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arXiv 0811.4212nucl-th
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手征夸克模型中低能$K^-p\to Σ^0π^0$反应

The $K^-p\to Σ^0π^0$ reaction at low energies in a chiral quark model

Xian-Hui Zhong, Qiang Zhao

摘要:

将手征夸克模型方法推广到低能$\bar{K}N$散射的研究中。研究了中心质量能量为$P_K\lesssim 800$ MeV/c(即$W\lesssim 1.7$ GeV)的$K^-p\to Σ^0π^0$过程.这种方法是成功的,在描述的微分截面和总截面的作用,低位$Λ$共振$n=1$壳澄清。$Λ(1405)S_{01}$在这里考虑的能量区域内主导反应。在$P_K\simeq 400$ MeV/c附近,$Λ(1520)D_{03}$负责横截面中的强共振峰。$Λ(1670)S_{01}$在$P_K=750$ MeV/c附近有明显的贡献,而$Λ(1690)D_{03}$的贡献在此能量区域不太重要。非共振背景贡献,即$u$ -通道和$t$ -通道,在解释由于振幅干扰引起的角分布中也起重要作用。

英文摘要:

A chiral quark-model approach is extended to the study of the $\bar{K}N$ scattering at low energies. The process of $K^-p\to Σ^0π^0$ at $P_K\lesssim 800$ MeV/c (i.e. the center mass energy $W\lesssim 1.7$ GeV) is investigated. This approach is successful in describing the differential cross sections and total cross section with the roles of the low-lying $Λ$ resonances in $n=1$ shells clarified. The $Λ(1405)S_{01}$ dominates the reactions over the energy region considered here. Around $P_K\simeq 400$ MeV/c, the $Λ(1520)D_{03}$ is responsible for a strong resonant peak in the cross section. The $Λ(1670)S_{01}$ has obvious contributions around $P_K=750$ MeV/c, while the contribution of $Λ(1690)D_{03}$ is less important in this energy region. The non-resonant background contributions, i.e. $u$-channel and $t$-channel, also play important roles in the explanation of the angular distributions due to amplitude interferences.

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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