Measurement of $\gamma$ from time-dependent analysis of $B_s^0\to D_s^{\mp}K^{\pm}$

We report the measurement of the time-dependent CP violating observables in B 0 s → D ∓ s K ± decays. The study is performed using a dataset corresponding to 3.0 fb − 1 of pp collisions recorded in the LHCb detector in Run I of the LHC. We measure C f = 0 . 735 ± 0 . 142 ± 0 . 048, S f = − 0 . 518 ± 0 . 202 ± 0 . 073, S ̄ f = − 0 . 496 ± 0 . 197 ± 0 . 071, A ∆Γ f = 0 . 395 ± 0 . 277 ± 0 . 122, A ∆Γ f = 0 . 314 ± 0 . 274 ± 0 . 107, where the uncertainties are statistical and systematic, respectively. Using these observables, the CKM angle γ is determined to be ( 127 + 17 − 22 ) ◦ modulo 180 ◦ at 68% CL, where the uncertainty contains both statistical and systematic components