High-pT probes of p+Pb collisions with ATLAS

Hot Quarks 2014: Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions

Perepelitsa, Dennis V.^1

Physics Department, Brookhaven National Laboratory, Upton

NY

11973, United States^1

关键词: Jet productions;    Lead collisions;    Nuclear environments;    Nuclear modification factors;    Nucleus-nucleus collision;    Proton-nucleus collisions;    Transverse energy;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/612/1/012012/pdf
DOI  :  10.1088/1742-6596/612/1/012012

来源: IOP

【 摘 要 】

Measurements of high pTprocesses in ultrarelativistic proton-nucleus collisions are sensitive to changes in the partonic densities arising from the presence of the nuclear environment. Additionally, such measurements benchmark the so called "cold nuclear matter" effects and provide the reference for understanding the large suppression of high-pTprocesses observed in nucleus-nucleus collisions. Furthermore, measurements of the centrality dependence of jet production at forward (proton-going) rapidities may shed light on the behavior of the proton wavefunction at large Bjorken-x. The latest ATLAS results for inclusive jets and charged particles in 28.9 nb-1of 5.02 TeV proton-lead collisions at the LHC are presented. The centrality in these collisions is characterized through the sum of the total transverse energy in the lead-going forward calorimeter. The nuclear modification factors RpPband RCPare presented as a function of transverse momentum, rapidity and centrality. The jet RCPin a large rapidity region is found to be modified in a way that depends only on the total jet energy.