Sliding dumbbell method to search for the CME in heavy-ion collisions

IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pramana Pub Date : 2024-08-19 DOI:10.1007/s12043-024-02810-6
Madan M Aggarwal, Anjali Attri, Sonia Parmar, Anjali Sharma, Jagbir Singh
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Abstract

This study explores the chiral magnetic effect (CME) in ultra-relativistic heavy-ion collisions. The CME, observed as back-to-back charge separation along the magnetic field axis, is investigated using the newly developed sliding dumbbell method (SDM) applied to Au\(+\)Au events at a centre-of-mass energy \(\sqrt{s}_{\text {NN}}=\) 200 GeV generated by the AMPT model with string melting configuration. The CME-like signal is externally injected in the events by flipping charges of pairs of particles perpendicular to the reaction plane. The study reports a significant enhancement of the CME-sensitive 3-particle \(\gamma \) correlator in events with high back-to-back charge separation, in a given collision centrality. Additionally, a linear relationship is observed between the \(\sqrt{|\gamma |}\) correlator for the same-sign charge pairs and positive charge asymmetry (\(\langle A^{+}\rangle \)) across the dumbbell in CME-enriched sub-samples. Furthermore, the fraction of CME in \(\Delta \gamma \) (difference between the opposite and same sign \(\gamma \) correlators) is presented across different collision centralities having different percentages of externally injected CME-like signal. Overall, the research aims to understand and detect the CME through innovative experimental method and detailed analysis of the event structure.

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用滑动哑铃法寻找重离子碰撞中的CME
本研究探讨了超相对论重离子碰撞中的手性磁效应(CME)。利用新开发的滑动哑铃法(SDM)对Au\(+\)Au 事件进行了研究,观察到的CME是沿磁场轴的背对背电荷分离,其质心能量为\(\sqrt{s}_{text\{NN}}=\) 200 GeV,由具有弦熔化构型的AMPT模型产生。类似于CME的信号是通过垂直于反应平面的粒子对的电荷翻转从外部注入事件中的。研究报告说,在给定的碰撞中心性下,在具有高背对背电荷分离的事件中,对 CME 敏感的 3 粒子 \(\gamma \)相关器显著增强。此外,在富集了CME的子样本中,观察到同符号电荷对的\(\sqrt{|\gamma |}\)相关器与哑铃上的正电荷不对称性(\(\langle A^{+}\rangle \))之间存在线性关系。此外,不同碰撞中心的 CME 分量(相反符号和相同符号相关器之间的差异)也会在外部注入的 CME 类信号百分比不同的情况下呈现出来。总之,该研究旨在通过创新的实验方法和对事件结构的详细分析来理解和探测 CME。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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Pramana
Pramana 物理-物理:综合
CiteScore
3.60
自引率
7.10%
发文量
206
审稿时长
3 months
期刊介绍: Pramana - Journal of Physics is a monthly research journal in English published by the Indian Academy of Sciences in collaboration with Indian National Science Academy and Indian Physics Association. The journal publishes refereed papers covering current research in Physics, both original contributions - research papers, brief reports or rapid communications - and invited reviews. Pramana also publishes special issues devoted to advances in specific areas of Physics and proceedings of select high quality conferences.
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