An asymmetric beauty factory operates at the (4 1 S 3 ), namely at s = 10580

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An asymmetric beauty factory operates at the ϒ(41S3), namely at √s = 10580 MeV, to study the process e+e- → B00. ‘Asymmetric’ means that the centre of mass moves in the reference frame of the collider. Consider an event in which both mesons are produced with the Lorentz factor βγ = 0.56. The decay vertex of one of them is at 120 μm from the principal vertex; amongst the B decay products there is a μ+. How many lifetimes did the particle live? What can we say about the two flavours? The second B decays at 0.5 mm, again with a μ in its final state. How many lifetimes did it live? Can the μ be positive? Why?

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