arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.2699nucl-thhep-ph
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超核的电磁产生

Electromagnetic production of hypernuclei

B. I. S. van der Ventel, T. Mart, H. -F. Lu, H. L. Yadav, G. C. Hillhouse

摘要:

本文发展了超核电磁产生的一种形式,其中的截面可写成轻子张量与强子张量之间的收缩。强子张量是以一种与模型无关的方式写成的,它是用一组五个原子核结构函数展开的。这些结构函数是通过假设虚光子只与一个束缚核子相互作用来计算的。我们使用最近的模型的基本电流算子,给出了一个很好的描述相应的基本过程的实验数据。在相对论平均场模型下计算了束缚核子和超子的束缚态波函数。计算了超核产生过程e +12 C--> e + K+ +12 λ {B}的非极化三重微分截面随K介子散射角的变化.原子核结构函数是在粒子-空穴模型中计算的。的截面显示的特征形式是大的小值的K介子散射角与平滑的下降到零,随着角度的增加。横截面的形状基本上由原子核结构函数决定。此外,还发现对于非极化的三重微分截面,在整个K介子散射角范围内,一个结构函数是可以忽略的。

英文摘要:

A formalism for the electromagnetic production of hypernuclei is developed where the cross section is written as a contraction between a leptonic tensor and a hadronic tensor. The hadronic tensor is written in a model-independent way by expanding it in terms of a set of five nuclear structure functions. These structure functions are calculated by assuming that the virtual photon interacts with only one bound nucleon. We use the most recent model for the elementary current operator which gives a good description of the experimental data for the corresponding elementary process. The bound state wave functions for the bound nucleon and hyperon are calculated within a relativistic mean-field model. We calculate the unpolarized triple differential cross section for the hypernuclear production process e + 12C --> e + K+ + 12_Lambda{B} as a function of the kaon scattering angle. The nuclear structure functions are calculated within a particle-hole model. The cross section displays a characteristic form of being large for small values of the kaon scattering angle with a smooth fall-off to zero with increasing angle. The shape of the cross section is essentially determined by the nuclear structure functions. In addition, it is found that for the unpolarized triple differential cross section one structure function is negligible over the entire range of the kaon scattering angle.

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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