Search for strong electromagnetic fields in PbPb collisions at 5.02 TeV via azimuthal anisotropy of and mesons
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Abstract:
Motivated by the search for strong electromagnetic fields created in PbPb collisions, the first measurement of the difference () between and is presented as a function of rapidity. The result for the rapidity-averaged difference is found to be , consistent with zero within experimental uncertainties. Comparisons with models may help to directly constrain the electric conductivity of the hot and dense medium formed in these collisions. Measurements of flow harmonics of () and () mesons are presented as functions of rapidity (), transverse momentum (), and collision centrality, for PbPb collisions at , using data collected by the CMS experiment during the 2018 LHC run. The results improve previous ones published by CMS, by extending the coverage and providing more differential information. A clear centrality dependence of prompt is observed, while is largely independent of centrality. The trend is consistent with expectations of flow driven by the initial-state geometry. No significant rapidity dependence of prompt and is observed.Note:
- Preliminary results
- Monte-Carlo
- heavy ion: scattering
- lead
- charged particle: angular distribution
- electromagnetic field: high
- conductivity: electric
- angular distribution: anisotropy
- rapidity dependence
- meson
- flow
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