Searches for exotic resonances in baryonic decays of charmonia

The BESIII experiment, located at the BEPCII electron-positron-collider at the Institute for High Energy Physics in Beijing, offers high-statistics datasets at center of mass energies corresponding to J/Ψ and Ψ(2S) masses. These large samples allow studies of rare and exotic particles. The final state Λanti Λπ⁺π^- is studied based on 448 . 10⁶ Ψ(2S)- and 1.3 . 10⁹ J/Ψ events, because exotic tetraquark states with masses below the mass of the J/Ψ and decaying to a Λanti Λ pair were predicted. Since the above final state is dominated by well known decays via Ψ → Σ^±(1385) anti Σ^-+(1385), Ψ → Ξ^- anti Ξ⁺ and Ψ(2S) → J/Ψπ⁺π^-, a partial wave analysis is performed using these contributions. Deviations from the PWA result, especially in the invariant Λanti Λ mass, may be indications for exotic particles.