Journal article
Measurement of matter–antimatter differences in beauty baryon decays
- Abstract:
- 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 Λ b 0 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 Λ b 0 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.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
Actions
Access Document
- Files:
-
-
(Preview, Version of record, pdf, 569.8KB, Terms of use)
-
- Publisher copy:
- 10.1038/nphys4021
Authors
- Publisher:
- Nature Publishing Group
- Journal:
- Nature Physics More from this journal
- Volume:
- 13
- Issue:
- 4
- Pages:
- 391-396
- Publication date:
- 2017-01-01
- Acceptance date:
- 2016-12-21
- DOI:
- EISSN:
-
1745-2481
- ISSN:
-
1745-2473
- Keywords:
- Pubs id:
-
pubs:646191
- UUID:
-
uuid:372b7022-fdae-49ed-b86f-a582996e71dc
- Local pid:
-
pubs:646191
- Source identifiers:
-
646191
- Deposit date:
-
2017-11-03
Terms of use
- Copyright holder:
- Macmillan Publishers Limited
- Copyright date:
- 2017
- Notes:
- © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
- Licence:
- CC Attribution (CC BY)
If you are the owner of this record, you can report an update to it here: Report update to this record