Three-Body Nature of N* and Δ* Resonances from Sequential Decay Chains

被引：29

作者：

Thiel, A. ^{[1
]}

Sokhoyan, V. ^{[1
]}

Gutz, E. ^{[1
,2
]}

van Pee, H. ^{[1
]}

Anisovich, A. V. ^{[1
,3
]}

Bacelar, J. C. S. ^{[4
]}

Bantes, B. ^{[5
]}

Bartholomy, O. ^{[1
]}

Bayadilov, D. ^{[1
,3
]}

Beck, R. ^{[1
]}

Beloglazov, Yu. ^{[3
]}

Castelijns, R. ^{[4
]}

Crede, V. ^{[6
]}

Dutz, H. ^{[5
]}

Elsner, D. ^{[5
]}

Ewald, R. ^{[5
]}

Frommberger, F. ^{[5
]}

Fuchs, M. ^{[1
]}

Funke, Ch. ^{[1
]}

Gregor, R. ^{[2
]}

Gridnev, A. ^{[3
]}

Hillert, W. ^{[5
]}

Hoffmeister, Ph. ^{[1
]}

Horn, I. ^{[1
]}

Jaegle, I. ^{[7
]}

Junkersfeld, J. ^{[1
]}

Kalinowsky, H. ^{[1
]}

Kammer, S. ^{[5
]}

Kleber, V. ^{[5
]}

Klein, Frank ^{[5
]}

Klein, Friedrich ^{[5
]}

Klempt, E. ^{[1
]}

Kotulla, M. ^{[2
,7
]}

Krusche, B. ^{[7
]}

Lang, M. ^{[1
]}

Lohner, H. ^{[4
]}

Lopatin, I. ^{[3
]}

Lugert, S. ^{[2
]}

Mertens, T. ^{[7
]}

Messchendorp, J. G. ^{[4
]}

Metag, V. ^{[2
]}

Metsch, B. ^{[1
]}

Nanova, M. ^{[2
]}

Nikonov, V. ^{[1
,3
]}

Novinski, D. ^{[3
]}

Novotny, R. ^{[2
]}

Ostrick, M. ^{[5
]}

Pant, L. ^{[2
]}

Pfeiffer, M. ^{[2
]}

Piontek, D. ^{[1
]}

机构：

[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[2] Univ Giessen, Inst Phys 2, D-35392 Giessen, Germany

[3] Petersburg Nucl Phys Inst, Gatchina 188300, Russia

[4] Univ Groningen, Kernfysisch Versneller Inst, NL-9747 AA Groningen, Netherlands

[5] Univ Bonn, Inst Phys, D-53115 Bonn, Germany

[6] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[7] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 09期

基金：

俄罗斯基础研究基金会; 美国国家科学基金会;

关键词：

BARYON RESONANCES; CHIRAL DYNAMICS; PHOTOPRODUCTION; RESTORATION; SPECTROMETER; MODEL;

D O I：

10.1103/PhysRevLett.114.091803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

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