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arXiv 2001.03200hep-phnucl-th
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基于强子产生的两分量模型的高能A-B核碰撞中识别强子$\bf p_t$谱的微分比较

Differential comparison of identified-hadron $\bf p_t$ spectra from high-energy A-B nuclear collisions based on a two-component model of hadron production

Thomas A. Trainor

摘要:

利用高能核碰撞中强子产生的二分量(软硬)模型(TCM),分析了2.76 TeV Pb-Pb和$p$ - $p$碰撞中的识别强子(PID)谱. PID TCM是从最近分析的5 TeV的$p$ -Pb碰撞的PID强子谱的微小变化。从LHC数据的结果进行了比较与PID TCM为200 GeV的金-金π介子和质子光谱。2.76 TeV质子谱在1 GeV/c以上表现出很强的低效率,通过比较$p$ - $p$谱与相应的TCM估计。经过无效校正后,Pb-Pb质子谱与Au-Au质子谱非常相似。PID A-A谱通常与径向流不一致。喷流相关的Pb-Pb和Au-Au光谱硬成分表现出较强的抑制在更高的$p_t$在更中心的碰撞对应的结果从频谱比$R_{AA}$,但也为π介子和K介子,表现出显着的增强低于$p_t = 1$ GeV/c被掩盖的$R_{AA}$。相比之下,质子硬分量的增强只出现在1 GeV/c以上,这表明重子/介子“之谜”是一个喷流现象。在更中心的A-A碰撞的光谱硬成分的修改是一致的,在喷流形成过程中增加胶子分裂,但通过较低的$p_t$增强喷流内的领先部分子能量近似守恒。

英文摘要:

Identified-hadron (PID) spectra from 2.76 TeV Pb-Pb and $p$-$p$ collisions are analyzed via a two-component (soft + hard) model (TCM) of hadron production in high-energy nuclear collisions. The PID TCM is adapted with minor changes from a recent analysis of PID hadron spectra from 5 TeV $p$-Pb collisions. Results from LHC data are compared with a PID TCM for 200 GeV Au-Au pion and proton spectra. 2.76 TeV proton spectra exhibit strong inefficiencies above 1 GeV/c estimated by comparing the $p$-$p$ spectrum with the corresponding TCM. After inefficiency correction Pb-Pb proton spectra are very similar to Au-Au proton spectra. PID A-A spectra are generally inconsistent with radial flow. Jet-related Pb-Pb and Au-Au spectrum hard components exhibit strong suppression at higher $p_t$ in more-central collisions corresponding to results from spectrum ratio $R_{AA}$ but also, for pions and kaons, exhibit dramatic enhancements below $p_t = 1$ GeV/c that are concealed by $R_{AA}$. In contrast, enhancements of proton hard components appear only above 1 GeV/c suggesting that the baryon/meson "puzzle" is a jet phenomenon. Modification of spectrum hard components in more-central A-A collisions is consistent with increased gluon splitting during jet formation but with approximate conservation of leading-parton energy within a jet via the lower-$p_t$ enhancements.

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