用飞秒关联测量奇异重子-反重子相互作用
Measurement of strange baryon-antibaryon interactions with femtoscopic correlations
摘要：
用ALICE探测器测量了在$\sqrt{s_{\rm NN}}=2.76$ TeV和$\sqrt{s_{\rm NN}}=5.02$ TeV下Pb-Pb碰撞中$\rm p\overline{p}$、$\rm p\overlineΛ$、$\rm \overline{p}Λ$和$Λ\overlineΛ$对的两粒子关联函数。从一个同时适合所有获得的关联函数，散射长度的实部和虚部，以及有效范围，提取组合$\rm p\overlineΛ$和$\rm \overline{p}Λ$对，并首次为$Λ\overlineΛ$对。有效的平均散射参数较重的重子反重子对，不直接测量，也提供了。结果表明，测量的重子-反重子对之间存在类似的强相互作用，表明它们在相同的相对动量$k^{*}$下以相同的方式湮灭。此外，报告显着的非零虚部和负实部的散射长度为未来的重子-反重子束缚态搜索提供了动力。
英文摘要：
Two-particle correlation functions were measured for $\rm p\overline{p}$, $\rm p\overlineΛ$, $\rm \overline{p}Λ$, and $Λ\overlineΛ$ pairs in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV and $\sqrt{s_{\rm NN}}=5.02$ TeV recorded by the ALICE detector. From a simultaneous fit to all obtained correlation functions, real and imaginary components of the scattering lengths, as well as the effective ranges, were extracted for combined $\rm p\overlineΛ$ and $\rm \overline{p}Λ$ pairs and, for the first time, for $Λ\overlineΛ$ pairs. Effective averaged scattering parameters for heavier baryon-antibaryon pairs, not measured directly, are also provided. The results reveal similarly strong interaction between measured baryon-antibaryon pairs, suggesting that they all annihilate in the same manner at the same pair relative momentum $k^{*}$. Moreover, the reported significant non-zero imaginary part and negative real part of the scattering length provide motivation for future baryon-antibaryon bound state searches.
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