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

Abstract

A measurement of the $CP$ asymmetry in $D^0\to K_S^0{K}_S^0$ decays is reported, based on a data sample of proton-proton collisions collected by the LHCb experiment from 2015 to 2018, corresponding to an integrated luminosity of 6 fb${}^{-1}$. The flavor of the $D^0$ candidate is determined using the charge of the $D^{\ast \pm }$ meson, from which the decay is required to originate. The $D^0\to K^{+}{K}^{-}$ decay is used as a calibration channel. The time-integrated $CP$ asymmetry for the $D^0\to K_S^0{K}_S^0$ mode is measured to be: $$A^{CP}(D^0\to K_S^0{K}_S^0)=(-3.1\pm 1.2\pm 0.4\pm 0.2)\%,$$ where the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty on the $CP$ asymmetry of the calibration channel. This is the most precise determination of this quantity to date.

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-047.html (LHCb public pages)

References in corpus (6)

• PYTHIA 6.4 Physics and Manual
• Performance of the LHCb Vertex Locator
• Observation of $CP$ violation in charm decays
• Branching ratios and direct CP asymmetries in $D\to PP$ decays
• Revisiting CP violation in $D\to PP$ and $VP$ decays
• On $SU(3{)}_F$ Breaking through Final State Interactions and CP Asymmetries in $D\to PP$ Decays

Cited by in corpus (6)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Search for $CP$ violation in D${}^0$ $\to$ K${}_{\mathrm{S}}^0$K${}_{\mathrm{S}}^0$ decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Measurement of the time-integrated CP asymmetry in $D^0\to K_S^0{K}_S^0$ decays using Belle and Belle II data
• A Review of $CP$ Violation Measurements in Charm at LHCb
• Measurement of the time-integrated $CP$ asymmetry in $D^0\to K_{\mathrm{S}}^0{K}_{\mathrm{S}}^0$ decays using opposite-side flavor tagging at Belle and Belle II