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arXiv 2206.04574nucl-exhep-ex
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在CERN大型强子对撞机上Pb-Pb碰撞中$\u221a s_{\rm NN}$ = 5.02 TeV下流动角与流动幅度涨落的观测

Observation of flow angle and flow magnitude fluctuations in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV at the CERN Large Hadron Collider

ALICE Collaboration

AI总结:

本文首次利用四粒子关联器测量Pb-Pb碰撞中流动角与流动幅度的涨落,发现其在中心碰撞和横向动量大于2 GeV/c时最强,并与理论模型比较揭示对初始状态的独特敏感性。

摘要:

本文报道了利用新的四粒子关联器首次测量横向动量依赖的流动角$Ψ_n$和流动幅度$v_n$的涨落。测量在CERN大型强子对撞机上ALICE实验进行的Pb-Pb碰撞中,质心系能量每核子对为$\sqrt{s_{\rm NN}}$ = 5.02 TeV,覆盖多种中心度。在所呈现的中心度范围内,流动角和流动幅度的涨落均被观测到,且在中心碰撞和横向动量$p_{\rm T}>2$ GeV/$c$时最强。与理论模型(包括iEBE-VISHNU、MUSIC和AMPT)的比较表明,这些测量对重离子碰撞的初始状态具有独特的敏感性。

英文摘要:

This Letter reports on the first measurements of transverse momentum dependent flow angle $Ψ_n$ and flow magnitude $v_n$ fluctuations, determined using new four-particle correlators. The measurements are performed for various centralities in Pb-Pb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\rm NN}}$ = 5.02 TeV with ALICE at the CERN Large Hadron Collider. Both flow angle and flow magnitude fluctuations are observed in the presented centrality ranges and are strongest in the most central collisions and for a transverse momentum $p_{\rm T}>2$ GeV/$c$. Comparison with theoretical models, including iEBE-VISHNU, MUSIC, and AMPT, show that the measurements exhibit unique sensitivities to the initial state of heavy-ion collisions.

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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