First determination of the spin-parity of Ξ_c(3055)^+,0 baryons

2024/09/09 by LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1112 · 1 voice · 2 citations
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1103/physrevlett.134.081901

arxiv published 2024/09/09 · arxiv updated 2025/04/01

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 √(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.

Cited by

• COWs and their Hybrids: A Statistical View of Custom Orthogonal Weights
• Ξ_c(3055) as a scaling point to establish the excited Ξ_c^(′) family

Discussions

• First determination of the spin-parity of Ξc(3055) baryons arxiv.org/abs/2409.05440 - The spin-parity of the Ξc(3055)⁺ (Ξc(3055)⁰) baryons is determined to be 3/2+ with a significance of more than 6.5 [bsky, 4 points, 0 comments]

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• Investigations of Λ states with spin-parity (3)/(2)^±
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