Measurement of prompt D 0 and D‾ 0 meson azimuthal anisotropy and search for strong electric fields in PbPb collisions at s NN =5.02TeV

CMS Collaboration, Freya Blekman, Emil Sørensen Bols, Simranjit Singh Chhibra, Jorgen D'Hondt, Jarne Theo De Clercq, Denys Lontkovskyi, Steven Lowette, Ivan Marchesini, Seth Moortgat, Quentin Python, Stefaan Tavernier, Walter Van Doninck, Petra Van Mulders

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
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Abstract

The strong Coulomb field created in ultrarelativistic heavy ion collisions is expected to produce a rapidity-dependent difference (Δv 2) in the second Fourier coefficient of the azimuthal distribution (elliptic flow, v 2) between D 0 (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 Δv 2. The rapidity-averaged value is found to be 〈Δv 2〉=0.001±0.001(stat)±0.003(syst) in PbPb collisions at s NN =5.02TeV. In addition, the influence of the collision geometry is explored by measuring the D 0 and D‾ 0mesons v 2 and triangular flow coefficient (v 3) 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 D 0 meson v 2 values is observed, while the v 3 is largely independent of centrality. These trends are consistent with expectations of flow driven by the initial-state geometry.

Original languageEnglish
Article number136253
Number of pages25
JournalPhys. Lett. B
Volume816
Issue number2021
DOIs
Publication statusPublished - 10 May 2021

Bibliographical note

Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-008 (CMS Public Pages)

Keywords

  • hep-ex

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