{"title":"Sliding dumbbell method to search for the CME in heavy-ion collisions","authors":"Madan M Aggarwal, Anjali Attri, Sonia Parmar, Anjali Sharma, Jagbir Singh","doi":"10.1007/s12043-024-02810-6","DOIUrl":null,"url":null,"abstract":"<div><p>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<span>\\(+\\)</span>Au events at a centre-of-mass energy <span>\\(\\sqrt{s}_{\\text {NN}}=\\)</span> 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 <span>\\(\\gamma \\)</span> correlator in events with high back-to-back charge separation, in a given collision centrality. Additionally, a linear relationship is observed between the <span>\\(\\sqrt{|\\gamma |}\\)</span> correlator for the same-sign charge pairs and positive charge asymmetry (<span>\\(\\langle A^{+}\\rangle \\)</span>) across the dumbbell in CME-enriched sub-samples. Furthermore, the fraction of CME in <span>\\(\\Delta \\gamma \\)</span> (difference between the opposite and same sign <span>\\(\\gamma \\)</span> 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.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Pramana","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1007/s12043-024-02810-6","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
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.
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.