First Determination of the Spin-Parity of Baryons
Journal Article
·
· Physical Review Letters
The decay chains are observed, and the spin-parity of baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of , corresponding to an integrated luminosity of , recorded by the LHCb experiment between 2016 and 2018. The spin-parity of the baryons is determined to be with a significance of more than ( ) compared to all other tested hypotheses. The up-down asymmetries of the transitions are measured to be ( ), consistent with maximal parity violation, where the first uncertainty is statistical and the second is systematic. These results support the hypothesis that the baryons correspond to the first -wave -mode excitation of the flavor triplet.
© 2025 CERN, for the LHCb Collaboration 2025 CERN- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI ID:
- 2525973
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 134; ISSN 0031-9007; ISSN PRLTAO
- Publisher:
- American Physical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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