Observation of CP Violation in Charm Decays
Collaboration
12 pages
Published in:
- Phys.Rev.Lett. 122 (2019) 21, 211803
- Published: May 29, 2019
e-Print:
- 1903.08726 [hep-ex]
PDG: = ) − )
Report number:
- LHCb-PAPER-2019-006,
- CERN-EP-2019-042
Experiments:
Citations per year
Abstract: (APS)
A search for charge-parity (CP) violation in D0→K-K+ and D0→π-π+ decays is reported, using pp collision data corresponding to an integrated luminosity of 5.9 fb-1 collected at a center-of-mass energy of 13 TeV with the LHCb detector. The flavor of the charm meson is inferred from the charge of the pion in D*(2010)+→D0π+ decays or from the charge of the muon in B¯→D0μ-ν¯μX decays. The difference between the CP asymmetries in D0→K-K+ and D0→π-π+ decays is measured to be ΔACP=[-18.2±3.2(stat)±0.9(syst)]×10-4 for π-tagged and ΔACP=[-9±8(stat)±5(syst)]×10-4 for μ-tagged D0 mesons. Combining these with previous LHCb results leads to ΔACP=(-15.4±2.9)×10-4, where the uncertainty includes both statistical and systematic contributions. The measured value differs from zero by more than 5 standard deviations. This is the first observation of CP violation in the decay of charm hadrons.Note:
- All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-006.html
- Elementary Particles and Fields
- p p: colliding beams
- D*(2010): hadronic decay
- D0: hadronic decay
- K: pair production
- pi: pair production
- anti-B0: semileptonic decay
- charm: decay
- pi: charge
- muon: charge
References(69)
Figures(48)
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