Measurements of azimuthal anisotropy of nonprompt D⁰ mesons in PbPb collisions at √𝑠_NN = 5.02 TeV

Authors

A. Tumasyan, CMS Collaboration

Document Type

Article

Date of this Version

11-27-2023

Citation

Phys. Lett. B 850 (2024) 138389. https:// doi.org/10.1016/j.physletb.2023.138389

Comments

Open access.

Abstract

Measurements of the elliptic (𝑣₂) and triangular (𝑣₃) azimuthal anisotropy coefficients are presented for D⁰ mesons produced in b hadron decays (nonprompt D⁰ mesons) in lead-lead collisions at √ 𝑠_NN = 5.02 TeV. The results are compared with previously published charm meson anisotropies measured using prompt D⁰ mesons. The data were collected with the CMS detector in 2018 with an integrated luminosity of 0.58 nb⁻¹. Azimuthal anisotropy is sensitive to the interactions of quarks with the hot and dense medium created in heavy ion collisions. Comparing results for prompt and nonprompt D⁰ mesons can assist in understanding the mass dependence of these interactions. The nonprompt results show lower magnitudes of 𝑣₂ and 𝑣₃ and weaker dependences on the meson transverse momentum and collision centrality than those found for prompt D⁰ mesons. The results are in agreement with theoretical predictions that include a mass dependence in the interactions of quarks with the medium.