Reconstruction of Neutral-Triggered Recoil Jets in sqrt(s) = 200 GeV p+p Collisions at the STAR Experiment
Abstract
The collision of relativistic heavy-ion such as the AuAu-collisions studied at the Relativistic Heavy-Ion Collider produce a hot, dense medium with properties consistent with that of a state of matter in which quarks and gluons become deconfined, the Quark-Gluon Plasma. Collimated sprays of hadrons known as jets are produced by the fragmentation of quarks and gluons during the early stages of a heavy-ion collision, and offer a valuable probe of this medium. In particular, jets recoiling from energetic direct photons offer a "golden channel" through which we may study the complex dynamics of the medium produced in heavy-ion collisions. However, to understand the interplay between jets and the produced medium, a high-precision reference is needed in which no medium is produced.
Thus, this thesis presents a high precision measurement of the semi-inclusive yields of charged jets recoiling from energetic γdir and π⁰ triggers in √s = 200 GeV pp-collisions recorded by the STAR detector during the 2009 running year. The recoil jets were reconstructed from charged particles using the anti-kT algorithm with jet resolution parameters 0.2 and 0.5. A regularized unfolding scheme was employed to correct the measured per-trigger recoil jet yields for finite reconstruction efficiency and resolution. The energy resolution of the triggers was assessed using a simulation of the STAR electromagnetic calorimeter. The effect of a finite trigger resolution was applied to recoil jet spectra generated by PYTHIA 8.185 using a weighting scheme, and the corrected data were compared
against the weighted recoil jet spectra from PYTHIA 8.185.
Subject
Quark Gluon PlasmaDirect Photons
STAR Experiment
RHIC
Jets
Quantum Chromodynamics
Hard Probes
Citation
Anderson, Derek Murphy (2022). Reconstruction of Neutral-Triggered Recoil Jets in sqrt(s) = 200 GeV p+p Collisions at the STAR Experiment. Doctoral dissertation, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /197374.