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arXiv 1201.6549nucl-thhep-ph
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手征SU(3)改进阈值约束下的反K介子-核子相互作用理论

Chiral SU(3) theory of antikaon-nucleon interactions with improved threshold constraints

Yoichi Ikeda, Tetsuo Hyodo, Wolfram Weise

摘要:

基于次领先阶手征SU(3)介子-重子有效拉格朗日量,在耦合道动力学框架下研究了$\bar{K}$ -核子相互作用.最近对K介子氢的1 s位移和宽度的测定使我们能够对奇异度$S=-1$扇区中的耦合通道介子-重子振幅设置精确的约束。在阈下外推的耦合通道振幅的理论不确定性进行了讨论。使用这个框架,我们给出的预测$K^-$ -中子相互作用和$Λ(1405)$共振的频谱。为了便于应用于$\bar{K}$ -核少体计算,我们还构造了一个简化的、有效的、考虑首阶手征SU(3)介子-重子相互作用的三通道模型.

英文摘要:

$\bar{K}$-nucleon interactions are investigated in the framework of coupled-channels dynamics based on the next-to-leading order chiral SU(3) meson-baryon effective Lagrangian. A recent determination of the 1s shift and width of kaonic hydrogen enables us to set accurate constraints on the coupled-channels meson-baryon amplitudes in the strangeness $S=-1$ sector. Theoretical uncertainties in the subthreshold extrapolation of the coupled-channels amplitudes are discussed. Using this framework, we give predictions for $K^-$-neutron interactions and for the spectrum of the $Λ(1405)$ resonance. A simplified, effective three-channel model using leading order chiral SU(3) meson-baryon interactions is also constructed for convenient application in $\bar{K}$-nuclear few-body calculations.

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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