First Determination of the Spin-Parity of Ξ_{c}(3055)^{+,0} Baryons.



Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinén, F, Ackernley, T ORCID: 0000-0002-5951-3498, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C
et al (show 1128 more authors) (2025) First Determination of the Spin-Parity of Ξ_{c}(3055)^{+,0} Baryons. Physical review letters, 134 (8). 081901-. ISSN 0031-9007, 1079-7114

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Abstract

The Ξ_{b}^{0(-)}→Ξ_{c}(3055)^{+(0)}(→D^{+(0)}Λ)π^{-} decay chains are observed, and the spin-parity of Ξ_{c}(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 sqrt[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 Ξ_{c}(3055)^{+(0)} baryons is determined to be 3/2^{+} with a significance of more than 6.5σ (3.5σ) compared to all other tested hypotheses. The up-down asymmetries of the Ξ_{b}^{0(-)}→Ξ_{c}(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 Ξ_{c}(3055)^{+(0)} baryons correspond to the first D-wave λ-mode excitation of the Ξ_{c} flavor triplet.

Item Type: Article
Uncontrolled Keywords: LHCb Collaboration
Divisions: Faculty of Humanities and Social Sciences
Faculty of Science and Engineering
Faculty of Science and Engineering > School of Engineering
Faculty of Science and Engineering > School of Physical Sciences
Faculty of Humanities and Social Sciences > School of the Arts
Depositing User: Symplectic Admin
Date Deposited: 09 Jun 2025 10:08
Last Modified: 09 Jun 2025 10:08
DOI: 10.1103/physrevlett.134.081901
Open Access URL: https://journals.aps.org/prl/pdf/10.1103/PhysRevLe...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3193125