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arXiv 0805.0964hep-ph
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e+e碰撞中奇异和非奇异强子的热产生

The Thermal Production of Strange and Non-Strange Hadrons in e+e- Collisions

F. Becattini, P. Castorina, J. Manninen, H. Satz

摘要:

在不同的高能碰撞中观察到的热多强子产生提出了两个基本问题:(1)为什么即使是次级粒子相对较少的基本碰撞(e+e-湮灭)也表现出热行为,以及(2)为什么在这种相互作用中存在对奇异粒子产生的抑制?我们表明,最近提出的机制热强子生产通过霍金-Unruh辐射可以自然地解释这两个。色禁闭的事件视界导致了热行为,但产生的温度取决于产生的强子的奇异夸克含量,导致偏离完全平衡,从而抑制了奇异粒子的产生。我们将所得的形式主义应用于在宽能量范围内e+e-湮灭中的多强子产生,并对传统统计强子化模型和修正的Hawking-Unruh公式中的数据进行了全面的分析。我们表明,这个配方提供了一个很好的描述测量强子丰度,完全确定的弦张力和裸奇异夸克质量,它不包含可调参数。

英文摘要:

The thermal multihadron production observed in different high energy collisions poses two basic problems: (1) why do even elementary collisions with comparatively few secondaries (e+e- annihilation) show thermal behaviour, and 2) why is there in such interactions a suppression of strange particle production? We show that the recently proposed mechanism of thermal hadron production through Hawking-Unruh radiation can naturally account for both. The event horizon of colour confinement leads to thermal behaviour, but the resulting temperature depends on the strange quark content of the produced hadrons, causing a deviation from full equilibrium and hence a suppression of strange particle production. We apply the resulting formalism to multihadron production in e+e- annihilation over a wide energy range and make a comprehensive analysis of the data in the conventional statistical hadronization model and the modified Hawking-Unruh formulation. We show that this formulation provides a very good description of the measured hadronic abundances, fully determined in terms of the string tension and the bare strange quark mass; it contains no adjustable parameters.

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