Observation of CP Violation in Charm Decays

LHCb Collaboration

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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 B̄→D0μ-ν̄μX 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.

Original languageEnglish (US)
Article number211803
JournalPhysical Review Letters
Volume122
Issue number21
DOIs
StatePublished - May 29 2019

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parity
decay
mesons
hadrons
center of mass
muons
standard deviation
pions
luminosity
asymmetry
collisions
detectors
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Observation of CP Violation in Charm Decays. / LHCb Collaboration.

In: Physical Review Letters, Vol. 122, No. 21, 211803, 29.05.2019.

Research output: Contribution to journalArticle

LHCb Collaboration. / Observation of CP Violation in Charm Decays. In: Physical Review Letters. 2019 ; Vol. 122, No. 21.
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abstract = "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 B̄→D0μ-ν̄μX 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.",
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