Toward discovering low-lying P-wave excited Σ c baryon states *

Abstract

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