Search for jet quenching with high

Measurements at the LHC have provided evidence for collective behavior in high-multiplicity proton-lead (pPb) collisions through multiparticle correlation techniques. Yet, no conclusive evidence of jet quenching — the energy loss of high-pT partons as they traverse the medium — has been detected in pPb. This raises the intriguing question: How can a medium described by hydrodynamics, and that significantly modifies the distribution of final-state hadrons, yet has no significant impact on the distribution of high-pT particles? To investigate this, a comprehensive study of differential Fourier coefficients (vn) in particle transverse momentum (pT) and event multiplicity is presented in pPb collisions recorded by the CMS experiment at a nucleon-nucleon centerof- mass energy √sNN = 8.16 TeV. In particular, new measurements of pT-differential multiparticle cumulants using the subevent method probes an extended phase space region up to a high particle pT. Additionally, we compare the results between pPb and PbPb collisions in the same multiplicity window.