(1) University of Glasgow, Glasgow, G12 8QQ, Scotland
We present experimental results on b-hadron mass measurements and b-meson oscillations based on integrated luminosity of 250 to 450 pb-1 of ppbar collisions at sqrt(s) = 1.98 TeV by the CDF and D0 collaborations at the TeVatron. The masses of b-hadrons have been measured precisely by the CDF collaboration in decays containing a J/&psi . A blind search of the decay mode Bc -> J/&psi &pi resulted in a peak of 18.9 +/- 5.4 candidates at a mass value of (6287.0 +/- 4.5 +/- 1.1) MeV/c². A new limit has been set to the decay B_(d,s) -> &mu+ &mu -. Both CDF and D0 collaborations are in the position to put a limit on the frequency of the Bs oscillations. D0 reports &Delta m_s > 5.0 ps-1.
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