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arXiv 1509.09083nucl-exhep-exhep-phnucl-th
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从高能碰撞的横动量谱解出粒子的随机热运动和源的集体膨胀

Disentangling random thermal motion of particles and collective expansion of source from transverse momentum spectra in high energy collisions

Hua-Rong Wei, Fu-Hu Liu, Roy A. Lacey

备注：
19 pages, 12 figures. Journal of Physics G, accepted
发表信息：
Journal of Physics G 43, 125102 (2016) (25 pages)
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摘要：

本文在多尺度热模型的框架下，描述了金-金（Au-Au）、铜-铜（Cu-Cu）、铅-铅（Pb-Pb）、质子-铅（Pb-Pb）中末态轻味粒子的横动量谱的实验结果（$p$ -Pb）和质子-质子（$p$ - $p$）碰撞在各种能量，测量的凤凰，星，爱丽丝，和CMS合作，通过使用Tsallis标准（Tsallis形式的费米-狄拉克或玻色-爱因斯坦），Tsallis，和两个或三个组件的标准分布，实际上可以被视为不同类型的“温度计”或“温标”和“速度计”。在这三个分布中的一个中心参数是有效温度，它包含了发射源的动力学冻结温度的信息，并反映了粒子的随机热运动以及源的集体膨胀的影响。为了解开这两种影响，我们从有效温度的截距中提取动力学冻结温度（$T$）曲线作为粒子静止质量的函数（$m_0$）当绘制$T$与$m_0$的曲线图时，平均横向动量斜率的平均横向流速当绘制$\langle p_T \rangle$与$\overline{m}$时，（$\langle p_T \rangle$）曲线作为平均移动质量（$\overline{m}$）的函数。

英文摘要：

In the framework of a multisource thermal model, we describe experimental results of the transverse momentum spectra of final-state light flavour particles produced in gold-gold (Au-Au), copper-copper (Cu-Cu), lead-lead (Pb-Pb), proton-lead ($p$-Pb), and proton-proton ($p$-$p$) collisions at various energies, measured by the PHENIX, STAR, ALICE, and CMS Collaborations, by using the Tsallis-standard (Tsallis form of Fermi-Dirac or Bose-Einstein), Tsallis, and two- or three-component standard distributions which can be in fact regarded as different types of "thermometers" or "thermometric scales" and "speedometers". A central parameter in the three distributions is the effective temperature which contains information on the kinetic freeze-out temperature of the emitting source and reflects the effects of random thermal motion of particles as well as collective expansion of the source. To disentangle both effects, we extract the kinetic freeze-out temperature from the intercept of the effective temperature ($T$) curve as a function of particle's rest mass ($m_0$) when plotting $T$ versus $m_0$, and the mean transverse flow velocity from the slope of the mean transverse momentum ($\langle p_T \rangle$) curve as a function of mean moving mass ($\overline{m}$) when plotting $\langle p_T \rangle$ versus $\overline{m}$.

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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