Question: At Super KEKB it is planned to collide 4 GeV positrons with 7 GeV electrons to form (4S) particles. If the latter decay to B

At Super KEKB it is planned to collide 4 GeV positrons with 7 GeV electrons to form Υ(4S) particles. If the latter decay to B^± particles with equal energies, how far will they travel on average before decaying? (The B^± particles have masses of 5.28 GeV/c² and lifetimes of 1.64 × 10⁻¹² s.)

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