Observation and properties of the orbitally excited B_(s2)(*) meson

Phys Rev Lett. 2008 Feb 29;100(8):082002. doi: 10.1103/PhysRevLett.100.082002. Epub 2008 Feb 28.

Abstract

We report the direct observation of the excited L=1 state B_(s2)(*) in fully reconstructed decays to B+K-. The mass of the B_(s2)(*) meson is measured to be 5839.6+/-1.1(stat)+/-0.7(syst) MeV/c(2), and its production rate relative to the B+ meson is measured to be [1.15+/-0.23(stat)+/-0.13(syst)]%.