Photoproduction of neutral pion pairs from the proton

被引：0
|
作者：
M. Wolf
J. Ahrens
R. Beck
V. Hejny
J.D. Kellie
M. Kotulla
B. Krusche
V. Kuhr
R. Leukel
V. Metag
J.C. Nacher
R. Novotny
V. Olmos de León
R.O. Owens
F. Rambo
A. Schmidt
M. Schumacher
U. Siodlaczek
H. Ströher
J. Weiß
F. Wissmann
机构：
[1] II. Physikalisches Institut,
[2] Universität Gießen,undefined
[3] D-35392 Gießen,undefined
[4] Germany,undefined
[5] Institut für Kernphysik,undefined
[6] Johannes-Gutenberg-Universität Mainz,undefined
[7] D-55099 Mainz,undefined
[8] Germany,undefined
[9] Department of Physics and Astronomy,undefined
[10] University of Glasgow,undefined
[11] Glasgow G128QQ,undefined
[12] UK,undefined
[13] II. Physikalisches Institut,undefined
[14] Universität Göttingen,undefined
[15] D-37073 Göttingen,undefined
[16] Germany,undefined
[17] Physikalisches Institut,undefined
[18] Universität Tübingen,undefined
[19] D-72076 Tübingen,undefined
[20] Germany,undefined
[21] Departamento de Fısica Teórica and IFIC,undefined
[22] Universidad de Valencia,undefined
[23] 46100 Burjassot,undefined
[24] Spain,undefined
来源：
The European Physical Journal A - Hadrons and Nuclei | 2000年 / 9卷
关键词：
PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions;
D O I：
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学科分类号：
摘要：
Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass analysis. From threshold up to 370 MeV the total cross-section does not exceed 30 nb. For higher energies it shows a smooth rise until it reaches a maximum of about 10 μb at Eγ = 740 MeV. Dalitz plots of m2(π0π0) versusm2(p,π0) for seven bins of incident photon energy have been analysed. For Eγ > 610 MeV, a strong contribution of a sequential decay is observed with the Δ(1232)-resonance as intermediate state. A comparison to model calculations shows that these sequential decays presumably originate from the D13(1520) and also the P11(1440)-resonance.
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页码：5 / 8
页数：3
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