Measurement of the time-integrated $CP$ asymmetry in $D^0\to K_S^0{K}_S^0$ decays

Abstract

The time-integrated $CP$ asymmetry in the decay $D^0\to K_S^0{K}_S^0$ is measured using $3f{b}^{-1}$ 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 $D^{\ast +}\to D^0{\pi }^{+}$ 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.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-030.html

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• PYTHIA 6.4 Physics and Manual
• Big-Bang Nucleosynthesis
• Measurement of the difference of CP-violating asymmetries in D0 -> K+K- and D0 ->pi+pi- decays at CDF
• CP Violation in $D^0\to K_S{K}_S$

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