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arXiv 1406.4685nucl-thhep-ph
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~ 3 He和中子广义部分子分布的相干深虚康普顿散射

Coherent deeply virtual Compton scattering off 3He and neutron generalized parton distributions

Matteo Rinaldi, Sergio Scopetta

摘要:

最近有人提出研究~ 3 He核的相干深虚康普顿散射(DVCS)来获得中子广义部分子分布(GPD)。特别是,它已被证明,在脉冲近似(IA)和低动量转移,夸克螺旋守恒的GPD的3 He,H和E的总和,是由中子的贡献占主导地位。这个特殊的结果使得3 He靶非常有希望获得中子信息。本文介绍了~ 3 He自旋相关GPD代字-H的IA计算。此外,对于这个量的中子的贡献被发现是占主导地位的,在低动量转移。正确地恢复了波浪线-H IA计算的已知前向极限,得到了3 He的极化部分子分布。中子信息的提取无论如何都是不平凡的,因此提出了一种能够考虑IA分析中编码的核效应的程序。这些计算,必不可少的一致DVCS截面的不对称性,这取决于GPD的H,E和波浪-H的评估,代表了一个关键的一步,计划可能的实验在杰斐逊实验室。

英文摘要:

It has been recently proposed to study coherent deeply virtual Compton scattering (DVCS) off 3He nuclei to access neutron generalized parton distributions (GPDs). In particular, it has been shown that, in Impulse Approximation (IA) and at low momentum transfer, the sum of the quark helicity conserving GPDs of 3He, H and E, is dominated by the neutron contribution. This peculiar result makes the 3He target very promising to access the neutron information. We present here the IA calculation of the spin dependent GPD tilde-H of 3He. Also for this quantity the neutron contribution is found to be the dominant one, at low momentum transfer. The known forward limit of the IA calculation of tilde-H, yielding the polarized parton distributions of 3He, is correctly recovered. The extraction of the neutron information could be anyway non trivial, so that a procedure, able to take into account the nuclear effects encoded in the IA analysis, is proposed. These calculations, essential for the evaluation of the coherent DVCS cross section asymmetries, which depend on the GPDs H, E and tilde-H, represent a crucial step for planning possible experiments at Jefferson Lab.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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