Resolving the low mass puzzle of Λ_c(2940)⁺

2019/10/31 by Si-Qiang Luo, Bing Chen, Zhan-Wei Liu +1 · 3 citations
Physics and Astronomy · #hep-ph #hep-ex

paper · pdf · doi:10.1140/epjc/s10052-020-7874-1

published as Eur. Phys. J. C 80 (2020) 301 · 5 pages, 2 figures. Accepted by Eur. Phys. J. C for publication

arxiv created 2020/03/26 · arxiv updated 2020/04/07

Abstract

For the long standing low mass puzzle of Λ_c(2940)⁺, we propose an unquenched picture. Our calculation explicitly shows that the mass of the Λ_c(2P,3/2^-) state can be lowered down to be consistent with the experimental data of Λ_c(2940)⁺ by introducing the D^*N channel contribution. Additionally, we give a semi-quantitative analysis to illustrate why the Λ_c(2940)⁺ state has a narrow width. It means that the low mass puzzle of Λ_c(2940)⁺ can be solved. What is more important is that we predict a mass inversion relation for the 2P Λ_c⁺ states, i.e., the Λ_c(2P,1/2^-) state is higher than the Λ_c(2P,3/2^-), which is totally different from the result of conventional quenched quark model. It provides a criterion to test such an unquenched scenario for Λ_c(2940)⁺. We expect the future experimental progress from the LHCb and Belle II.

Cited by

• Identifying triple-strangeness Ω hyperons in light of recent experimental results
• Proposed mixing between 2P and 1F wave charmonia
• Doubly charmed hexaquarks in the diquark picture