Introduction to Hard Scattering Processes and Recent Results from Hard Probes at RHIC and LHC

37th Brazilian Meeting on Nuclear Physics

Harris, John W.^1

Physics Department, Yale University, New Haven

CT

06520-8120, United States^1

关键词: Heavy ion collision;    Heavy-quark;    Jet quenching;    Parton energy loss;    Proton interactions;    Proton-nucleus collisions;    Scattering process;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/630/1/012052/pdf
DOI  :  10.1088/1742-6596/630/1/012052

来源: IOP

【 摘 要 】

A summary is presented of recent heavy-ion collision results from hard scattering processes at RHIC and LHC. Hadrons with large transverse momentum are suppressed in heavy- ion collisions compared to proton-proton interactions, including those hadrons with heavy quarks (charm, beauty). Jets are quenched and modifications to their fragmentation are observed, the effects increasing with the centrality of the heavy-ion collision. The heavy-ion measurements are compared to those in proton-proton and proton-nucleus collisions. These results when compared to theory are consistent with the suppression and jet quenching being a product of parton energy loss in a hot QCD medium. Correlations are presented for di-jets, jets with trigger photons, and hadrons with trigger jets. The di-jet correlations exhibit a di-jet energy and momentum imbalance that increases with the centrality of the collision. The correlation results indicate that the parton energy loss is redistributed to lower momentum particles at larger angles from the axis of the hard-scattered parton.