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Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India.
Nuclear Physics Institute of the Czech Academy of Sciences, Řež u Prahy, Czech Republic.
Phys Rev Lett. 2020 Mar 6;124(9):092301. doi: 10.1103/PhysRevLett.124.092301.
The study of the strength and behavior of the antikaon-nucleon (K[over ¯]N) interaction constitutes one of the key focuses of the strangeness sector in low-energy quantum chromodynamics (QCD). In this Letter a unique high-precision measurement of the strong interaction between kaons and protons, close and above the kinematic threshold, is presented. The femtoscopic measurements of the correlation function at low pair-frame relative momentum of (K^{+}p⊕K^{-}p[over ¯]) and (K^{-}p⊕K^{+}p[over ¯]) pairs measured in pp collisions at sqrt[s]=5, 7, and 13 TeV are reported. A structure observed around a relative momentum of 58 MeV/c in the measured correlation function of (K^{-}p⊕K^{+}p[over ¯]) with a significance of 4.4σ constitutes the first experimental evidence for the opening of the (K[over ¯]^{0}n⊕K^{0}n[over ¯]) isospin breaking channel due to the mass difference between charged and neutral kaons. The measured correlation functions have been compared to Jülich and Kyoto models in addition to the Coulomb potential. The high-precision data at low relative momenta presented in this work prove femtoscopy to be a powerful complementary tool to scattering experiments and provide new constraints above the K[over ¯]N threshold for low-energy QCD chiral models.
反K介子-核子（K̄N）相互作用的强度和行为研究是低能量子色动力学（QCD）中奇异数领域的关键研究重点之一。在本快报中，展示了对接近并高于运动学阈值的K介子与质子之间强相互作用的独特高精度测量。报告了在质心能量√s = 5、7和13 TeV的质子-质子碰撞中，对（K⁺p⊕K⁻p̄）和（K⁻p⊕K⁺p̄）对在低对撞框架相对动量下的关联函数进行的飞米尺度测量。在（K⁻p⊕K⁺p̄）的测量关联函数中，在相对动量约58 MeV/c处观察到一个结构，显著性为4.4σ，这是由于带电和中性K介子质量差异导致（K̄⁰n⊕K⁰n̄）同位旋破缺通道开启的首个实验证据。除了库仑势之外，还将测量的关联函数与于利希模型和京都模型进行了比较。本工作中给出的低相对动量下的高精度数据证明，飞米尺度测量是散射实验的有力补充工具，并为低能QCD手征模型在K̄N阈值以上提供了新的约束。
