Survival of back-to-back correlations for finite expanding fireballs
Survival of back-to-back correlations for finite expanding fireballs
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DOI：
10.1016/j.nuclphysa.2006.06.098
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发表时间：
2005-10
期刊：
影响因子：
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通讯作者：
S. Padula;Y. Hama;G. Krein;P. K. Panda;T. Csorgo
中科院分区：
文献类型：
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作者：
S. Padula;Y. Hama;G. Krein;P. K. Panda;T. Csorgo
如果在高能核-核碰撞中形成热而致密的强子物质，则预言会出现粒子-反粒子对的背靠背关联（BBC）。BBC关联与介质中的质量修正和量子压缩有关。在玻色子（bBBC）和费米子（fBBC）的情况下，形式是类似的。bBBC和fBBC都是强度相似的正相关和无限相关。为了测试在更现实的情况下的生存和强度的影响，我们研究了背靠背的相关性发生在一个有限大小的，热化介质的质量修改。为了说明，我们考虑一个非相对论膨胀火球有限的发射时间。我们表明，BBC信号确实生存的膨胀和流动的影响，在RHIC观察到足够的幅度。
Back-to-Back Correlations (BBC) of particle-antiparticle pairs are predicted to appear if hot and dense hadronic matter is formed in high energy nucleus-nucleus collisions. The BBC correlations are related to in-medium mass-modification and squeezing of the quanta involved. The formalisms are analogous in the bosonic (bBBC) and in the fermionic (fBBC) cases. Both the bBBC and the fBBC are positive and unlimited correlations of similar strength. For testing the survival and the intensity of the effect in a more realistic situation, we study the back-to-back correlations for mass-modification occurring in a finite sized, thermalized medium. For illustration, we consider a non-relativistically expanding fireball with finite emission time. We show that the BBC signal indeed survives the expansion and flow effects, with sufficient magnitude to be observed at RHIC.