Search for time-dependent CP violation in D0→K+K− and D0→π+π− decays
Name
PhysRevD.104.072010.pdf
Description
Published version
Size
1.11 MB
Format
Adobe PDF
Checksum (MD5)
dbd2a2f1efee8ea7c8c75c67017268f2
Author(s)
Williams, Michael
Date Issued
2021
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Williams, Michael. 2021. "Search for time-dependent CP violation in D0→K+K− and D0→π+π− decays." Physical Review D, 104 (7).
Version
Final published version
Abstract
A search for time-dependent violation of the charge-parity symmetry in $D^0
\to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$ decays is performed at the LHCb
experiment using proton-proton collision data recorded from 2015 to 2018 at a
centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6
fb$^{-1}$. The $D^0$ meson is required to originate from a $D^*(2010)^+ \to D^0
\pi^+$ decay, such that its flavour at production is identified by the charge
of the accompanying pion. The slope of the time-dependent asymmetry of the
decay rates of $D^0$ and $\bar{D}^0$ mesons into the final states under
consideration is measured to be $\Delta Y_{K^+ K^-} = (-2.3 \pm 1.5 \pm 0.3)
\times 10^{-4}$, $\Delta Y_{\pi^+ \pi^-} = (-4.0 \pm 2.8 \pm 0.4)\times
10^{-4}$, where the first uncertainties are statistical and the second are
systematic. These results are compatible with the conservation of the
charge-parity symmetry at the level of 2 standard deviations and improve the
precision by nearly a factor of two.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1103/PHYSREVD.104.072010
