Deep Exclusive Electroproduction of π0 at High Q2 in the Quark Valence Regime
Deep Exclusive Electroproduction of π0 at High Q2 in the Quark Valence Regime
复制标题
在夸克价态中高 Q2 深度独家电生产 Ï0
DOI：
10.1103/physrevlett.127.152301
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发表时间：
2021
影响因子：
8.6
通讯作者：
Adikaram, D.
中科院分区：
文献类型：
--
作者：
Dlamini, M.;Karki, B.;Ali, S. F.;Lin, P-J.;Georges, F.;Ko, H-S;Israel, N.;Rashad, M. N. H.;Stefanko, A.;Adikaram, D.
我们报告了在（0.36,0.48和0.60）和（3.1 to）的大值下质子的独占中性介子电产横截面的测量结果，这些测量结果来自Jefferson实验室Hall A实验E12-06-014。相应的结构函数是作为质子动量转移的函数提取出来的。结果表明，横向偏振虚光子的振幅在整个运动范围内继续主导横截面。基于横向广义部分子分布与介子的螺旋翻转分布振幅耦合的计算很好地描述了这些数据，从而为探测核子的结构提供了一种独特的方法。
We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of(0.36, 0.48, and 0.60) and(3.1 to) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions,,, andare extracted as a function of the proton momentum transfer. The results suggest the amplitude for transversely polarized virtual photons continues to dominate the cross section throughout this kinematic range. The data are well described by calculations based on transversity generalized parton distributions coupled to a helicity flip distribution amplitude of the pion, thus providing a unique way to probe the structure of the nucleon.