Exclusive Semileptonic b->u l nu Decays at CLEO

Details Exclusive Semileptonic b->u l nu Decays at CLEO Exclusive Semileptonic b->u l nu Decays at CLEO

2007-02-23

arxiv.org/abs/hep-ex/0702036v1

Physics

High Energy Physics

High Energy Physics - Experiment

Presented at 4th Int. Workshop on the CKM Triangle, Nagoya, Japan, Dec. 2006, to appear in the proceedings; 3 pages, 6 figures

Scientific paper

Updated CLEO results are presented for branching ratios and four-momentum transfer q^2 dependence of exclusive charmless semileptonic B decays, where the final state hadron is either a pi, rho, omega, eta or eta'. These results have comparable accuracies with those of other experiments. We address the issue of flavor singlet couplings by limiting Gamma(B+ -> eta' l+ nu)/\Gamma(B+ -> eta l+ nu)> 2.5 at 90 % CL}. We also extract a value of |V_{ub}|= (4.3 +/- 0.4 +/-0.2^{+0.6}_{-0.4})x10^{-3} in one particular unquenched lattice QCD model using pi l+nu data above q^2 of 16 GeV^2.

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