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arXiv 1711.02408hep-exnucl-ex
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用ALICE探测Pb-Pb碰撞中不同寿命共振的强子相

Probing the hadronic phase with resonances of different lifetimes in Pb-Pb collisions with ALICE

Neelima Agrawal

摘要:

ALICE实验已经测量了一组丰富的强子共振的产生,例如在LHC上不同能量的pp、p-Pb和Pb-Pb碰撞中的$ρ(770)^{0}$、${\rm K}^{\ast}(892)^{0}$、$ϕ$(1020)、$Σ^{\pm}$(1385)、$Λ(1520)$和$Ξ^{\ast 0}$。本文介绍了一个全面的概述和最新成果。特别关注强子共振在研究高能碰撞中的末态效应中的作用。特别是,在重离子碰撞的共振生产的测量有能力提供洞察强子化后的一个长期的强子阶段的存在。观测到在$\sqrt{s_{\rm NN}}$ = 2.76 TeV的中心Pb-Pb碰撞中$Λ(1520)$共振的产生受到抑制,这进一步支持了这样一个致密强子相的存在,这已经由${\rm K}^{\ast}(892)^{0}$ / ${\rm K}$和$ρ(770)^{0}$ / $π$的比值所证明。

英文摘要:

The ALICE experiment has measured the production of a rich set of hadronic resonances, such as $ρ(770)^{0}$, ${\rm K}^{\ast}(892)^{0}$, $ϕ$(1020), $Σ^{\pm}$(1385), $Λ(1520)$ and $Ξ^{\ast 0}$ in pp, p-Pb and Pb-Pb collisions at various energies at the LHC. A comprehensive overview and the latest results are presented in this paper. Special focus is given to the role of hadronic resonances for the study of final-state effects in high-energy collisions. In particular, the measurement of resonance production in heavy-ion collisions has the capability to provide insight into the existence of a prolonged hadronic phase after hadronisation. The observation of the suppression of the production of $Λ(1520)$ resonance in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV adds further support to the existence of such a dense hadronic phase, as already evidenced by the ratios ${\rm K}^{\ast}(892)^{0}$/${\rm K}$ and $ρ(770)^{0}$/$π$.

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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