Speaker
Description
Hard-scattered partons produced early in heavy-ion collisions are used to probe the properties of the QGP (Quark-Gluon Plasma). These partons lose energy in the QGP either through elastic collisions, or through medium-induced gluon \textit{bremsstrahlung}, which is the dominant mode of energy loss for gluons and light quarks. Theoretical calculations predict that at low momentum ($p_{\mathrm{T}}$), this radiative energy loss is suppressed for heavy quarks (charm, bottom). At RHIC energies, with excellent secondary vertex resolution in the STAR experiment, these low $p_{\text{T}}$ charm-tagged jets are readily accessible.
In this talk, we present several measurements of $D^{0} (c\bar{u})$-tagged jets of different resolutions in Au+Au collisions at $\sqrt{s_{\text{NN}}} = 200 \text{ GeV}$ at STAR. We report the yields and nuclear modification factors as functions of $p_\mathrm{T,Jet}$, fragmentation function ($z = \frac{\vec{p}_{\mathrm{T, D^{0}}}.\vec{p}_{\mathrm{T, Jet}}}{|\vec{p}_{\mathrm{T, Jet}}|}$), and generalized angularities ($\lambda_\beta^\kappa=\sum\limits_{\text {const} \in \text {Jet }}\left(\frac{p_{\mathrm{T}, \mathrm{const}}}{p_{\mathrm{T}, \mathrm{Jet}}}\right)^\kappa \Delta r_{\text{const,Jet}}$) for these jets in the QGP. In addition, we present the radial profile of the $D^{0}$ mesons in these jets. Together, these measurements can help us put significant constraints on theories predicting parton flavor and mass dependence of energy loss in the medium.
| Category | Experiment |
|---|---|
| Collaboration | STAR |
