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Variable Energy Cyclotron Centre, Homi Bhabha National Institute.
Nuclear Physics Institute of the Czech Academy of Sciences.
Phys Rev Lett. 2021 Oct 22;127(17):172301. doi: 10.1103/PhysRevLett.127.172301.
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 p-ϕ⊕ p[over ¯]-ϕ pairs measured in high-multiplicity pp collisions at sqrt[s]=13 TeV by the ALICE Collaboration. The spin-averaged scattering length and effective range of the p-ϕ 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 p-ϕ interaction. These data demonstrate that the interaction is dominated by elastic p-ϕ scattering. Furthermore, an analysis employing phenomenological Gaussian- and Yukawa-type potentials is conducted. Under the assumption of the latter, the N-ϕ coupling constant is found to be g_{N-ϕ}=0.14±0.03(stat)±0.02(syst). This work provides valuable experimental input to accomplish a self-consistent description of the N-ϕ interaction, which is particularly relevant for the more fundamental studies on partial restoration of chiral symmetry in nuclear medium.
本信函展示了质子与ϕ介子之间吸引性强相互作用的首个实验证据。该结果来自于ALICE合作组在√[s]=13 TeV的高多重数质子-质子碰撞中测量的组合p-ϕ⊕ p[上划线]-ϕ对的两粒子关联。利用Lednický-Lyuboshits方法从完全校正的关联函数中提取了p-ϕ相互作用的自旋平均散射长度和有效范围。特别地，散射长度的虚部在不确定性范围内消失，这表明非弹性过程在p-ϕ相互作用中不占显著地位。这些数据表明该相互作用主要由弹性p-ϕ散射主导。此外，还进行了采用唯象高斯型和汤川型势的分析。在后者的假设下，发现N-ϕ耦合常数为g_{N-ϕ}=0.14±0.03(统计)±0.02(系统)。这项工作为完成对N-ϕ相互作用的自洽描述提供了有价值的实验输入，这对于在核介质中手征对称性部分恢复的更基础研究尤为重要。
