Search for CP violation in D+s → K0Sπ+, D→ K0SK+, and D+ → ϕπ+ decays

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  • LHCb Collaboration

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  • Institution Nikhef National Institute for Subatomic Physics
  • Universitat de Barcelona
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  • University of Liverpool
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  • Institute for Nuclear Research, Russian Academy of Sciences
  • Department of Biology and Evolution; University of Ferrara; Ferrara; Italy
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A search for charge-parity (CP) violation in Cabibbo-suppressed D+s → K0Sπ+, D→ K0SK+, and D+ → ϕπ decays is reported using proton-proton collision data, corresponding to an integrated luminosity of 3.8 fb−1 , collected at a center-of-mass energy of 13 TeV with the LHCb detector. High-yield samples of kinematically and topologically similar Cabibbo-favored D+(s) decays are analyzed to subtract nuisance asymmetries due to production and detection effects, including those induced by CP violation in the neutral kaon system. The results are

ACP(D+→ K0Sπ+) = (1.3±1.9±0.5)×10−3,

ACP(D→ K0SK+) = (−0.09±0.65±0.48)×10−3,

ACP(D→ ϕπ+) = (0.05±0.42±0.29)×10−3,

where the first uncertainties are statistical and the second systematic. They are the most precise measurements of these quantities to date, and are consistent with CP symmetry. A combination with previous LHCb measurements, based on data collected at 7 and 8 TeV, is also reported. 


Original languageEnglish
Article number191803
Number of pages11
JournalPhysical Review Letters
Issue number19
Publication statusPublished - 17 May 2019

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