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First Determination of the Spin-Parity of Ξc⁢(3055)+,0 Baryons

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Schmelling,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2025). First Determination of the Spin-Parity of Ξc⁢(3055)+,0 Baryons. Physical Review Letters, 134(8): 081901. doi:10.1103/PhysRevLett.134.081901.


Cite as: https://hdl.handle.net/21.11116/0000-0010-CFB1-D
Abstract
The Ξb0⁢(−) → Ξc⁢(3055)+(0)⁢(→D+(0)⁢Λ)π decay chains are observed, and the spin-parity of Ξc⁢(3055)+(0) baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of √s =13  TeV, corresponding to an integrated luminosity of 5.4  fb−1, recorded by the LHCb experiment between 2016 and 2018. The spin-parity of the Ξc⁢(3055)+(0) baryons is determined to be 3/2+ with a significance of more than 6.5⁢σ (3.5σ) compared to all other tested hypotheses. The up-down asymmetries of the Ξb0⁢(−) → Ξc⁢(3055)+(0)π transitions are measured to be −0.92±0.10±0.05 (−0.92±0.16±0.22), consistent with maximal parity violation, where the first uncertainty is statistical and the second is systematic. These results support the hypothesis that the Ξc⁢(3055)+(0) baryons correspond to the first D-wave λ-mode excitation of the Ξc flavor triplet.