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Publication - Dr Jeremy Dalseno

    Measurement of CP asymmetry in Bs0 → Ds K± decays


    Adinolfi, M, Buchanan, E, Chapman, M, Dalseno, J, Harnew, S, Kariuki, J, Maddrell-Mander, S, Naik, P, Petridis, K, Pomery, G, Price, E, Prouve, C, Rademacker, J, Richards, S, Saunders, D, Skidmore, N, Velthuis, J & , 2018, ‘Measurement of CP asymmetry in Bs0 → Ds K± decays’. Journal of High Energy Physics, vol 2018.


    We report the measurements of the CP -violating parameters in B s 0  → D s K± decays observed in pp collisions, using a data set corresponding to an integrated luminosity of 3.0 fb−1 recorded with the LHCb detector. We measure C f = 0.73 ± 0.14 ± 0.05, A f ΔΓ  = 0.39 ± 0.28 ± 0.15, AΔΓf¯¯¯=0.31±0.28±0.15, S f = −0.52 ± 0.20 ± 0.07, Sf¯¯¯=−0.49±0.20±0.07,
    where the uncertainties are statistical and systematic, respectively.
    These parameters are used together with the world-average value of the B s 0 mixing phase, −2β s , to obtain a measurement of the CKM angle γ from B s 0  → D s K± decays, yielding γ = (128 − 22 + 17 )° modulo 180°, where the uncertainty contains both statistical and systematic contributions. This corresponds to 3.8 σ evidence for CP violation in the interference between decay and decay after mixing.

    Full details in the University publications repository