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Decays of $B^0_s \to D_s^- \pi^+$ allow to determine the oscillationfrequency $\Delta m_s$ between the $B^0_s$ particle and$\kern0.18em\overline{\kern -0.18em B}{}^0_s$ antiparticle states with highprecision. It is a crucial input to constrain the CKM matrix and amanifestation of the quantum nature of physics. A new measurement of thisfrequency is presented, using a dataset corresponding to $6\,\mathrm{fb}^{-1}$of $pp$ collisions, recorded by LHCb at a centre-of-mass energy of$13\,\mathrm{TeV}$. The oscillation frequency is determined to be $\Delta m_s =17.7683\pm0.0051(\mathrm{stat.})\pm0.0032(\mathrm{syst.})\,\mathrm{ps}^{-1}$and a combination with previous LHCb measurements yields $\Deltam_s^\mathrm{LHCb} = 17.7656\pm0.0057\,\mathrm{ps}^{-1}$.

Precision Measurement of the $B_s-\kern0.18em\overline{\kern -0.18em  B}{}^0_s$ Oscillation Frequency $\Delta m_s$ with $B_s\to D_s^-\pi^+$ Decays  at LHCb