The Cherenkov Telescope Array (CTA) is a new observatory for very high-energy (VHE) gamma rays. CTA has ambitions science goals, for which it is necessary to achieve full-sky coverage, to improve the sensitivity by about an order of magnitude, to span about four decades of energy, from a few tens of GeV to above 100 TeV with enhanced angular and energy resolutions over existing VHE gamma-ray observatories. An international collaboration has formed with more than 1000 members from 27 countries in Europe, Asia, Africa and North and South America. In 2010 the CTA Consortium completed a Design Study and started a three-year Preparatory Phase which leads to production readiness of CTA in 2014. In this paper we introduce the science goals and the concept of CTA, and provide an overview of the project. ?? 2013 Elsevier B.V. All rights reserved

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CLEO has studied B decays to the nal states ` , ` , and !` , wherè = e or. We fully reconstruct these modes using a measurement of the missing energy and momentum in each event to infer the neutrino momentum. With the B 0 and B + modes combined according to isospin predictions for the relative partial widths, we obtain B(B 0 ! ?`+) = (1:8 0:4 0:3 0:2) 10 ?4 and B(B 0 ! ?`+) = (2:5 0:4 +0:5 ?0:7 0:5) 10 ?4 , where the errors are statistical, systematic and the estimated model-dependence. We also estimate jV ub j = (3:3 0:2 +0:3 ?0:4 0:7) 10 ?3 .

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