Journal article
Observation of CP violation in charm decays
- 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 ¯B→D0μ−¯νμX 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.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 360.9KB, Terms of use)
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- Publisher copy:
- 10.1103/physrevlett.122.211803
- Publisher:
- American Physical Society
- Journal:
- Physical Review Letters More from this journal
- Volume:
- 122
- Issue:
- 21
- Article number:
- 211803
- Publication date:
- 2019-05-29
- Acceptance date:
- 2019-05-07
- DOI:
- EISSN:
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1079-7114
- ISSN:
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0031-9007
- Pmid:
-
31283320
- Language:
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English
- Keywords:
- Pubs id:
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1012693
- Local pid:
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pubs:1012693
- Deposit date:
-
2020-04-23
Terms of use
- Copyright holder:
- CERN
- Copyright date:
- 2019
- Rights statement:
- © 2019 CERN, for the LHCb Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
- Licence:
- CC Attribution (CC BY)
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