论文标题
阈值$π^ - 中子上的$ photoduduction
Threshold $π^-$ Photoproduction on the Neutron
论文作者
论文摘要
Pions $@$ Max-Lab合作的最新数据，测量了触发不一致的光生效的总横截面$γd\toπ^-pp $接近阈值，用于提取E $ _ {0+} $多物和反应$γn\！\！f \！thresh的反应$γn\！这些是阈值区域中反应$γd\toπ^-pp $的第一个测量。 E $ _ {0+} $的值是通过拟合在光增生模型中的Deuteron数据中提取的，该模型占最终状态相互作用。该模型对基本反应的$ S $ - 波近似$γn\！\ to \！π^-p $带有e $ _ {0+} \！ =阈值区域中的$ const。获得的值e $ _ {0+} = -31.86 \ pm 0.8 $（以$ 10^{ - 3}/m_ {π^+} $ units）与其他现有结果一致。还给出了总截面$σ（γn\！\ to \！π^-p）$的模型预测。
Recent data from the PIONS$@$MAX-lab Collaboration, measuring the total cross section of the pion incoherent photoproduction $γd\toπ^-pp$ near threshold, have been used to extract the E$_{0+}$ multipole and total cross section of the reaction $γn\!\to\!π^-p$, also near threshold. These are the first measurements of the reaction $γd\toπ^-pp$ in the threshold region. The value of E$_{0+}$ is extracted through a fit to the deuteron data in a photoproduction model accounting for final-state interactions. The model takes an $S$-wave approximation for the elementary reaction $γn\!\to\!π^-p$ with E$_{0+}\! = $ const in the threshold region. The obtained value E$_{0+} = -31.86\pm 0.8$ (in $10^{-3}/m_{π^+}$ units) is in agreement with other existing results. Model predictions for the total cross section $σ(γn\!\to\!π^-p)$ are also given.
