论文标题
电磁sigma-to-lambda过渡形式因子在类似空间的区域中具有耦合通道效应
The electromagnetic Sigma-to-Lambda transition form factors with coupled-channel effects in the space-like region
论文作者
论文摘要
使用分散理论，电磁sigma-to-lambda过渡形式因子表示为Pion电磁形构想的产物和$σ\barλ\toππ$散射幅度，后者根据su（3）手势触发理论估算了后者，包括baryon decuplet decuplet aS efflepleplet free freefle freefer freefles free。 $ k \ bar {k} $通道的贡献也被考虑在内，$ππ$ - $ k \ bar {k} $耦合通道效应包括两种通道的muskhelishvili-omnès代表。发现在包含$ k \ bar {k} $通道后，电动过渡形式显示出明显的变化，而磁过渡形式仅受到较弱的影响。但是，$ k \ bar {k} $对电动型的效果被三种风味的手性拉格朗日中的未确定耦合$ h_a $遮盖了。 Sigma-to-lambda转变的误差频段是从耦合的不确定性和三种味性手性扰动理论中低能常数的误差带的。
Using dispersion theory, the electromagnetic Sigma-to-Lambda transition form factors are expressed as the product of the pion electromagnetic form factor and the $Σ\barΛ\toππ$ scattering amplitudes with the latter estimated from SU(3) chiral perturbation theory including the baryon decuplet as explicit degrees of freedom. The contribution of the $K\bar{K}$ channel is also taken into account and the $ππ$-$K\bar{K}$ coupled-channel effect is included by means of a two-channel Muskhelishvili-Omnès representation. It is found that the electric transition form factor shows a significant shift after the inclusion of the $K\bar{K}$ channel, while the magnetic transition form factor is only weakly affected. However, the $K\bar{K}$ effect on the electric form factor is obscured by the undetermined coupling $h_A$ in the three-flavor chiral Lagrangian. The error bands of the Sigma-to-Lambda transition form factors from the uncertainties of the couplings and low-energy constant in three-flavor chiral perturbation theory are estimated by a bootstrap sampling method.
