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arXiv 0903.5285hep-phhep-exnucl-th
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中微子诱导的核外相干π介子产生和PCAC

Neutrino Induced Coherent Pion Production off Nuclei and PCAC

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

摘要:

我们回顾了Rein-Sehgal模型,并批评了它在低能中微子诱导相干π介子产生中的应用。我们已经研究了隐含在该模型中的主要近似的有效性,试图在可能的情况下与物理观测值进行比较,并与微观计算进行比较。接下来,我们试图通过删除更有问题的近似来详细说明一个新的改进模型,同时保持模型仍然相当简单。最后,我们讨论了基于轴向电流假设部分守恒的任何方法的固有局限性。特别是,我们已经证明了,除了$q^2= 0$运动学点之外,这种模型无法确定出射π介子相对于入射中微子方向的角分布。

英文摘要:

We review the Rein--Sehgal model and criticize its use for low energy neutrino induced coherent pion production. We have studied the validity of the main approximations implicit in that model, trying to compare with physical observables when that is possible and with microscopical calculations. Next, we have tried to elaborate a new improved model by removing the more problematic approximations, while keeping the model still reasonably simple. Last, we have discussed the limitations intrinsic to any approach based on the partial conservation of the axial current hypothesis. In particular, we have shown the inability of such models to determine the angular distribution of the outgoing pion with respect to the direction of the incoming neutrino, except for the $q^2= 0$ kinematical point.

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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