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arXiv 2111.04486hep-phhep-exnucl-exnucl-th
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从高能碰撞中的平方动量转移谱计算轻介子发射源的初态温度

Initial-state temperature of light meson emission source from squared momentum transfer spectra in high-energy collisions

Qi Wang, Fu-Hu Liu, Khusniddin K. Olimov

备注：
17 pages, 6 figures. Frontiers in Physics, accepted
发表信息：
Frontiers in Physics 9, 792039 (2021) (13 pages)
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摘要：

高能虚光子-质子系统中轻介子$π^0$、$π^+$、$η$和$ρ^0$的平方动量转移谱（$γ^{*} p$）电子-质子中的$\rightarrow {\rm meson + nucleon}$过程（$ep$）碰撞测量的CLAS合作进行了分析的Monte Carlo计算，其中从入射$γ^*$到发射介子或等效地从靶质子到发射核子进行转移。在计算中，Erlang分布从多源热模型被用来描述发射粒子的横向动量谱。结果表明，平均横动量（$\langle p_T\rangle$）和初态温度（$T_i$）随光子虚度（$Q^2$）和Bjorken变量（$x_B$）的增大而增大.这使得由$\langle p_T\rangle$和$T_i$描述的发射源的激发程度随着$Q^2$和$x_B$的增加而增加。

英文摘要：

The squared momentum transfer spectra of light mesons, $π^0$, $π^+$, $η$, and $ρ^0$, produced in high-energy virtual photon-proton ($γ^{*} p$) $\rightarrow {\rm meson + nucleon}$ process in electron-proton ($ep$) collisions measured by the CLAS Collaboration are analyzed by the Monte Carlo calculations, where the transfer undergoes from the incident $γ^*$ to emitted meson or equivalently from the target proton to emitted nucleon. In the calculations, the Erlang distribution from a multi-source thermal model is used to describe the transverse momentum spectra of emitted particles. Our results show that the average transverse momentum ($\langle p_T\rangle$) and the initial-state temperature ($T_i$) increase from lower squared photon virtuality ($Q^2$) and Bjorken variable ($x_B$) to higher one. This renders that the excitation degree of emission source, which is described by $\langle p_T\rangle$ and $T_i$, increases with increasing of $Q^2$ and $x_B$.

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