Speaker
Description
Jet quenching phenomena in ultrarelativistic nucleus–nucleus collisions arise from the energy loss of high-energy partons propagating through the quark–gluon plasma, leading to a suppression of high-$p_{\mathrm{T}}$ particle yields. While strong suppression has been observed in heavy-ion collisions, its dependence on the size of the nuclear system has not yet been systematically measured. We present a comparative study of high-$p_{\mathrm{T}}$ charged-particle nuclear modification factors across four collision systems, based on measurements performed by the CMS experiment at the LHC. Existing results in oxygen–oxygen, xenon–xenon, and lead–lead collisions are recast using a common $p_{\mathrm{T}}$ binning and extended with the first measurement of charged-particle $R_{\mathrm{AA}}$ in neon–neon collisions at $\sqrt{s_{\mathrm{NN}}}=5.36$ TeV. By presenting the suppression patterns as functions of $p_{\mathrm{T}}$ and the nuclear mass number $A$, this study provides new experimental leverage on the system-size dependence of parton energy loss and constrains the path-length and medium-density dependence of jet quenching in QCD matter.
| 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 |