Three-body nature of N* and Delta* resonances from sequential decay chains

Thiel, A. and Sokhoyan, V. and Gutz, E. and van Pee, H. and Anisovich, A. V. and Bacelar, J. C. S. and Bantes, B. and Bartholomy, O. and Bayadilov, D. and Beck, R. and Beloglazov, Yu. and Castelijns, R. and Crede, V. and Dutz, H. and Elsner, D. and Ewald, R. and Frommberger, F. and Fuchs, M. and Funke, Ch. and Gregor, R. and Gridnev, A. and Hillert, W. and Hoffmeister, Ph. and Horn, I. and Jaegle, I. and Junkersfeld, J. and Kalinowsky, H. and Kammer, S. and Kleber, V. and Klein, Frank and Klein, Friedrich and Klempt, E. and Kotulla, M. and Krusche, B. and Lang, M. and Lohner, H. and Lopatin, I. and Lugert, S. and Mertens, T. and Messchendorp, J. G. and Metag, V. and Metsch, B. and Nanova, M. and Nikonov, V. and Novinski, D. and Novotny, R. and Ostrick, M. and Pant, L. and Pfeiffer, M. and Piontek, D. and Roy, A. and Sarantsev, A. V. and Schmidt, Ch. and Schmieden, H. and Shende, S. and Suele, A. and Sumachev, V. V. and Szczepanek, T. and Thoma, U. and Trnka, D. and Varma, R. and Walther, D. and Wendel, Ch. and Wilson, A.. (2015) Three-body nature of N* and Delta* resonances from sequential decay chains. Physical review letters, 114 (9). 091803.

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The N pi(0)pi(0) decays of positive-parity N* and Delta* 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: Delta(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(pi pi)s (wave) (abbreviated as N sigma here) as further isobars and assigns the final states to the formation of nucleon and Delta resonances and to nonresonant contributions. We observe the know Delta(1232)pi decays of Delta(1910)1/2(+), Delta(1920)3/2(+), Delta(1905)5/2(+), Delta(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(pi)(+), N(1520)3/2(pi)(-) , N(1680)5/2(pi)(+), and N sigma. The latter decay modes are observed in the decay of N* resonances and at most weakly in Delta(*) decays. It is argued that these decay modes provide evidence for a 3-quark nature of N* resonances rather than a quark-diquark structure.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:01
Deposited On:09 May 2016 08:23

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