First measurement of the Λ–Ξ interaction in proton–proton collisions at the LHC
First measurement of the Λ–Ξ interaction in proton–proton collisions at the LHC
复制标题
DOI：
10.1016/j.physletb.2022.137223
复制
发表时间：
2022-04
影响因子：
4.4
通讯作者：
Alice Collaboration
中科院分区：
文献类型：
--
作者：
Alice Collaboration
在这封信中给出了关于Λ和Λ −奇异重子之间强相互作用的第一个实验信息。在LHC上测量了在s= 13 TeV的高多重数质子-质子（pp）碰撞中产生的Λ-π −和Λ-π-π +对的相关函数，它们是相对动量的函数。的femtoscopy方法被用来计算的相关函数，然后与理论预期使用介子交换模型，手征有效场理论，晶格QCD计算接近物理点。数据支持小散射参数的预测，而丢弃大散射参数的版本，因此表明弱的Λ-π −相互作用。数据的统计意义有限，尚不能限制耦合通道（如Ω-Ω和N-Ω）的影响。
The first experimental information on the strong interaction between Λ and Ξ− strange baryons is presented in this Letter. The correlation function of Λ–Ξ− and Λ‾–Ξ‾+ pairs produced in high-multiplicity proton–proton (pp) collisions at s= 13 TeV at the LHC is measured as a function of the relative momentum of the pair. The femtoscopy method is used to calculate the correlation function, which is then compared with theoretical expectations obtained using a meson exchange model, chiral effective field theory, and Lattice QCD calculations close to the physical point. Data support predictions of small scattering parameters while discarding versions with large ones, thus suggesting a weak Λ–Ξ− interaction. The limited statistical significance of the data does not yet allow one to constrain the effects of coupled channels like Σ–Ξ and N–Ω.