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Three-Body Nature ofN*andΔ*Resonances from Sequential Decay Chains

A. Thiel, V. Sokhoyan, E. Gutz, H. van Pee, A. V. Anisovich, J. C. S. Bacelar, B. Bantes, O. Bartholomy, D. Bayadilov, R. Beck, Yu. Beloglazov, R. Castelijns (+52 others)
2015 Physical Review Letters  

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The N π 0 π 0 decays of positive-parity N * and ∆ * resonances at about 2 GeV are studied at ELSA by photoproduction of two neutral pions off protons. The data reveal clear evidence for several intermediate resonances: ∆(1232), N (1520)3/2 − , and N (1680)5/2 + , with spin-parities J P = 3/2 + , 3/2 − , and 5/2 + . The partial wave analysis (within the Bonn-Gatchina approach) identifies N (1440)1/2 + and the N (ππ)S−wave (abbreviated as N σ here) as further isobars, and assigns the final states
more » ... to the formation of nucleon and ∆ resonances and to non-resonant contributions. We observe the known ∆(1232)π decays of ∆(1910)1/2 + , ∆(1920)3/2 + , ∆(1905)5/2 + , ∆(1950)7/2 + , and of the corresponding spin-parity series in the nucleon sector, N (1880)1/2 + , N (1900)3/2 + , N (2000)5/2 + , and N (1990)7/2 + . For the nucleon resonances, these decay modes are reported here for the first time. Further new decay modes proceed via N (1440)1/2 + π, N (1520)3/2 − π, N (1680)5/2 + π, and N σ. The latter decay modes are observed in the decay of N * resonances and at most weakly in ∆ * decays. It is argued that these decay modes provide evidence for a 3-quark nature of N * resonances rather than a quark-diquark structure.
doi:10.1103/physrevlett.114.091803 pmid:25793801 fatcat:c2o3l6h47vdznal4emp7zirw2e
Citation

A. Thiel, V. Sokhoyan, E. Gutz, H. van Pee, A. V. Anisovich, J. C. S. Bacelar, B. Bantes, O. Bartholomy, D. Bayadilov, R. Beck, Yu. Beloglazov, R. Castelijns, V. Crede, H. Dutz, D. Elsner, R. Ewald, F. Frommberger, M. Fuchs, Ch. Funke, R. Gregor, A. Gridnev, W. Hillert, Ph. Hoffmeister, I. Horn, I. Jaegle, J. Junkersfeld, H. Kalinowsky, S. Kammer, V. Kleber, Frank Klein, Friedrich Klein, E. Klempt, M. Kotulla, B. Krusche, M. Lang, H. Löhner, I. Lopatin, S. Lugert, T. Mertens, J. G. Messchendorp, V. Metag, B. Metsch, M. Nanova, V. Nikonov, D. Novinski, R. Novotny, M. Ostrick, L. Pant, M. Pfeiffer, D. Piontek, A. Roy, A. V. Sarantsev, Ch. Schmidt, H. Schmieden, S. Shende, A. Süle, V. V. Sumachev, T. Szczepanek, U. Thoma, D. Trnka, R. Varma, D. Walther, Ch. Wendel, A. Wilson. "Three-Body Nature ofN*andΔ*Resonances from Sequential Decay Chains." Physical Review Letters 114.9 (2015)