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First measurement of the B(S) meson mass

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Abstract

In a sample of about 1.1 million hadronic Z decays recorded with the ALEPH detector during the 1990–1992 running of LEP, two unambiguous BS meson candidates were observed. From these events the mass of the BS meson has been measured to be 5.3686 ± 0.0056 (stat.) ± 0.0015 (syst.) GeV.

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