Photoproduction of η -mesons off protons

被引：0
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作者：
O. Bartholomy
R. Bogendörfer
V. Credé
I. Fabry
A. V. Anisovich
G. Anton
R. Bantes
Y. A. Beloglazov
R. Castelijns
A. Ehmanns
J. Ernst
H. Flemming
A. Fösel
M. Fuchs
Ch. Funke
R. Gothe
A. B. Gridnev
E. Gutz
S. Höffgen
I. Horn
J. Hößl
J. Junkersfeld
H. Kalinowsky
F. Klein
E. Klempt
H. Koch
M. Konrad
B. Kopf
B. Krusche
J. Langheinrich
H. Löhner
I. V. Lopatin
J. Lotz
H. Matthäy
D. Menze
J. Messchendorp
V. A. Nikonov
D. V. Novinski
M. Ostrick
H. van Pee
A. K. Radkov
A. V. Sarantsev
S. Schadmand
C. Schmidt
H. Schmieden
B. Schoch
G. Suft
V. V. Sumachev
T. Szczepanek
U. Thoma
机构：
[1] Universität Bonn,Helmholtz
[2] Universität Erlangen,Institut für Strahlen
[3] Florida State University, und Kernphysik
[4] Petersburg Nuclear Physics Institute,Physikalisches Institut
[5] Universität Bonn,Department of Physics
[6] Kernfysisch Versneller Instituut,Physikalisches Institut
[7] Universität Bochum,Institut für Experimentalphysik I
[8] Universität Basel,Institut für Physik
[9] Universität Gießen,II. Physikalisches Institut
来源：
The European Physical Journal A | 2007年 / 33卷
关键词：
13.30.-a Decays of baryons; 13.60.Le Meson production; 14.20.Gk Baryon resonances with ; = 0 ;
D O I：
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学科分类号：
摘要：
Photoproduction of η -mesons was studied with the Crystal-Barrel detector at ELSA for photon energies in the range from 0.75 to 3GeV. Total and differential cross-sections are presented. The η mesons are detected in two decay modes, in η → 2γ and in η → 3π0 → 6γ . The cross-sections vary slowly as functions of energy and η production angle suggesting that only few resonances make significant contributions to the cross-section. For photon energies above 1.5GeV, the differential cross-sections show a strong forward peak due to meson exchanges in the t channel. A comparison of the η -photoproduction cross-sections with SAID and MAID as well as with a partial-wave analysis performed on our data in combination with other data sets shows good agreement. The Bonn-Gatchina partial-wave analysis suggests that the largest contribution to η photoproduction for energies below 3GeV proceeds via three resonances, the well-known N(1535)S11 , via N(1720)P13 , and a newly suggested N(2070)D15 .
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页码：133 / 146
页数：13
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