Breakthrough Tracker record
Observation of charge–parity symmetry breaking in baryon decays
LHCb measured significant asymmetries between a beauty baryon's decay rate and that of its antibaryon. This is the first observation of CP violation in baryon decay.
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- Stable ID
cp-violation-baryon-decays-2025- Revision
cp-violation-baryon-decays-2025.v1- Field
- Physics · Experimental particle and flavour physics
- Evidence
- Tier 1 · Peer reviewed: Yes
- Record state
- Current · Peer-reviewed experimental observation
- Last checked
AI role
No AI assistance was disclosed in the paper or linked reporting.
Record details
- Problem or result
- Whether CP violation, previously observed in mesons, can be observed in baryon decays
- Authors
- LHCb Collaboration
- Institutions
- International LHCb collaboration at CERN
- Result date
- March 25, 2025; published July 16, 2025
Why it matters
The result opens a new class of matter–antimatter asymmetry measurements and a new test bed for the Standard Model.
Limits
CP violation is already part of the Standard Model, and this result alone does not explain the universe's matter excess. It is not by itself evidence for a new force or particle.
Sources
- Primary: LHCb paper in Nature
- Independent: CERN result explanation
Correction and revision history
- Initial entry; preliminary reporting was followed by the peer-reviewed Nature publication.
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