High-$p_\mathrm{T}$ track $v_{n}$ harmonics in PbPb collisions at $5.02~\mathrm{TeV}$

The Fourier coefficients (n = 2,3) of the azimuthal distributions of charged particles produced in PbPb collisions at $\sqrt{s_{NN}} = 5.02~\mathrm{TeV}$ is measured with the CMS detector at the LHC over an extended transverse momentum ($p_\mathrm{T}$) range up to approximately $100~\mathrm{GeV}/c$. The data cover both the low-$p_\mathrm{T}$ region ($1 < p_\mathrm{T} < 3~\mathrm{GeV}/c$) associated with hydrodynamic flow phenomena and the high-$p_\mathrm{T}$ region where anisotropic azimuthal distributions may reflect the path-length dependence of parton energy loss in the created medium. Several methods were used to extract the Fourier coefficients, such as the scalar product method that correlating charged tracks with the energy deposited in the hadronic forward calorimeters, or multi-particle cumulant method. For the seven bins of collision centrality studied, spanning the range of $0-60\%$ most-central events, the observed $v_{2}$ values are found to first increase with $p_\mathrm{T}$, reaching a maximum around $p_\mathrm{T} = 3~\mathrm{GeV}/c$ and then to gradually decrease. In the most central ($0-5\%$) events, non-zero $v_{2}$ is observed above $\approx 30~\mathrm{GeV}/c$ and it is found to be constant as function of $p_\mathrm{T}$.