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arXiv 0906.1935hep-ph
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用另一重子流方法计算$Λ$和$Σ$重子的电磁形状因子

Electromagnetic form factors of the $Λ$ and $Σ$ baryons in an alternative baryonic current approach

Yong-Lu Liu, Ming-Qiu Huang

摘要:

利用光锥求和定则,采用Ioffe型内插电流,研究了$Λ$和$Σ$重子的电磁形状因子.求和规则在一定程度上受来自比较的内插电流的选择的影响。数值计算表明,磁形状因子可以很好地拟合$Σ$的偶极子公式,但不适用于$Λ$。磁形状因子的$Λ$接近零的动量传递快于偶极子公式估计。

英文摘要:

Light-cone sum rules are used to investigate the electromagnetic form factors of the $Λ$ and $Σ$ baryons by using the Ioffe type interpolating currents. The sum rules are affected to some extent by the choice of the interpolating currents from a comparison. Numerical calculations show that the magnetic form factor can be well fitted by the dipole formula for $Σ$ but not for $Λ$. The magnetic form factor of $Λ$ approaches zero with the momentum transfer faster than the dipole formula estimation.

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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