Helicity Asymmetry E in (γ)over-right-arrow (p)over-right-arrow → π+ n with FROST

被引：2
|
作者：
Strauch, Steffen [1 ]
机构：
[1] Univ S Carolina, Columbia, SC 29208 USA
来源：
8TH INTERNATIONAL WORKSHOP ON THE PHYSICS OF EXCITED NUCLEONS (NSTAR 2011) | 2012年 / 1432卷
关键词：
Meson production; Photoproduction reactions; Polarization in interactions and scattering; Partial-wave analysis; PHOTOPRODUCTION; BREMSSTRAHLUNG; PHOTON;
D O I：
10.1063/1.3701231
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The main objective of the FROST experiment at Jefferson Lab is the study of baryon resonances. The polarization observable E for the reaction (gamma) over right arrow (p) over right arrow -> pi(+) n has been measured as part of this program. A circularly polarized tagged photon beam with energies from 0.35 to 2.35 GeV was incident on a longitudinally polarized frozen-spin butanol target. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer. Preliminary polarization data agree fairly well with present SAID and MAID partial-wave analyses at low photon energies. In most of the covered energy range, however, significant deviations are observed. These discrepancies underline the crucial importance of polarization observables to further constrain these analyses.
引用
收藏
页码：283 / 286
页数：4
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