Publication: Measurement of the azimuthal anisotropy of Image 1 and Image 2 mesons in PbPb collisions at sNN=5.02TeV

Présentation

The second-order Fourier coefficients ($v_2$) characterizing the azimuthal distributions of Image 3 and Image 4 mesons produced in PbPb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=5.02\text{TeV}$ are studied. The Image 5 mesons are reconstructed in their dimuon decay channel, as measured by the CMS detector. The collected data set corresponds to an integrated luminosity of $1.7{\text{nb}}^{-1}$. The scalar product method is used to extract the $v_2$ coefficients of the azimuthal distributions. Results are reported for the rapidity range $|y|<2.4$, in the transverse momentum interval $0<p_{\mathrm{T}}<50\text{GeV}/c$, and in three centrality ranges of 10–30%, 30–50% and 50–90%. In contrast to the $\mathrm{J}/\mathit{\psi }$ mesons, the measured $v_2$ values for the Image 5 mesons are found to be consistent with zero.