arXiv 2204.102582022-04nucl-exhep-ex

LHC质子-质子碰撞中$Λ$-$Ξ$相互作用的首次测量

First measurement of the $Λ$-$Ξ$ interaction in proton-proton collisions at the LHC

ALICE Collaboration

备注：: 19 pages, 2 captioned figures, 1 table, authors from page 14, published version, figures at http://alice-publications.web.cern.ch/node/7850
发表信息：: Phys. Lett. B 844 (2023) 137223
DOI：: 10.1016/j.physletb.2022.137223

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AI总结：

本研究利用LHC高多重数pp碰撞中的$Λ-Ξ^-$及反粒子对飞秒关联测量，首次实验约束$Λ$-$Ξ$强相互作用，支持弱相互作用和小散射参数。

摘要：

本快报给出了关于$Λ$与$Ξ^-$奇异重子之间强相互作用的首个实验信息。在LHC上质心系能量$\sqrt{s}=13$ TeV的高多重数质子-质子（pp）碰撞中，测量了所产生的$Λ-Ξ^-$和$\overlineΛ-\overlineΞ^{+}$粒子对的关联函数随粒子对相对动量的变化。采用飞秒镜（femtoscopy）方法计算关联函数，随后将其与利用介子交换模型、手征有效场论以及接近物理点的Lattice QCD计算所得的理论预期进行比较。数据支持小散射参数的预言，而排除了具有大散射参数的版本，从而表明$Λ-Ξ^-$相互作用较弱。数据有限的统计显著性尚不足以约束$Σ-Ξ$和N$-Ω$等耦合道的效应。

英文摘要：

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 $\overlineΛ-\overlineΞ^{+}$ pairs produced in high-multiplicity proton-proton (pp) collisions at $\sqrt{s}$ = 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$-Ω$.

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