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The strong Coulomb field created in ultrarelativistic heavy ion collisions isexpected to produce a rapidity-dependent difference ($\Delta v_2$) in thesecond Fourier coefficient of the azimuthal distribution (elliptic flow, $v_2$)between $\mathrm{D}^0$ ($\mathrm{\bar{u}c}$) and $\overline{\mathrm{D}}^0$($\mathrm{u\bar{c}}$) mesons. Motivated by the search for evidence of thisfield, the CMS detector at the LHC is used to perform the first measurement of$\Delta v_2$. The rapidity-averaged value is found to be $\langle\Delta v_2\rangle =$ 0.001 $\pm$ 0.001 (stat) $\pm$ 0.003 (syst) in PbPb collisions at$\sqrt{s_\mathrm{NN}} =$ 5.02 TeV. In addition, the influence of the collisiongeometry is explored by measuring the $\mathrm{D}^0$ and$\overline{\mathrm{D}}^0$ mesons $v_2$ and triangular flow coefficient ($v_3$)as functions of rapidity, transverse momentum ($p_\mathrm{T}$), and eventcentrality (a measure of the overlap of the two Pb nuclei). A clear centralitydependence of prompt $\mathrm{D}^0$ meson $v_2$ values is observed, while the$v_3$ is largely independent of centrality. These trends are consistent withexpectations of flow driven by the initial-state geometry.

physics letters b

Measurement of prompt $\mathrm{D}^0$ and $\overline{\mathrm{D}}^0$ meson  azimuthal asymmetry and search for strong electric fields in PbPb collisions  at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV