Photoproduction of η mesons off protons for 0.75 GeV<Eγ<3 GeV -: art. no. 012004

被引：155
|
作者：
Credé, V
Bartholomy, O
Anisovich, AV
Anton, G
Bantes, R
Beloglazov, Y
Bogendörfer, R
Castelijns, R
Ehmanns, A
Ernst, J
Fabry, I
Flemming, H
Fösel, A
Freiesleben, H
Fuchs, M
Funke, C
Gothe, R
Gridnev, A
Gutz, E
Höffgen, SK
Horn, I
Hössl, J
Joosten, R
Junkersfeld, J
Kalinowsky, H
Klein, F
Klempt, E
Koch, H
Konrad, M
Kopf, B
Krusche, B
Langheinrich, J
Löhner, H
Lopatin, I
Lotz, J
Matthäy, H
Menze, D
Messchendorp, J
Morales, C
Novinski, D
Ostrick, M
van Pee, H
Radkov, A
Reinnarth, J
Sarantsev, AV
Schadmand, S
Schmidt, C
Schmieden, H
Schoch, B
Suft, G
机构：
[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany
[2] Petersburg Nucl Phys Inst, St Petersburg 188350, Russia
[3] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany
[4] Univ Bonn, Inst Phys, D-53115 Bonn, Germany
[5] Univ Groningen, Kernfys Versneller Inst, NL-9747 AA Groningen, Netherlands
[6] Ruhr Univ Bochum, Inst Expt Phys 1, D-44780 Bochum, Germany
[7] Univ Dresden, Inst Kern & Teilchenphys, D-01069 Dresden, Germany
[8] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland
[9] Univ Giessen, Inst Phys 2, D-35392 Giessen, Germany
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 01期
关键词：
D O I：
10.1103/PhysRevLett.94.012004
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Total and differential cross sections for the reaction p(gamma,eta)p have been measured for photon energies in the range from 750 MeV to 3 GeV. The low-energy data are dominated by the S-11 wave which has two poles in the energy region below 2 GeV. Eleven nucleon resonances are observed in their decay into peta. At medium energies we find evidence for a new resonance N(2070)D-15 with (M,Gamma)=(2068+/-22, 295+/-40) MeV. At gamma energies above 1.5 GeV, a strong peak in the forward direction develops, signaling the exchange of vector mesons in the t channel.
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页数：5
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