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A novel invariant mass method to isolate resonance backgrounds from the chiral magnetic effect
- Source :
- Nucl. Phys. A982 (2019) 563-566
- Publication Year :
- 2018
-
Abstract
- The Chiral Magnetic Effect (CME) refers to charge separation along a strong magnetic field, due to topological charge fluctuations in QCD. Charge correlation ($\Delta\gamma$) signals consistent with CME have been first observed almost a decade ago. It has also been known since then that the $\Delta\gamma$ is contaminated by a major background from resonance decays coupled with elliptic flow. In this contribution, we propose differential $\Delta\gamma$ measurements as function of the pair invariant mass ($m_{\rm inv}$). The $\Delta\gamma$ in the high $m_{\rm inv}$ region is essentially free of resonance backgrounds. In the low $m_{\rm inv}$ region, the $\Delta\gamma$ backgrounds show resonance peaks. The CME signal, presumably smooth in $m_{\rm inv}$, may thus be extracted from a two-component model fit. We demonstrate the feasibility and effectiveness of this novel method by using the AMPT and toy-model Monte-Carlo simulations. We also discuss an application of the method in data analysis.<br />Comment: 4 pages 4 figures. Quark Matter 2018 proceedings
- Subjects :
- Nuclear Experiment
Nuclear Theory
Subjects
Details
- Database :
- arXiv
- Journal :
- Nucl. Phys. A982 (2019) 563-566
- Publication Type :
- Report
- Accession number :
- edsarx.1808.03210
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.nuclphysa.2018.08.006