Measurement of the CP Violation Parameter AΓ in D0 → K+K− and D0 → π + π − Decays

LHCb Collaboration, R Aaij, Marco Adinolfi, Emma Buchanan, Andrew Cook, Jeremy Dalseno, Sam Harnew, James Kariuki, Paras Naik, Konstantinos Petridis, Gabriela Pomery, Eugenia Price, Claire Prouve, Renato Quagliani, Jonas Rademacker, Sophie Richards, Daniel Saunders, Nicola Skidmore, Jaap Velthuis

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Asymmetries in the time-dependent rates of D0 → KþK− and D0 → πþπ− decays are measured in a pp
collision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integrated
luminosity of 3 fb−1. The asymmetries in effective decay widths between D0 and D0 decays, sensitive to
indirect CP violation, are measured to be AΓðKþK−Þ¼ð−0.30 0.32 0.10Þ × 10−3 and AΓðπþπ−Þ ¼
ð0.46 0.58 0.12Þ × 10−3, where the first uncertainty is statistical and the second systematic. These
measurements show no evidence for CP violation and improve on the precision of the previous best
measurements by nearly a factor of two.
Original languageEnglish
Article number261803
JournalPhysical Review Letters
Publication statusPublished - 28 Jun 2017

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  • Projects

    Bristol Consolidated Grant 2015-9

    Goldstein, J.


    Project: Research

    Cite this

    LHCb Collaboration, Aaij, R., Adinolfi, M., Buchanan, E., Cook, A., Dalseno, J., Harnew, S., Kariuki, J., Naik, P., Petridis, K., Pomery, G., Price, E., Prouve, C., Quagliani, R., Rademacker, J., Richards, S., Saunders, D., Skidmore, N., & Velthuis, J. (2017). Measurement of the CP Violation Parameter AΓ in D0 → K+K− and D0 → π + π − Decays. Physical Review Letters, 118, [261803].