Experimental data from JINR and UrQMD (latest code 3.3p2) model simulations have been used to estimate temperature and other properties of positive pions in collisions of protons with carbon nuclei at incident momentum of 4.2 GeV/c. Transverse mass and transverse momentum spectra have been used to get temperature of said particles, with the help of some fitting equations. These equations are referred as Hagedorn thermodynamic and Boltzmann distribution functions. Such functions or equations are used to describe particles spectra. Temperature of positive pions has been found to be equal to 97 ± 7 and 98 ± 12 MeV in experimental and model, respectively, using Hagedorn function. Results from both experimental and model calculations have also been compared with each other, and thus, most reliable fitting function has been suggested. It is found that Hagedorn thermodynamic function is the best reliable function to get pions’ temperature in said collision system at given momentum. Similarly, temperature obtained in this research has been compared with results from other experiments and worthy conclusions have been reached and reported.

中文翻译：

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p + C碰撞在4.2 GeV / c时产生的正离子的特征

来自JINR和UrQMD（最新代码3.3p2）模型仿真的实验数据已用于估算在4.2 GeV / c的入射动量下质子与碳核碰撞中正离子的温度和其他性质。。在一些拟合方程的帮助下，已经使用横向质量和横向动量谱来获得所述颗粒的温度。这些方程式称为Hagedorn热力学和玻尔兹曼分布函数。这些函数或方程式用于描述粒子光谱。使用Hagedorn函数，在实验和模型中发现正离子的温度分别等于97±7 MeV和98±12 MeV。实验和模型计算的结果也已相互比较，因此，提出了最可靠的拟合函数。发现在给定的动量下，哈格多恩热力学函数是获得所述碰撞系统中离子温度的最佳可靠函数。同样，