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Measurement of the B s 0 → J / ψ η lifetime
49-mathematical-sciences-for-202051-physical-sciences-for-20205106-nuclear-and-plasma-physics-for-2020
Using a data set corresponding to an integrated luminosity of 3 fb − 1 , collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV, the effective lifetime in the B s 0 → J / ψ η decay mode, τ eff , is measured to be τ eff = 1.479 ± 0.034 (stat) ± 0.011 &
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