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Experimental Evidence for an Attractivep−ϕInteraction
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-10-20 , DOI: 10.1103/physrevlett.127.172301
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Affiliation  

This Letter presents the first experimental evidence of the attractive strong interaction between a proton and a ϕ meson. The result is obtained from two-particle correlations of combined pϕp¯ϕ pairs measured in high-multiplicity pp collisions at s=13TeV by the ALICE Collaboration. The spin-averaged scattering length and effective range of the pϕ interaction are extracted from the fully corrected correlation function employing the Lednický-Lyuboshits approach. In particular, the imaginary part of the scattering length vanishes within uncertainties, indicating that inelastic processes do not play a prominent role for the pϕ interaction. These data demonstrate that the interaction is dominated by elastic pϕ scattering. Furthermore, an analysis employing phenomenological Gaussian- and Yukawa-type potentials is conducted. Under the assumption of the latter, the Nϕ coupling constant is found to be gNϕ=0.14±0.03(stat)±0.02(syst). This work provides valuable experimental input to accomplish a self-consistent description of the Nϕ interaction, which is particularly relevant for the more fundamental studies on partial restoration of chiral symmetry in nuclear medium.

中文翻译:

有吸引力的 p−ϕInteraction 的实验证据

这封信提供了质子和质子之间有吸引力的强相互作用的第一个实验证据 φ介子。结果是从组合的两粒子相关性中获得的-φ¯-φ 以高多重性测量的对 碰撞在 =13伏特由爱丽丝合作。自旋平均散射长度和有效范围-φ相互作用是从采用 Lednický-Lyuboshits 方法的完全校正的相关函数中提取的。特别是,散射长度的虚部在不确定性内消失,表明非弹性过程对-φ相互作用。这些数据表明相互作用是由弹性支配的-φ散射。此外,还进行了使用现象学高斯和汤川型电位的分析。在后者的假设下,N-φ 发现耦合常数为 GN-φ=0.14±0.03(状态)±0.02(系统). 这项工作提供了有价值的实验输入,以完成对N-φ 相互作用,这与核介质中手性对称性部分恢复的更基础研究特别相关。
更新日期:2021-10-20
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