An analysis is made of the particle composition in the final state of proton-proton (pp) collisions at 7 TeV as a function of the charged particle multiplicity (). The thermal model is used to determine the chemical freeze-out temperature as well as the radius and strangeness suppression factor . Three different ensembles are used in the analysis: the grand canonical ensemble, the canonical ensemble with exact strangeness conservation, and the canonical ensemble with exact baryon number, strangeness, and electric charge conservation. It is shown that for the highest multiplicity class the three ensembles lead to the same result. This allows us to conclude that this multiplicity class is close to the thermodynamic limit. It is estimated that the final state in pp collisions could reach the thermodynamic limit when is larger than twenty per unit of rapidity, corresponding to about 300 particles in the final state when integrated over the full rapidity interval.

中文翻译：

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TeV高质子-质子碰撞的热力学极限

分析了在7 TeV下质子-质子（pp）碰撞的最终状态下的颗粒组成与带电颗粒多样性（）。使用热模型确定化学冻结温度以及半径和奇异抑制因子。分析中使用了三种不同的合奏：大正则合奏，具有精确奇异性守恒的正则合奏以及具有精确重子数，奇异性和电荷守恒的正则合奏。结果表明，对于最高多重性类别，三个合奏得出相同的结果。这使我们可以得出结论，该多重性类别接近热力学极限。估计pp碰撞中的最终状态可以达到热力学极限。 大于每单位速度二十个，对应于在整个速度间隔内积分时处于最终状态的约300个粒子。