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arXiv 1803.05409hep-phnucl-th
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$\sqrt{s}$ = 7时高多重数$pp$碰撞的热力学极限TeV

Thermodynamic limit in high-multiplicity $pp$ collisions at $\sqrt{s}$ = 7 TeV

Natasha Sharma, Jean Cleymans, Boris Hippolyte

摘要:

的分析是由在7 TeV的$pp$碰撞作为带电粒子多重性($dN_{ch}/dη$)的函数的最终状态的粒子组合物。热模型用于确定化学冻结温度以及半径和奇异抑制因子$γ_s$。在分析中使用了三种不同的合奏。巨正则系综、具有精确奇异度守恒的正则系综和具有精确重子数、奇异度和电荷守恒的正则系综。结果表明,对于最高的多重性类的三个合奏导致相同的结果。这使我们可以得出结论,这个多重性类接近热力学极限。当$dN_{ch}/dη$大于每单位快度20个粒子时,$pp$碰撞的末态粒子数将达到热力学极限,这相当于在整个快度区间上积分时,末态粒子数约为300个。

英文摘要:

An analysis is made of the particle composition in the final state of $pp$ collisions at 7 TeV as a function of the charged particle multiplicity ($dN_{ch}/dη$). The thermal model is used to determine the chemical freeze-out temperature as well as the radius and strangeness suppression factor $γ_s$. 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 $dN_{ch}/dη$ is larger than twenty per unit of rapidity, corresponding to about 300 particles in the final state when integrated over the full rapidity interval.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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