Drupal-Bibcite17<style face="normal" font="default" size="100%">Measurement of the CP-violating weak phase $\phi_s$ and the decay width difference $Δ \Gamma_s$ using the B$_s^0 \to J/\psi\phi$(1020) decay channel in pp collisions at $\sqrts=$ 8 TeV</style>