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b-PHYSICS MEASUREMENTS AT THE TEVATRON: m AND ∆m

We present experimental results on b-hadron mass measurements and b-meson oscillations based on integrated luminosity of 250 to 450 pb −1 of p¯ p collisions at √ 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/ψ. A blind search of the decay mode Bc → J/ψπ + resulted in a peak of 18.9 ± 5.4 candidates at a mass value of 6287.0 ± 4.5 ± 1.1 MeV/c 2. A new limit has been set to the decay B d,s → µ + µ −. Both the CDF and D0 collaborations are in the position to put a limit on the frequency of the Bs oscillations. D0 reports ∆ms > 5.0 ps −1 .