arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.4184hep-ph
收藏

低能中微子诱导核子外弱π介子产生和核内相干π介子产生

Neutrino induced weak pion production off the nucleon and coherent pion production in nuclei at low energies

J. E. Amaro, E. Hernández, J. Nieves, M. Valverde, M. J. Vicente-Vacas

备注：
Talk given at the NUINT09 Conference. 6 latex pages, 4 figures
发表信息：
AIP Conf.Proc.1189:224-229,2009
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

为了计算核中的相干π介子产生，我们提出了一个中微子诱导的核子外单π介子产生的微观模型及其实现。我们进一步批评使用的Rein-Sehgal模型的相干π介子生产的低能中微子。特别是，我们展示了如何在该模型中的近似引起一个更平坦的微分截面的$η=E_π(1-\cosθ_π)$变量。我们讨论了固有的局限性，任何方法的基础上的轴向电流假设的部分守恒和这种模型无法正确地确定角分布的出射π介子相对于入射中微子的方向。我们显示的情况下的$\frac{dσ}{dη}$差分截面的这些限制的影响。

英文摘要：

We present a microscopic model for neutrino induced one-pion production off the nucleon and its implementation for the purpose of calculating coherent pion production in nuclei. We further criticize the use of the Rein--Sehgal model for coherent pion production by low energy neutrinos. In particular, we show how the approximations in that model give rise to a much flatter differential cross section in the $η=E_π(1-\cosθ_π)$ variable. We discuss the limitations intrinsic to any approach based on the partial conservation of the axial current hypothesis and the inability of such models to properly determine the angular distribution of the outgoing pion with respect to the direction of the incoming neutrino. We show the effects of those limitation for the case of the $\frac{dσ}{dη}$ differential cross section.

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。

↑