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arXiv 0903.4322nucl-th
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重离子碰撞中的催化φ介子产生

Catalytic phi meson production in heavy-ion collisions

E. E. Kolomeitsev, B. Tomasik

摘要:

在核-核碰撞中,在超子π Y -> phi Y和反K介子bar-KN-> phi Y上的phi介子产生是一种新的有效的phi介子源.与入口通道中具有非奇异粒子的过程相反,根据Okubo-Zweig-Izuka规则,这些反应不被抑制,pi B和BB,其中B=N,Delta。在一个简单的强子模型中对截面的粗略估计表明,π-> φ-Y反应和bar-KN-> φ-Y反应的截面可以分别超过π-> φ-N反应的50倍和60倍。在SIS和较低AGS能区核-核碰撞的强子化学模型中,我们计算了新过程引起的奇异粒子布居和φ介子产生率的演化。发现当核-核碰撞的最高温度大于130 MeV,碰撞时间大于10 μ m时,催化反应是可行的。讨论了催化反应对AGS能量下的φ产额和SPS能量下的φ快度分布的中心性依赖性的可能影响。

英文摘要:

The phi meson production on hyperons, pi Y --> phi Y and anti-kaons bar-K N--> phi Y is argued to be a new efficient source of phi mesons in a nucleus-nucleus collision. These reactions are not suppressed according to Okubo-Zweig-Izuka rule in contrast to the processes with non-strange particles in the entrance channels, pi B and BB with B=N,Delta. A rough estimate of the cross sections within a simple hadronic model shows that the cross sections of pi Y-->phi Y and bar-K N-->phi Y reactions can exceed that of the pi N--> phi N reaction by factors 50 and 60, respectively. In the hadrochemical model for nucleus-nucleus collisions at SIS and lower AGS energies we calculate the evolution of strange particle populations and phi meson production rate due to the new processes. It is found that the catalytic reactions can be operative if the maximal temperature in nucleus-nucleus collisions is larger than 130 MeV and the collision time is larger than 10 fm. A possible influence of the catalytic reactions on the centrality dependence of the phi yield at AGS energies and the phi rapidity distributions at SPS energies is discussed.

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