violation in semi-leptonic B decays at LHCb

3rd Symposium on Prospects in the Physics of Discrete Symmetries

Bird, Thomas^1

School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom^1

关键词: Charge asymmetries;    CP violations;    Data driven technique;    Invariant mass distribution;    Large Hadron Collider;    Leptonic B decays;    Time dependent;    Time dependent measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/447/1/012021/pdf
DOI  :  10.1088/1742-6596/447/1/012021

来源: IOP

【 摘 要 】

Three methods of measuring the CP violating quantities asfsand adfsare discussed. The LHCb experiment is used to measure semi-leptonic Bdand Bsdecays from pp collisions created by the Large Hadron Collider. The flavour specific decays of Bs→ Ds(φπ)μν are selected and the final state charge asymmetry is measured, which to first order is proportional to asfs. This is done by fitting the KKtv invariant mass distributions to determine the yield of both D+sμ-and D-sμ+events. The charge-dependant efficiency for selecting this decay is measured using data-driven techniques. Using this information, the yields are corrected and the final state charge asymmetry is obtained, resulting in asfs= (-0.24±0.54±0.33)%. Finally two proposed LHCb measurements are described: a time-dependent difference and sum measurement asfs± adfsand a time-dependent measurement of adfs.