论文标题
对Gerasimov-Drell-Heard-Hearn和规则的高能贡献的测量
Measurement of the high-energy contribution to the Gerasimov-Drell-Hearn sum rule
论文作者
论文摘要
我们建议衡量质子和中子的Gerasimov-Drell-Hersn（GDH）总和规则的高能行为，高达12 GEV。 GDH积分的收敛性将首次研究和高精度。中子上GDH总规则的有效性将首次准确测试，而对于质子，不确定性将提高$ 25 \％$相对。数据将允许对极化域中的regge现象学进行精确测试。 $ a_1 $和$ f_1 $ regge轨迹截距将获得比当前最佳估计值高的数量级。数据还将有助于确定自旋依赖性康普顿振幅的真实和虚构部分，对氢的超精细分裂的极化校正以及研究极化dis和衍射状态之间的过渡。 该实验将需要一个圆形极化光子束（由纵向极化电子束产生），该光束具有大约1/3的Gluex-II实验E12-13-003的通量。该实验将以两种需要两个不同的cebaf束能量进行运行。 D厅将需要一个新的纵向极化质子和Deuteron目标。实验将需要21天的cebaf能量，而在标称的1/3至1/2的能量时，将需要21天的PAC天。
We propose to measure the high-energy behavior of the integrand of the Gerasimov-Drell-Hearn (GDH) sum rule on the proton and the neutron up to 12 GeV. The convergence of the GDH integral will be investigated for the first time and to high precision. The validity of the GDH sum rule on the neutron will be accurately tested for the first time, while for the proton the uncertainty will be improved by $25\%$ relative. The data will allow precision testing of Regge phenomenology in the polarized domain. The $a_1$ and $f_1$ Regge trajectory intercepts will be obtained to an order of magnitude higher precision than the current best estimates. The data will also contribute to the determination of the real and imaginary parts of the spin-dependent Compton amplitude, the polarizability correction to hyperfine splitting in hydrogen, and to studying the transition between polarized DIS and diffractive regimes. The experiment will require a circularly polarized photon beam (produced from a longitudinally polarized electron beam) with a flux approximately 1/3 of the GlueX-II experiment E12-13-003. The experiment will run in two configurations which require two different CEBAF beam energies. A new longitudinal polarized proton and deuteron target will be needed in Hall D. The experiment will require 21 PAC days at the nominal CEBAF energy and another 12 PAC days at an energy 1/3 to 1/2 of the nominal.
