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The spectra measurements of charged hadrons produced in the shower of aparton originating in the same hard scattering with a leptonically decaying Zboson, are reported in lead-lead (PbPb) and proton-proton (pp) collisions at anucleon-nucleon center-of-mass energy of 5.02 TeV. Both PbPb and pp data setsare recorded by the CMS experiment at the LHC, and correspond to an integratedluminosity of 1.7 nb$^{-1}$ and 320 pb$^{-1}$, respectively. Hadronic collisiondata with one reconstructed Z boson candidate with the transverse momentum$p_\mathrm{T}$ $\gt$ 30 GeV/$c$ are analyzed. The Z boson constrains theinitial energy and direction of the associated parton. In heavy ion events,azimuthal angular distributions of charged hadrons with respect to thedirection of a Z boson are sensitive to modifications of the in-medium partonshower and medium response. Compared to reference data from pp interactions,the results for central PbPb collisions indicate a modification of the angularcorrelations. The measurements of the fragmentation functions and$p_\mathrm{T}$ spectra of charged particles in Z boson events, which aresensitive to medium modifications of the parton shower longitudinal structure,are also reported. Significant modifications in central PbPb events compared topp reference data are also found for these observables.

Using Z boson events to study parton-medium interactions in PbPb collisions