We measure the charge asymmetry A of like-sign dimuon events in 6.1 fb −1 of pp collisions recorded with the D0 detector at a center-of-mass energy √ s = 1.96 TeV at the Fermilab Tevatron collider.
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.
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