Speaker
Description
Jets are produced in early stages of heavy-ion collisions and undergo modified showering in the quark-gluon plasma (QGP) medium relative to a vacuum case. These modifications can be measured using observables like jet momentum profile and generalized angularities to study the details of jet-medium interactions. Jet momentum profile ($\rho(r)$) encodes radially differential information about jet broadening and has shown migration of charged energy towards the jet-periphery in Pb+Pb collisions at the LHC. Measurements of generalized angularities (girth $g$ and momentum dispersion $p_T^D$) and LeSub (difference between leading and subleading constituents) from Pb+Pb collisions at the LHC show harder, or more quark-like jet fragmentation, in the presence of the medium. Measuring these distributions in heavy-ion collisions at RHIC will help us further characterize the jet-medium interactions in a phase-space region complimentary to that of the LHC.
In this talk, we present the first measurements of fully corrected $\rho(r)$, $g$, $p_T^D$ and LeSub observables using hard-core jets (jets constructed using constituents with $p_T > 2$ GeV/c to suppress the combinatorial background) in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV, collected by the STAR experiment at RHIC. Medium modifications are assessed by calculating nuclear modification factors relative to the $p+p$ baseline. Finally, data are compared with model calculations and the physics implications are discussed.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | STAR Collaboration |
