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arXiv 2108.05299nucl-exhep-ex
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使用ALICE在前所未有的$p_{\text{T}}$范围内测量p-Pb碰撞中的轻介子核修饰因子

Measuring the light meson nuclear modification factor in p-Pb collisions over an unprecedented $p_{\text{T}}$ range with ALICE

Joshua König

摘要:

在$\sqrt{s_{\text{NN}}}$ = 8.16TeV的p-Pb碰撞和$\sqrt{s}$ = 8 TeV的pp碰撞中,测量了直到很高横动量($p_{\text{T}}$)的轻中性介子的微分不变截面.通过将ALICE中可用的EMCal和PHOS量热计以及中心桶跟踪探测器的独立重建技术相结合,组合谱覆盖了$π^{0}$介子的$p_{\rm T}$的几乎两个数量级。测量了$π^{0}$和$η$介子的核修正因子$R_{\text{pPb}}$,发现与NLO pQCD、CGC和能量损失计算结果一致.与在$\sqrt{s_{\text{NN}}}$ = 5.02 TeV中测得的$π^{0}$的$R_{\text{pPb}}$相比,提示随着碰撞能量的增加,在低$p_{\rm T}$处的抑制更强。

英文摘要:

Differential invariant cross sections of light neutral mesons in p-Pb collisions at $\sqrt{s_{\text{NN}}}$ = 8.16 TeV and in pp collisions at $\sqrt{s}$ = 8 TeV have been measured up to very high transverse momentum ($p_{\text{T}}$). By combining independent reconstruction techniques available in ALICE using the EMCal and PHOS calorimeters as well as the central barrel tracking detectors, the combined spectra cover almost two orders of magnitude in $p_{\rm T}$ for the $π^{0}$ meson. The nuclear modification factor $R_{\text{pPb}}$ has been measured for the $π^{0}$ and $η$ mesons and is found to be consistent with NLO pQCD, CGC and energy loss calculations. Comparisons to the $R_{\text{pPb}}$ of $π^{0}$ measured in $\sqrt{s_{\text{NN}}}$ = 5.02 TeV hint at a stronger suppression at low $p_{\rm T}$ with increasing collision energy.

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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