Measurement of prompt D&lt;sup&gt;0&lt;/sup&gt; and D‾&lt;sup&gt;0&lt;/sup&gt; meson azimuthal anisotropy and search for strong electric fields in PbPb collisions at √&lt;em&gt;s&lt;/em&gt;&lt;sub&gt;&lt;sub&gt;NN&lt;/sub&gt;&lt;/sub&gt; = 5.02 TeV

Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Frühwirth, R.; Jeitler, M.; Caminada, L.; Deiters, K.; Erdmann, W.; Horisberger, R.; Ingram, Q.; Kaestli, H.C.; Kotlinski, D.; Langenegger, U.; Rohe, T.; Vetens, W.

doi:10.1016/j.physletb.2021.136253

Measurement of prompt D⁰ and D‾⁰ meson azimuthal anisotropy and search for strong electric fields in PbPb collisions at √s_{_NN} = 5.02 TeV

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Dragicevic M, Erö J, Escalante Del Valle A, Frühwirth R, Jeitler M, Caminada L, Deiters K, Erdmann W, Horisberger R, Ingram Q, Kaestli HC, Kotlinski D, Langenegger U, Rohe T, Vetens W, et al.

Citation

Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Dragicevic, M., … Vetens, W. (2021). Measurement of prompt D⁰ and D‾⁰ meson azimuthal anisotropy and search for strong electric fields in PbPb collisions at √s_{_NN} = 5.02 TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 816, 136253 (25 pp.). https://doi.org/10.1016/j.physletb.2021.136253

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:39326

The strong Coulomb field created in ultrarelativistic heavy ion collisions is expected to produce a rapidity-dependent difference (Δv₂) in the second Fourier coefficient of the azimuthal distribution (elliptic flow, v₂) between D⁰ (u‾c) and D‾⁰ (uc‾) mesons. Motivated by the search for evidence of this field, the CMS detector at the LHC is used to perform the first measurement of Δv₂. The rapidity-averaged value is found to be 〈Δv₂〉= 0.001 ± 0.001 (stat) ± 0.003 (syst) in PbPb collisions at √s_{_NN} = 5.02 TeV. In addition, the influence of the collision geometry is explored by measuring the D⁰ and D‾⁰ mesons v₂ and triangular flow coefficient (v₃) as functions of rapidity, transverse momentum (p_T), and event centrality (a measure of the overlap of the two Pb nuclei). A clear centrality dependence of prompt D⁰ meson v₂ values is observed, while the v₃ is largely independent of centrality. These trends are consistent with expectations of flow driven by the initial-state geometry.