Speaker
Description
Measurements at the LHC have provided evidence for collective behavior in high-multiplicity pp and pPb collisions through multiparticle correlation techniques. However, no conclusive evidence of jet quenching—characterized by the energy loss of high-$p_\mathrm{T}$ partons traversing the medium—have been observed in these smaller systems. This paradox raises an intriguing question: How can a medium that exhibits hydrodynamic-like behavior and substantially modifies the distribution of final-state hadrons have little to no effect on high-$p_\mathrm{T}$ particles? To explore this, we present a comprehensive analysis of differential Fourier coefficients ($v_{n}$) as a function of particle transverse momentum ($p_\mathrm{T}$) and event multiplicity in pp and pPb collisions, recorded by CMS at 13 TeV and 8.16 TeV, respectively. In particular, first measurements of $p_\mathrm{T}$-differential multiparticle cumulants using the subevent method are reported, probing an extended phase space region up to high $p_\mathrm{T}$ values. Furthermore, we compare the results across pp, pPb, and PbPb collisions within similar multiplicity ranges. This comparison will help assess similarities and differences in the medium's interaction with high-$p_\mathrm{T}$ particles in these three collision types.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | CMS |
