论文标题
pion-kaon femtsoscopy和pb $ - $ pb碰撞的HADRONIC阶段的寿命，$ \ sqrt {s _ {\ rm {nn}}} $ = 2.76 tev
Pion-kaon femtoscopy and the lifetime of the hadronic phase in Pb$-$Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 2.76 TeV
论文作者
论文摘要
在本文中，报告了LHC处的Pion-Kaon相关性的首次触发分析。该分析是在$ \ sqrt {s _ {\ rm {nn}}}} $ = 2.76 TEV记录在Alice detector上的PB-PB碰撞数据上执行的。非相同的粒子相关性探测了不同粒子物种的来源以及发射系统的平均源大小之间的时空分离。锥形和kaon源的尺寸随着中心性的增加而增加，并且比kaons更接近系统中心和/或更晚。在具有强径向流动的系统中，自然是可以预期的，并且通过流体动力学模型质量地再现。关于pion-kaon发射不对称的爱丽丝数据与（3+1）维粘性流体动力学一致，与统计强化模型，谐振传播和衰减代码热剂2计算，以及Kaons的1和2 fm $/c $之间的额外时间延迟。可以将延迟解释为在LHC重型离子碰撞中存在明显的辐射阶段的证据。
In this paper, the first femtoscopic analysis of pion-kaon correlations at the LHC is reported. The analysis was performed on the Pb-Pb collision data at $\sqrt{s_{\rm{NN}}}$ = 2.76 TeV recorded with the ALICE detector. The non-identical particle correlations probe the spatio-temporal separation between sources of different particle species as well as the average source size of the emitting system. The sizes of the pion and kaon sources increase with centrality, and pions are emitted closer to the centre of the system and/or later than kaons. This is naturally expected in a system with strong radial flow and is qualitatively reproduced by hydrodynamic models. ALICE data on pion-kaon emission asymmetry are consistent with (3+1)-dimensional viscous hydrodynamics coupled to a statistical hadronization model, resonance propagation, and decay code THERMINATOR 2 calculation, with an additional time delay between 1 and 2 fm$/c$ for kaons. The delay can be interpreted as evidence for a significant hadronic rescattering phase in heavy-ion collisions at the LHC.
