Measurement of the $B_s^0\to J/\psi \eta$ lifetime

LHCb collaboration, R. Aaij, B. Adeva +753

Using a data set corresponding to an integrated luminosity of $3f{b}^{-1}$, collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV, the effect…