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Probing the Effects of Strong Electromagnetic Fields with Charge-Dependent Directed Flow in Pb-Pb Collisions at the LHC.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-06 , DOI: 10.1103/physrevlett.125.022301
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Zbroszczyk 103 , M Zhalov 62 , S Zhang 142 , X Zhang 17 , Z Zhang 17 , V Zherebchevskii 25 , D Zhou 17 , Y Zhou 57 , Z Zhou 23 , J Zhu 13, 17 , Y Zhu 17 , A Zichichi 8, 20, 21 , M B Zimmermann 6 , G Zinovjev 22 , N Zurlo 77 ,
Affiliation  

The first measurement at the LHC of charge-dependent directed flow (v1) relative to the spectator plane is presented for Pb-Pb collisions at sNN=5.02TeV. Results are reported for charged hadrons and D0 mesons for the transverse momentum intervals pT>0.2GeV/c and 3<pT<6GeV/c in the 5%–40% and 10%–40% centrality classes, respectively. The difference between the positively and negatively charged hadron v1 has a positive slope as a function of pseudorapidity η, dΔv1/dη=[1.68±0.49(stat)±0.41(syst)]×104. The same measurement for D0 and D¯0 mesons yields a positive value dΔv1/dη=[4.9±1.7(stat)±0.6(syst)]×101, which is about 3 orders of magnitude larger than the one of the charged hadrons. These measurements can provide new insights into the effects of the strong electromagnetic field and the initial tilt of matter created in noncentral heavy ion collisions on the dynamics of light (u, d, and s) and heavy (c) quarks. The large difference between the observed Δv1 of charged hadrons and D0 mesons may reflect different sensitivity of the charm and light quarks to the early time dynamics of a heavy ion collision. These observations challenge some recent theoretical calculations, which predicted a negative and an order of magnitude smaller value of dΔv1/dη for both light flavor and charmed hadrons.

中文翻译:

在大型强子对撞机的Pb-Pb碰撞中用电荷依赖的定向流探测强电磁场的影响。

大型强子对撞机上与电荷有关的定向流的首次测量(v1个)是相对于观众平面的Pb-Pb碰撞 s神经网络=5.02电视。报告了带电强子和d0 横向动量间隔的介子 pŤ>0.2GeV/C3<pŤ<6GeV/C分别在5%–40%和10%–40%集中度类别中。带正电和带负电的强子之间的区别v1个 正斜率是伪快速度的函数 ηdΔv1个/dη=[1.68±0.49统计±0.41系统]×10-4。相同的测量d0d¯0 介子产生正值 dΔv1个/dη=[4.9±1.7统计±0.6系统]×10-1个,比带电强子之一大3个数量级。这些测量结果可以提供新的见解,以了解强电磁场的影响以及在非中心重离子碰撞中产生的物质的初始倾斜对轻(u,d和s)和重(c)夸克动力学的影响。观察到的差异很大Δv1个 的强子和 d0介子可能反映出魅力和轻夸克对重离子碰撞的早期动力学的不同敏感性。这些观察结果对最近的一些理论计算提出了挑战,这些理论预测得出负值和较小的数量级。dΔv1个/dη 既有淡淡的风味又有迷人的强子。
更新日期:2020-07-07
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