Study of Jet Properties in Au + Au Collisions at RHIC

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F24%3A00618540" target="_blank" >RIV/61389005:_____/24:00618540 - isvavai.cz</a>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Study of Jet Properties in Au + Au Collisions at RHIC

Original language description

Jets serve as a final-state approximation of high-energy partons. Jet quenching in central nucleus-nucleus collisions at high-energy has long been one of the key evidences of quark–gluon plasma formation, which is a state of matter thought to exist in the very early universe. Studying jet production inside the quark–gluon plasma and comparing it to a vacuum reference can therefore provide valuable information about this exotic state of matter.nThis work presents the first analysis of inclusive fully-reconstructed jet spectra in Au+Au collisions at center-of-mass energy per nucleon–nucleon pair √sNN = 200 GeV at RHIC. Reconstructed jets contain both charged and neutral particles, as measured by the STAR experiment. Several techniques are employed in order to reduce the effects of the large and fluctuating background – especially in central Au+Au collisions – and the spectra are also fully corrected for the effects caused by the limited efficiency and resolution of the experimental systems using state-of-the-art unfolding techniques. Fully corrected spectra are reported up to pT,jet = 60 GeV/c in central Au+Au collisions, significantly extending the reach of similar measurements for jets containing only charged particles at RHIC kinematics and allowing for direct comparison with results from experiments at the LHC. The thesis also presents and discusses various biases imposed on the presented spectra.nThe results show significant jet yield suppression in central Au+Au collisions compared to p+p collisions simulated by the PYTHIA Monte-Carlo event generator. The obtained values RAA∼ 0.2 − 0.3 indicate large energy losses of the highly-energetic partons inside the quark–gluon plasma with slight dependence on the jet transverse momentum. The magnitude of suppression is consistent with the results published by the ALICE experiment and with the prediction of theoretical calculations which incorporate jet quenching. The RAA in peripheral Au+Au collisions is consistent with unity within uncertainties, indicating the small or negligible effects of cold nuclear matter on jet production. nFinally, this thesis also contains a short report on other contributions by the author, including the ongoing tracking efficiency uncertainty study conducted alongside the main analysis as a STAR service task.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

10304 - Nuclear physics

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů