Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-04-05
Phys.Rev.Lett.103:171801,2009
Physics
High Energy Physics
High Energy Physics - Experiment
12 pages, 3 figures, submitted to PRL
Scientific paper
10.1103/PhysRevLett.103.171801
We study B->K(*)l+l- decays (l=e,mu) based on a data sample of 657 million BB pairs collected with the Belle detector at the KEKB e+e- collider. We report the differential branching fraction, isospin asymmetry, K* polarization, and the forward-backward asymmetry (AFB) as functions of q^2 = M_{ll}^2*c^2. The fitted AFB spectrum exceeds the Standard Model expectation by 2.7 standard deviations. The measured branching fractions are B(B->K*l+l-)=(10.7+1.1-1.0+-0.9)*10^-7 and B(B->Kl+l-)=(4.8+0.5-0.4+-0.3)*10^-7, where the first errors are statistical and the second are systematic, with the muon to electron ratios R_K*=0.83+-0.17+-0.05 and R_K=1.03+-0.19+-0.06, respectively.
Chang Paoti
Wei J.-T.
No associations
LandOfFree
Measurement of the Differential Branching Fraction and Forward-Backword Asymmetry for B->K(*)l+l- does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Measurement of the Differential Branching Fraction and Forward-Backword Asymmetry for B->K(*)l+l-, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement of the Differential Branching Fraction and Forward-Backword Asymmetry for B->K(*)l+l- will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-456982