| CMS Note | |
| Report number | arXiv:1704.06712 |
| Title | Charge asymmetry dependence of anisotropic flow in pPb and PbPb collisions with the CMS experiment |
| Related title | Charge asymmetry dependence of anisotropic flow in pPb and PbPb collisions with CMS experiment Charge asymmetry dependence of elliptic and triangular flow in pPb and PbPb collisions with CMS |
| Author(s) | Park, Sang Eon (Rice U.) |
| Collaboration | CMS Collaboration |
| Publication | 2017-11 |
| Imprint | 2017-04-21 |
| Number of pages | 4 |
| Note | 5 pages, 3 figures, proceedings for XXVIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2017) |
| In: | Nucl. Phys. A 967 (2017) 345-348 |
| In: | The XXVI international conference on ultrarelativistic heavy-ion collisions, Chicago, United States Of America, 6 - 11 Feb 2017, pp.345-348 |
| DOI | 10.1016/j.nuclphysa.2017.05.084 |
| Subject category | nucl-ex ; Nuclear Physics - Experiment ; Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN LHC ; CMS |
| Abstract | In nucleus-nucleus collisions, the linear dependence found for the elliptic flow harmonic of both positive or negative charged particles as a function of event charge asymmetry is predicted by the phenomenon known as the Chiral Magnetic Wave (CMW) due to its induced electric quadrupole moment. Here, the event charge asymmetry $A_{\rm ch}$ is defined as $\frac{N_{+}-N_{-}}{N_{+}+N_{-}}$, where $N_{+}$ and $N_{-}$ are the number of positive and negative charged particles, respectively. However, other scenarios are also possible and may provide alternative explanations for the experimental results. New measurements of elliptic ($v_{\rm 2}$) and triangular ($v_{\rm 3}$) flow for positive and negative charged particles as a function of $A_{\rm ch}$ in pPb and PbPb collisions at $\sqrt{s_{_{NN}}} = 5.02 \mathrm{TeV}$ are presented, using data collected by the CMS experiment during the LHC runs 1 and 2. The slopes and intercepts of the charged-dependent $v_{n}$ harmonics vs. $A_{\rm ch}$ are directly compared for pPb and PbPb collisions with similar charged-particle multiplicities, where a strong CMW effect is not expected in very high multiplicity pPb events. Moreover, a comparison is made of the slope parameters between $v_{2}$ and $v_{3}$ harmonics normalized by the inclusive charge particle $v_{n}$ in PbPb collisions as a function of centrality. These results provide a means to discriminate between the CMW and other scenarios such as local charge conservation as possible explanations for the observed charge dependent behavior. |
| Copyright/License | publication: (License: CC-BY-NC-ND-4.0) The Author(s) (License: arXiv nonexclusive-distrib. 1.0) |
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