Toward discovering low-lying P-wave excited∑_(c)baryon states  

作　　者：Kai-Lei Wang Xian-Hui Zhong 王凯雷;钟显辉(Department of Electronic Information and Physics,Changzhi University,Changzhi 046011,China;Department of Physics,Hunan Normal University,and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,Changsha 410081,China;Synergetic Innovation Center for Quantum Effects and Applications(SICQEA),Hunan Normal University,Changsha 410081,China)

机构地区：[1]Department of Electronic Information and Physics,Changzhi University,Changzhi 046011,China [2]Department of Physics,Hunan Normal University,and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,Changsha 410081,China [3]Synergetic Innovation Center for Quantum Effects and Applications(SICQEA),Hunan Normal University,Changsha 410081,China

出　　处：《Chinese Physics C》2022年第2期24-34,共11页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(U1832173,11775078);Scientific and Technological Innovation Programs of Higher Education Institutions of Shanxi Province,China(2020L0617)。

摘　　要：In this study,by combining the equal spacing rule with recent observations of Ω_(C)(X)and Ξ_(C)(X)baryons,we predict the spectrum of the low-lying λ-mode 1P-wave excited ∑_(c) states.Furthermore,their strong decay properties are predicted using the chiral quark model and the nature of∑_(c)(2800)is investigated by analyzing the invariant mass spectrum.The ∑_(c)(2800)structure observed in the Λ_(c)πmass spectrum was found to potentially arise from two overlapping P-wave resonances,∑_(c)(2813)3/2^(-)and ∑_(c)(2840)5/2^(-).These resonances have similar decay widths of Г〜40 MeV and predominantly decay into the Λ_(c)π channel.The ∑_(c)(2755)1/2^(-)state is likely to be a very narrow state with a width of Г〜15 MeV,with its decays almost saturated by the Λ_(c)π channel.Additionally,evidence of the Lc(2755)1/2^(-)resonance as a very narrow peak may be seen in the Λ_(c)π invariant mass spectrum.The other two P-wave states,∑_(c)(2746)1/2^(-)and ∑_(c)(2796)3/2^(-),are relatively narrow states with similar widths of「〜30 MeV and predominantly decay into ∑_(c)π and ∑^(*)_(c)π,respectively.This study can provide useful references for discovering these low-lying P-wave states in forthcoming experiments.

关 键 词：quark model strong decay ∑_(c)baryons 

分 类 号：O572.34[理学—粒子物理与原子核物理]