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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Hadron Structure and Spectroscopy IV
HK 22.6: Vortrag
Dienstag, 27. Februar 2018, 18:00–18:15, HZO 50
Searches for exotic resonances in baryonic decays of charmonia — •Jan Reher — Insitut für Experimantalphysik I, Ruhr-Universität Bochum
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 Λ 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 Λ Λ pair were predicted.
Since the above final state is dominated by well known decays via Ψ → Σ±(1385) Σ∓(1385), Ψ → Ξ− Ξ+ and Ψ(2S) → J/Ψ π+ π−, a partial wave analysis is performed using these contributions. Deviations from the PWA result, especially in the invariant Λ Λ mass, may be indications for exotic particles.
Supported by DFG (FOR 2359)