Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Hadron Structure and Spectroscopy IV
HK 23.4: Vortrag
Dienstag, 15. März 2016, 17:30–17:45, S1/01 A5
Rescattering effects for a three-body final state — •Mikhail Mikhasenko and Bernhard Ketzer — Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany
The isobar model is a phenomenological approach commonly used to describe multiparticle final states as sequential two-body decays into intermediate resonances (isobars), which then decay into the final state observed in the experiment without further interaction. We stress that in presence of a significant inelasticity in the reaction, strong effects of rescattering appear which can produce a resonance-like enhancement in the subchannels as well as in the three body invariant mass. The Khury-Treiman equations inspired by unitarity and analyticity are a powerful tool to investigate the influence of rescattering. We show that the leading order triangle diagram already gives a good approximation to the complete rescattering series. We discuss the effect of rescattering for several examples: the 3π final state related to the a1(1420) observed by COMPASS and VES experiments, J/Ψ p K related to the recently observed pentaquark candidates and J/Ψππ related to exotic XYZ states. The work is supported by BMBF.