Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-08-04
Phys.Rev.Lett.101:261802,2008
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 1 postscript figure, submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.101.261802
We report a measurement of the branching fractions of Bbar -> D** l^- nubar_l decays based on 417 fb-1 of data collected at the Upsilon(4S) resonance with the BaBar detector at the PEP-II e+e- storage rings. Events are selected by fully reconstructing one of the B mesons in a hadronic decay mode. A fit to the invariant mass differences m(D(*)pi)-m(D(*)) is performed to extract the signal yields of the different D** states. We observe the Bbar -> D** l^- nubar_l decay modes corresponding to the four D** states predicted by Heavy Quark Symmetry with a significance greater than six standard deviations including systematic uncertainties.
"The BABAR Collaboration
Aubert B.
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