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\title{Probing hadronization with the charge correlator ratio in $pp$ and Ru+Ru/Zr+Zr collisions at $\sqrt{s_{\mathrm{{NN}}}}=200\ \mathrm{GeV}$ at STAR}
\author{Youqi Song\\(For the STAR Collaboration)}
\date{\today}

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Jet substructure observables can reveal details of the parton fragmentation and hadronization processes that create a jet. We measure a new substructure observable, the charge correlator ratio ($r_c$), that characterizes the fraction of string-like fragmentation by distinguishing the charge signs of leading and subleading charged particles within jets. This can further our understanding of non-perturbative QCD and provide tests for phenomenological hadronization models. Moreover, by measuring $r_c$ with jets created in heavy-ion collisions, we probe for potential modifications of the hadronization process due to the presence of the Quark Gluon Plasma.

We present the first fully corrected results of $r_c$ at RHIC, in $\sqrt{s}=200$ GeV $pp$ collisions recorded by the STAR detector, and compare them with Monte Carlo predictions. Additionally, we present progress on the first measurement of $r_c$ in heavy-ion collisions, with $\sqrt{s_{\mathrm{{NN}}}}=200$ GeV Ru+Ru and Zr+Zr collisions.

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