${{\mathit D}^{0}}$ $\mathit CP$-VIOLATING DECAY-RATE ASYMMETRIES

This is the difference between ${{\mathit D}^{0}}$ and ${{\overline{\mathit D}}^{0}}$ partial widths for the decay to state ${{\mathit f}}$, divided by the sum of the widths:$
$ $\mathit A_{CP}({{\mathit f}}$) = [$\Gamma $( ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit f}}$ ) $−$ $\Gamma $( ${{\overline{\mathit D}}^{0}}$ $\rightarrow$ ${{\overline{\mathit f}}}$ )] $/$ [$\Gamma $( ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit f}}$ ) + $\Gamma $( ${{\overline{\mathit D}}^{0}}$ $\rightarrow$ ${{\overline{\mathit f}}}$ )].

$\mathit A_{\mathit CP}$( ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ) in ${{\mathit D}^{0}}$, ${{\overline{\mathit D}}^{0}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$

INSPIRE   PDGID:
S032A8
VALUE (%) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ -1.9 \pm1.1 }$ OUR AVERAGE  Error includes scale factor of 1.1.
$-3.1$ $\pm1.2$ $\pm0.5$ 8.1k 1
AAIJ
2021X
 LHCB ${{\mathit p}}{{\mathit p}}$ at 13 TeV
$-0.02$ $\pm1.53$ $\pm0.17$ 5.4k 2
DASH
2017
BELL At/near ${{\mathit \Upsilon}{(4S)}}$, ${{\mathit \Upsilon}{(5S)}}$
$-2.9$ $\pm5.2$ $\pm2.2$ 630
AAIJ
2015AT
 LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV
$-23$ $\pm19$ 65
BONVICINI
2001
CLE2 ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $\approx{}$ $10.6$ GeV
• • We do not use the following data for averages, fits, limits, etc. • •
$2.3$ $\pm2.8$ $\pm0.9$ 1.7k
AAIJ
2018AV
 LHCB see AAIJ 2021X
1  AAIJ 2021X reports a value of $-0.031$ $\pm0.012$ $\pm0.004$ $\pm0.002$ where the third uncertainty is from $\mathit A_{CP}$( ${{\mathit K}^{+}}{{\mathit K}^{-}}$ ) = $0.04$ $\pm0.12$ $\pm0.10\%$, as measured by LHCb. We have added the systematic uncertainties in quadrature. Supersedes AAIJ 2018AV.
2  The systematic uncertainty is dominated by the uncertainty on A$_{CP}$ in the control channel ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$ .
Conservation Laws:
$\mathit CP$ INVARIANCE
References:
AAIJ 2021X
PR D104 L031102 Measurement of $CP$ asymmetry in $D^0 \to K^0_S K^0_S$ decays
AAIJ 2018AV
JHEP 1811 048 Measurement of the time-integrated $CP$ asymmetry in $D^0 \rightarrow K^0_S K^0_S$ decays
DASH 2017
PRL 119 171801 Search for $\mathit CP$ Violation and Measurement of the Branching Fraction in the Decay ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$
AAIJ 2015AT
JHEP 1510 055 Measurement of the Time-Integrated $\mathit CP$ Asymmetry in ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ Decays
BONVICINI 2001
PR D63 071101 Search for $\mathit CP$ Violation in ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$ and ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ and ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ Decays