Measurement of the <i>CP</i> Violation Parameter <i>A<sub>Γ</sub></i> in <i>D</i><SUP>0</SUP> → <i>K</i><SUP>+</SUP><i>K</i><SUP>-</SUP> and <i>D</i><SUP>0</SUP> → π<SUP>+</SUP>π<SUP>-</SUP> Decays

Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G
et al (show 762 more authors) (2017) Measurement of the <i>CP</i> Violation Parameter <i>A<sub>Γ</sub></i> in <i>D</i><SUP>0</SUP> → <i>K</i><SUP>+</SUP><i>K</i><SUP>-</SUP> and <i>D</i><SUP>0</SUP> → π<SUP>+</SUP>π<SUP>-</SUP> Decays. PHYSICAL REVIEW LETTERS, 118 (26). 261803-.

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Asymmetries in the time-dependent rates of D^{0}→K^{+}K^{-} and D^{0}→π^{+}π^{-} 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 D^{0} and D[over ¯]^{0} decays, sensitive to indirect CP violation, are measured to be A_{Γ}(K^{+}K^{-})=(-0.30±0.32±0.10)×10^{-3} and A_{Γ}(π^{+}π^{-})=(0.46±0.58±0.12)×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.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at
Uncontrolled Keywords: LHCb Collaboration
Depositing User: Symplectic Admin
Date Deposited: 11 Sep 2017 13:20
Last Modified: 11 Oct 2023 17:01
DOI: 10.1103/PhysRevLett.118.261803
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