CP violation in Bs mixing at LHCb

The CP violating phase $ϕ_s$ can be measured in the interference between mixing and decay of $B_s^0$ mesons decaying to CP eigenstates. The phase $ϕ_s$ the decay width difference $ΔΓ_s$ and the average decay width $Γ_s$ have been measured at LHCb, using the full 1 fb$^{-1}$ of $pp$ collisions data at a centre-of-mass energy $\sqrt{s}$ = 7 TeV collected during the 2011 LHC run.

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