Speaker
Description
The average $N_{part}$ and $N_{coll}$ are similar between minimum-bias OO collisions and peripheral PbPb collisions with 70-90% centrality. After accounting for event selection and geometric biases, no significant jet quenching is observed in 70–90% PbPb collisions. In marked contrast, a clear signature of jet quenching is observed in minimum-bias OO collisions. This difference, despite comparable system size, motivates a detailed study of high $p_{T}$ azimuthal anisotropy in OO collisions to directly probe the path-length dependence of parton energy loss. In this talk, we present measurements of the azimuthal anisotropy coefficients $v_{n}$ for charged particles with $p_{T}$ up to 50 GeV in OO collisions using the CMS detector. The analysis is performed with the scalar-product method over multiple centrality intervals. Nonflow contributions are systematically investigated by varying the pseudorapidity gap between charged particles measured in the tracker and reference particles in the hadronic forward calorimeters. These results provide critical constraints on the onset of jet quenching in light-ion systems and offer a unique bridge for understanding the evolution of energy loss from small to large systems.
| Is this an experimental talk? | Yes |
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| Is this on behalf of a collaboration? | Yes |
| Which collaboration? | CMS collaboration |
| Are you willing to present as a poster if it is not selected for oral presentation? | No |