2025/02/05 by Quan-Yun Guo, Dian-Yong Chen, Guo, Quan-Yun +1
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #Particle physics theoretical and experimental studies #High-Energy Particle Collisions Research
paper · pdf · doi:10.48550/arxiv.2502.03277
In the present work, we propose to investigate the productions of Λc(2910) and Λc(2940) in the π- p → D- D0 p processes by utilizing an effective Lagrangian approach, where Λc(2910) and Λc(2940) are considered as D^∗ N molecular states with JP quantum numbers to be 1/2- and 3/2-, respectively. With the cutoff parameter determined by the upper limit of the cross sections for π- p → D∗- Λc(2286), the ratios of the cross sections for π- p → D∗- Λc(2286), π- p → D- Λc(2286), π- p → D- Λc(2910), and π- p → D- Λc(2940) are estimated to be 1:4.8:1.42:0.26 at pπ=30 GeV. Considering that the Λc(2910) and Λc(2940) state can further decay into D0p, we estimate the cross sections for π- p → D- D0 p process and the differential cross sections depending on the D0 p invariant mass spectrum. Our estimations indicate that the total cross sections are (0.49+1.56-0.38) nb when pπ=15~GeV, where the uncertainties result from the variation of the Λr. By comparing the contributions of the s, u, and t-channels, we conclude that the t-channel plays the predominant role. Moreover, the present estimations suggest that the structure around 2.9 GeV in the D0 p invariant mass spectrum of the π- p → D- D0 p process should correspond to Λc(2910) rather than Λc(2940), which can be tested by further experimental measurements at J-PARC in the future.