Search for a bound state of Λ_cΣ_c near threshold

2025/08/26 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +698
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2508.18594

Abstract

We search for a possible Λ_c Σ_c bound state, denoted as H_c^±, via the e⁺e^- → π⁺ π^- Λ_c⁺Λ_c^- process for the first time. This analysis utilizes 207.8 and 159.3 pb^-1 of e⁺e^- annihilation data at the center-of-mass energies of 4918.02 and 4950.93 MeV, respectively, collected with the BESIII detector at the BEPCII collider. No statistically significant signal is observed. The upper limits of the product of Born cross section and branching fraction σ(e⁺e^- → π⁺ H_c^- + c.c.) × B(H_c^- → π^-Λ_c⁺Λ_c^-) at a 90% confidence level are reported at each energy point and for various H_c mass hypotheses (4715, 4720, 4725, 4730, and 4735 MeV/c²) and widths (5, 10, or 20 MeV), with the upper limits ranging from 1.1 pb to 6.4 pb.

Citations

• Systematic Errors: facts and fictions

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