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arXiv 0709.0708nucl-th
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中微子-核子反应中π介子的产生

Pion Production in Neutrino-Nucleon Reactions

E. Hernandez, J. Nieves, M. Valverde

摘要:

我们建立了一个核子外弱π介子产生的模型,它除了包含$Δ(1232)$共振的弱激发及其随后衰变为$Nπ$外,还包含了手征对称性所要求的一些背景项.我们重新拟合的$C_5^A(q^2)$形状因子的通量平均$ν_μp \to μ^-pπ^+$ ANL $q^2-$微分截面数据,发现一个大大小于传统的文献中假设的$Δ$极机制的贡献。我们还表明,三角极和背景项之间的干扰产生宇称违反贡献的π角微分截面。

英文摘要:

We construct a model for the weak pion production off the nucleon, which in addition to the weak excitation of the $Δ(1232)$ resonance and its subsequent decay into $Nπ$, it includes also some background terms required by chiral symmetry. We re-fit the $C_5^A(q^2)$ form factor to the flux averaged $ν_μp \to μ^-pπ^+$ ANL $q^2-$differential cross section data, finding a substantially smaller contribution of the $Δ$ pole mechanism than traditionally assumed in the literature. We also show that the interference between the Delta pole and the background terms produces parity-violating contributions to the pion angular 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。

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