Published in:
Physical Review Letters 96,12 (2006) 121801;
Link to original published article:
http://link.aps.org/doi/10.1103/PhysRevLett.96.121801
Abstract
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 vertical bar V(ub)vertical bar from inclusive measurements of B -> X(u)l nu. Using a wide range of models based on available theoretical input we set a limit of Gamma(WA)/Gamma(b -> u)< 7.4% (90% confidence level) on the WA fraction, and assess the impact on previous inclusive determinations of vertical bar V(ub)vertical bar.
Keywords
semileptonic b-decays;; ub-vertical-bar;; mass-spectrum;; factorization;; parameters;; detector;; hadrons;; model
Date of this Version
January 2006