Measurement of matter–antimatter differences in beauty baryon decays
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nphys4021.pdf
Description
Published version
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609.08 KB
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Checksum (MD5)
a675502c477c4b77e0021bfa0546d4d6
Author(s)
The LHCb Collaboration
Boettcher, Thomas Julian
Ilten, Philip J
Williams, Michael
Date Issued
2017
Journal
Nature Physics
Publisher
Springer Science and Business Media LLC
Citation
Aaij, R., et al. "Measurement of Matter-Antimatter Differences in Beauty Baryon Decays." Nature Physics 13 4 (2017): 391-96.
Version
Final published version
Abstract
© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Differences in the behaviour of matter and antimatter have been observed in K and B meson decays, but not yet in any baryon decay. Such differences are associated with the non-invariance of fundamental interactions under the combined charge-conjugation and parity transformations, known as CP violation. Here, using data from the LHCb experiment at the Large Hadron Collider, we search for CP-violating asymmetries in the decay angle distributions of Λb0 baryons decaying to pπ- π+ π- and pπ-K+K- final states. These four-body hadronic decays are a promising place to search for sources of CP violation both within and beyond the standard model of particle physics. We find evidence for CP violation in Λb0 to pπ- π+ π- decays with a statistical significance corresponding to 3.3 standard deviations including systematic uncertainties. This represents the first evidence for CP violation in the baryon sector.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/NPHYS4021
