2024/07/14 by Nongnapat Ponkhuha, Ponkhuha, Nongnapat, Ahmad Jafar Arifi +3 · 1 citation
Physics and Astronomy · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #High-Energy Particle Collisions Research
paper · pdf · doi:10.48550/arxiv.2407.10063
We investigate two-pion emission decays of singly charmed and bottom baryons, focusing on ΛQ^*(1P) and ΞQ^*(1P) with Q=c (charm) or b (bottom) quarks and JP=1/2-,3/2-, belonging to antisymmetric flavor triplet \boldsymbol3F. Our analysis encompasses both sequential processes, involving intermediate states belonging to symmetric flavor sextet \boldsymbol6F such as ΣQ(1S) and ΞQ^′(1S) respectively with JP=1/2+,3/2+, derived from the chiral quark model, and direct process crucial for comparison with experimental data, whose coupling constants estimated using the chiral-partner scheme. We also incorporate the convolution of the parent particle's mass for the Dalitz plot, enabling a more realistic comparison with experimental data. We scrutinize the Dalitz plots of these negative parity states in light of recent Belle measurements for Λc(2625)+. Our findings support the assignment of Λc(2625)+ as the λ-mode excitation with JP=3/2- in the quark model, deduced from the the Λcπ invariant mass distribution, and we then give predictions for other cases, including the ΞQ^* decays. The observed asymmetry in the ππ invariant mass distribution underscores the important role of the direct process, reflecting the chiral-partner structure in the heavy baryon sector. It is evident that the presence of the direct process is not significant in the three-body decays unless the S-wave resonance contribution is suppressed. We suggest further experimental verification to test our predictions and get more insights into the structure of heavy baryons.