 The American Physical Society. Received 10 January 2006; published 28 March 2006. We gratefully acknowledge the effort of the CESR staff in providing us with excellent luminosity and running conditions. We thank G. Paz, Z. Ligeti, M. Luke, and M. Neubert for helpful discussions. This work was supported by the A. P. Sloan Foundation, the National Science Foundation, and the U.S. Department of Energy.|
|Classification Code:||PACS: 13.20.He, 12.15.Hh, 12.15.Ji|
|Official Citation:||Experimental Limits on Weak Annihilation Contributions to b→ulν Decays J. L. Rosner et al. (CLEO Collaboration) Published 28 March 2006 (5 pages) 121801|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||01 Aug 2011 14:51|
|Last Modified:||26 Dec 2012 13:25|
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