Probing the electromagnetic fields in ultrarelativistic collisions with leptons from Z0 decay and charmed mesons

被引：12
作者：
Sun, Yifeng [1 ,2 ]
Plumari, Salvatore [1 ,2 ]
Greco, Vincenzo [1 ,2 ]
机构：
[1] Ist Nazl Fis Nucl, Lab Nazl Sud, Via S Sofia 62, I-95123 Catania, Italy
[2] Univ Catania, Dept Phys & Astron, Via S Sofia 64, I-95125 Catania, Italy
来源：
PHYSICS LETTERS B | 2021年 / 816卷
关键词：
HEAVY-ION COLLISIONS; MAGNETIC-FIELD; LAMBDA; FLOW;
D O I：
10.1016/j.physletb.2021.136271
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Ultrarelativistic heavy ion collisions are expected to generate a huge electromagnetic field, eB approximate to 10(18) Gauss, that induces a splitting of the directed flow, v1 = (px/pT), of charged particles and antiparticles. Such a splitting for charmed meson manifests even for neutral particle/anti-particles pairs (D-0, D-0), hence being also a unique probe of the formation of the quark-gluon plasma phase. For the first time here we show that electromagnetic field may generate a v1(D0) - v1(D0) as huge as the one recently observed at LHC against early expectations. Within this new research topic we point out a novel measurement: v1 of leptons from Z(0) decay and its correlation to that of D and B mesons. The correlation for Av1of l+ -l- D-0 - D-0 and B-0 - B-0 would provide a strong probe of the electromagnetic origin of the splitting and hence of the formation of a quark-gluon plasma phase with heavy quarks as degrees of freedom. The case of the v1(l-) presents features due to the peculiar form of the pT spectrum never appreciated before in the study of heavy ion collisions. We specifically predict a sudden change of the Av1(pT) of leptons at pT = 45 GeV/c, that can be traced back to a universal relation of Av1with the slope of the pT particle distribution and the integrated effect of the Lorentz force. (C) 2021 The Authors. Published by Elsevier B.V.
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页数：5
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