High-statistics study of the reaction γp → p2π0
High-statistics study of the reaction γp → p2π0
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γp → p2π0 反应的高统计研究
DOI：
10.1140/epja/i2015-15095-x
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
The Cbelsataps Collaboration
中科院分区：
文献类型：
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作者：
V. Sokhoyan;E. Gutz;V. Crede;H. Pee;A. Anisovich;J. Bacelar;B. Bantes;O. Bartholomy;D. Bayadilov;R. Beck;Y. Beloglazov;R. Castelijns;H. Dutz;D. Elsner;R. Ewald;F. Frommberger;M. Fuchs;C. Funke;R. Gregor;A. Gridnev;W. Hillert;P. Hoffmeister;I. Horn;I. Jaegle;J. Junkersfeld;H. Kalinowsky;S. Kammer;V. Kleber;F. Klein;F. Klein;E. Klempt;M. Kotulla;B. Krusche;M. Lang;H. Löhner;I. Lopatin;S. Lugert;T. Mertens;J. Messchendorp;V. Metag;B. Metsch;M. Nanova;V. Nikonov;D. Novinsky;R. Novotný;M. Ostrick;L. Pant;M. Pfeiffer;D. Piontek;A. Roy;A. Sarantsev;C. Schmidt;H. Schmieden;T. Seifen;S. Shende;A. Süle;V. Sumachev;T. Szczepanek;A. Thiel;U. Thoma;D. Trnka;R. Varma;D. Walther;C. Wendel;A. Wilson;The Cbelsataps Collaboration
在德国波恩电子加速器艾尔莎的晶体桶/TAPS实验上，研究了质子光生2π0介子的过程。辐射器中产生的光子的能量被标记在从600 MeV到2.5 GeV的能量范围内。给出了微分截面、总截面和pπ0π0 Dalitz图。部分数据是用产生线性偏振光子的金刚石辐射器拍摄的，并导出了光束的不对称性。利用Bonn-Gatchina（BnGa）分波分析确定了pπ0π0末态的核子和Δ共振的性质.本文给出的数据使我们能够确定核子和Δ共振通过几个中间态衰变到pπ0π0的分支比。最突出的是通过Δ（1232）π、N（1440）1/2+π、N（1520）3/2−π、N（1680）5/2+π进行的衰变，但也有pf 0（500）、pf 0（980）和pf 2（1270）参与反应。
The photoproduction of 2π0 mesons off protons was studied with the Crystal Barrel/TAPS experiment at the electron accelerator ELSA in Bonn. The energy of photons produced in a radiator was tagged in the energy range from 600 MeV to 2.5 GeV. Differential and total cross sections and pπ0π0 Dalitz plots are presented. Part of the data was taken with a diamond radiator producing linearly polarized photons, and beam asymmetries were derived. Properties of nucleon and Δ resonances contributing to the pπ0π0 final state were determined within the Bonn-Gatchina (BnGa) partial-wave analysis. The data presented here allow us to determine branching ratios of nucleon and Δ resonances for their decays into pπ0π0 via several intermediate states. Most prominent are decays proceeding via Δ(1232)π, N(1440)1/2+π, N(1520)3/2−π, N(1680)5/2+π, but also pf0(500), pf0(980), and pf2(1270) contribute to the reaction.