Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 63: Hadron Structure and Spectroscopy X
HK 63.2: Talk
Friday, March 18, 2016, 14:30–14:45, S1/01 A4
Study of NΣ Cusp in p + p → p + K+ + Λ with Partial Wave Analysis — •S. Lu1, R. Muenzer1, E. Epple1, L. Fabbietti1,3, J. Ritman2, E. Roderburg2, and F. Hauenstein2 — 1Excellenz Cluster Universe - Technische Universität München — 2FZ Jülich — 3Hades and FOPI Collaboration
In the last years, an analysis of exclusive reaction of p + p → p + K+ + Λ has been carried out using Bonn-Gatchina Partial Wave Analysis. In a combined analysis of data from Hades, Fopi, Disto and Cosy-TOF, an energy dependent production process is determined. This analysis has shown that a sufficient description of the p + p → p + K+ + Λ is quite challanging due to the presence of resonances N* and interference, which requires Partial Wave Analysis. A pronounced narrow structure is observed in its projection on the pΛ-invariant mass. This peak structure, which appears around the NΣ threshold, has a strongly asymmetric structure and is interpreted a NΣ cusp effect. In this talk, the results from a combined analysis will be shown, with a special focus on the NΣ cusp structure and a description using Flattė parametrization.*supported by the DFG Project FA 898/2-1