Double polarisation observable G for single pion photoproduction from the proton
Double polarisation observable G for single pion photoproduction from the proton
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双偏振可观测 G 用于质子的单介子照片制作
DOI：
10.1016/j.physletb.2021.136304
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发表时间：
2021
影响因子：
4.4
通讯作者：
Adhikari, K.P.
中科院分区：
文献类型：
--
作者：
Zachariou, N.;Watts, D.P.;McAndrew, J.;Zana, L.;Bashkanov, M.;Strakovsky, I.I.;Workman, R.;Sarantsev, A.V.;Nikonov, V.;Adhikari, K.P.
报道了用能量标记为(0.73-2.3GeV)的线极化光子束测量纵向自旋极化质子产生π+和π0介子的实验结果。杰斐逊实验室的CEBAF大接受光谱仪为反应产物提供了几乎完全的立体角覆盖。从数据的最大似然拟合中提取了双极化可观测G，使得能够第一次准确地确定反应γ→p→→π+n，同时还显著扩展了γ→p→→π0 p的运动学覆盖。这个庞大的数据集为在质量范围从1.4GeV到2.2GeV的范围内衰变到Nπ的激发核子态的性质和光谱以及背景(非共振)光产生过程提供了重要的约束。在实施我们的数据后，在Said和Bonn-GatChina方法中对可观测G的描述取得了相当大的改进，说明分波分析现在显著地扩展了关于W>；1.8GeV处Nπ光生振幅的知识。使用新的高精度数据集进行分波分析对高自旋核子激发态的提取性质有很大影响。
We report measurements of π+ and π 0 meson photoproduction from longitudinally spin-polarised protons by an energy tagged (0.73-2.3 GeV) and linearly polarised photon beam. A close to complete solid angle coverage for the reaction products was provided by the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The double-polarisation observable G is extracted from Maximum Likelihood fits to the data, enabling the first accurate determination for the reaction γ→ p→→ π+ n, while also significantly extending the kinematic coverage for γ→ p→→ π 0 p. This large data set provides an important constraint on the properties and spectrum of excited nucleon states decaying to Nπ in the mass range from 1.4 to 2.2 GeV, as well as for background (non-resonant) photoproduction processes. The considerable improvement achieved in the description of the observable G within the SAID and Bonn-Gatchina approaches after implementation of our data, illustrates that the partial-wave analyses now significantly extend the knowledge on Nπ photoproduction amplitudes at W> 1.8 GeV. A partial-wave analysis using the new high-precision data set has a large impact on the extracted properties of high-spin nucleon excited states.
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γp → p2π0 反应的高统计研究
DOI：
10.1140/epja/i2015-15095-x
发表时间：
2015
期刊：
The European Physical Journal A
影响因子：
--
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
通讯作者：
The Cbelsataps Collaboration
影响因子：
8.6
作者：
R. Koniuk;N. Isgur
通讯作者：
R. Koniuk;N. Isgur
通过双极化测量重新审视成熟的核子共振
影响因子：
8.6
作者：
A. Thiel [CBELSA;TAPS Collaboration]
通讯作者：
TAPS Collaboration]
影响因子：
4.4
作者：
V. Mokeev;V. Burkert;D. Carman;L. Elouadrhiri;E. Golovatch;R. Gothe;K. Hicks;B. Ishkhanov;E. Isupov;K. Joo;N. Markov;E. Pasyuk;A. Trivedi
通讯作者：
V. Mokeev;V. Burkert;D. Carman;L. Elouadrhiri;E. Golovatch;R. Gothe;K. Hicks;B. Ishkhanov;E. Isupov;K. Joo;N. Markov;E. Pasyuk;A. Trivedi
DOI：
10.1140/epja/i2006-10221-7
发表时间：
2006-10
期刊：
The European Physical Journal A
影响因子：
--
作者：
S. Brodsky
通讯作者：
S. Brodsky