2024/12/31 by Yuejun Zhang, Zhang, Yu-Bin, Li-Ye Xiao +3 · 2 citations
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Quantum chaos and dynamical systems
paper · pdf · doi:10.48550/arxiv.2501.00268
openalex publication_date 2024/12/31 · openalex created_date 2025/01/04 · openalex updated_date 2026/07/28
Inspired by the latest experimental progress, we systematically study the OZI-allowed two-body strong decay properties of 1P-, 1D-, 2S- and 2P-wave Λc baryons within the j -j coupling scheme in the framework of the quark pair creation model. The calculations indicate that: (i) Taking the observed states Λc(2595)+ and Λc(2625)+ as the 1P-wave λ-modes states Λc|JP=1/2-,1⟩λ and Λc|JP=3/2-,1⟩λ, respectively, we can reproduce the experimental data well in theory. (ii) Combining with the measured mass and the decay properties of Λc(2860)+, this excited state can be explained as 1D-wave λ-mode state Λc|JP=3/2+,1⟩λλ. (iii) The newly observed state Λc(2910)+ may be assigned as one of the 1P-wave ρ-mode states Λc|JP=3/2-,2⟩ρ or Λc|JP=5/2-,2⟩ρ. Meanwhile, we notice that the partial decay width ratio between Σcπ and Σc^*π for the two candidates is significantly different. Hence, experimental progress in this ratio measurement may shed light on the nature of Λc(2910)+. (iv) According to the properties of Λc(2765)+, we find that the 2S-wave λ-mode state Λc1|JP=1/2+,0⟩λ may be a potential candidate. (v) The 2P-wave λ-mode state Λc1|JP=3/2-,1⟩λ is mostly likely to be a good assignment of the controversial state Λc(2940)+. Both the total decay width and partial decay ratio between pD0 and Σcπ are in good agreement with the observations. (vi) In addition, for the missing Λc excitations, we obtain their strong decay properties and hope that's useful for future experimental exploration.