论文标题
互环抗抗核苷散射的跨通道约束
Cross-channel constraints on resonant antikaon-nucleon scattering
论文作者
论文摘要
手性扰动理论及其单位化版本在我们对低能量强相互作用的理解中起着重要作用。但是，到目前为止，此类研究通常仅处理扰动或非扰动通道。在这封信中，我们报告了第一个全球介绍介子散射到一环秩序的全球研究。结果表明，协变量的重手性扰动理论，包括其负面陌生部门的单位化，可以很好地描述介子 - 巴里昂散射数据。这为QCD的这一重要的低能有效场理论的有效性提供了高度不平凡的检查。我们表明，与低阶研究相比，可以更好地描述$ \ bar {k} n $相关数量，并且由于$πn$和$ k n $相位转移的严格约束，因此不确定性减少了。特别是，我们发现$λ（1405）$的两极结构持续到一环阶，从而加强了动态生成的状态中两极结构的存在。
Chiral perturbation theory and its unitarized versions have played an important role in our understanding of the low-energy strong interaction. Yet, so far, such studies typically deal exclusively with perturbative or nonperturbative channels. In this letter, we report on the first global study of meson-baryon scattering up to one-loop order. It is shown that covariant baryon chiral perturbation theory, including its unitarization for the negative strangeness sector, can describe meson-baryon scattering data remarkably well. This provides a highly non-trivial check on the validity of this important low-energy effective field theory of QCD. We show that the $\bar{K}N$ related quantities can be better described in comparison with those of lower-order studies, and with reduced uncertainties due to the stringent constraints from the $πN$ and $K N$ phase shifts. In particular, we find that the two-pole structure of $Λ(1405)$ persists up to one-loop order reinforcing the existence of two-pole structures in dynamically generated states.
