压缩粒子-反粒子关联
Squeezed particle-antiparticle correlations
摘要:
一种涉及粒子-反粒子对的新型关联在20世纪90年代被发现。如果强子质量在高能重离子碰撞中形成的热而稠密的介质中发生改变,它们应该存在。虽然理论上已经建立,但这种强子关联还没有在实验中观察到。在这个唯象研究中,我们提出了一种寻找BBC信号的有希望的方法,通过研究RHIC能量下φ φ和K^+ K^-对的压缩关联函数,作为对平均动量的函数,K_{12} =(k_1+k_2)/2。本文还讨论了介质内质量移动对全同粒子关联的影响(Hanbury-Brown和Twiss效应)。
英文摘要:
A novel type of correlation involving particle-antiparticle pairs was found out in the 1990's. Currently known as Squeezed or Back-to-Back Correlations (BBC), they should be present if the hadronic masses are modified in the hot and dense medium formed in high energy heavy ion collisions. Although well-established theoretically, such hadronic correlations have not yet been observed experimentally. In this phenomenological study we suggest a promising way to search for the BBC signal, by looking into the squeezed correlation function of phi phi and K^+ K^- pairs at RHIC energies, as function of the pair average momentum, K_{12}=(k_1+k_2)/2. The effects of in-medium mass-shift on the identical particle correlations (Hanbury-Brown & Twiss effect) are also discussed.
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