超高能cosmic ray碰撞产生介质的全局特性
Global characteristics of the medium produced in ultra-high energy cosmic ray collisions
摘要：
本文给出了超高能宇宙线（UHECR）粒子与各种类型碰撞产生的物质的几何参数和体参数的估计。讨论了小碰撞系统和大碰撞系统中快度、退耦时间和能量密度的多重数密度结果。基于前面提出的解析函数，得到了UHECR能量下各种粒子碰撞产生的发射区的一系列时空量的估计。空间粒子密度在冻结的派生也允许的可能性，如玻色-爱因斯坦凝聚至少与UHECR粒子的核相互作用的二次粒子生产的新功能。得到的全球和几何参数的估计表明，即使在UHECR能量的轻核碰撞中，也会产生具有足够大体积和寿命的退禁闭夸克胶子物质。这些定量结果对未来质心能区对撞机实验和改进超高能宇宙线级联发展唯象模型具有重要意义。
英文摘要：
Estimations of some geometrical and bulk parameters are presented for the matter produced in various type collisions with ultra-high energy cosmic ray (UHECR) particles. Results for multiplicity density at midrapidity, decoupling time, and energy density are discussed for small and larger collision systems. Based on the analytic functions suggested previously elsewhere, estimations for a wide set of space-time quantities are obtained for emission region created in various particle collisions at energies of UHECR. The space particle densities at freeze-out are derived also and allow the possibility of novel features for secondary particle production like Bose-Einstein condensation at least for nuclear interactions with UHECR particles. The estimations obtained for global and geometrical parameters indicate the creation of deconfined quark-gluon matter with large enough volume and lifetime even in light nuclear collisions at UHECR energies. These quantitative results can be important for both the future collider experiments at center-of-mass energy frontier and the improvement of the phenomenological models for development of the cosmic ray cascades in ultra-high energy domain.
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