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Measurement of the time-integrated CP asymmetry in D⁰ to K⁰_S K⁰_S decays
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arxiv 1508.06087 v2 pith:O3TMFMKJ submitted 2015-08-25 hep-ex
Measurement of the time-integrated CP asymmetry in D⁰ to K⁰_S K⁰_S decays
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The time-integrated $CP$ asymmetry in the decay $D^0 \to K^0_S K^0_S$ is measured using $3 fb^{-1}$ of proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The flavour of the $D^0$ meson is determined by use of the decay $D^{*+} \to D^0 \pi^+$ and its charge conjugate mode. The result is \[ {\cal A}_{CP} = -0.029 \pm 0.052 \pm 0.022, \] where the first uncertainty is statistical and the second systematic. The result is consistent with Standard Model expectations and improves the uncertainty with respect to the only previous measurement of this quantity by more than a factor of three.
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$CP$ violation in neutral kaon mixing in $D^0\rightarrow K_SK_S$
hep-ph 2026-05 unverdicted novelty 4.0
Neutral kaon mixing adds a CP-violating effect of order 10^{-6} to a_CP in D0 -> Ks Ks, arising only from second-order weak processes and thus negligible for experiments.
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