Search for strong electromagnetic fields in PbPb collisions at 5.02 TeV via azimuthal anisotropy of D0\mathrm{D^0} and D0\mathrm{\overline{D}^0} mesons

Collaboration
2019
14 pages
Report number:
  • CMS-PAS-HIN-19-008
Experiments:

Citations per year

20182019202003
Abstract:
Motivated by the search for strong electromagnetic fields created in PbPb collisions, the first measurement of the v2v_2 difference (Δv2\Delta v_2) between D0\mathrm{D^0} and D0\mathrm{\overline{D}^0} is presented as a function of rapidity. The result for the rapidity-averaged v2v_2 difference is found to be Δv2=0.001±0.001(stat)±0.003(syst)\left\langle\Delta v_2 \right\rangle = 0.001 \pm 0.001 \mathrm{(stat)} \pm 0.003 \mathrm{(syst)}, 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 D0\mathrm{D^0} (uˉc\bar{u}c) and D0\mathrm{\overline{D}^0} (ucˉu\bar{c}) mesons are presented as functions of rapidity (yy), transverse momentum (pTp_{\mathrm{T}}), and collision centrality, for PbPb collisions at 5.02 TeV5.02~\mathrm{TeV}, using data collected by the CMS experiment during the 2018 LHC run. The results improve previous ones published by CMS, by extending the pTp_{\mathrm{T}} coverage and providing more differential information. A clear centrality dependence of prompt D0\mathrm{D^0} v2v_2 is observed, while v3v_3 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 D0\mathrm{\overline{D}^0} v2v_2 and v3v_3 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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