Kinematic bias on centrality selection of jet events in pPb collisions at the LHC
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Armesto-2015-Kinematic bias on ce.pdf
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Author(s)
Armesto, Nestor
Gulhan, Doga Can
Milhano, Jose Guilherme
Date Issued
June 2015
Journal
Physics Letters B
Publisher
Elsevier
Citation
Armesto, Nestor, Doga Can Gulhan, and Jose Guilherme Milhano. “Kinematic Bias on Centrality Selection of Jet Events in pPb Collisions at the LHC.” Physics Letters B 747 (July 2015): 441–445.
Version
Final published version
Abstract
Centrality selection has been observed to have a large effect on jet observables in pPb collisions at the Large Hadron Collider, stronger than that predicted by the nuclear modification of parton densities. We study to which extent simple considerations of energy–momentum conservation which link the hard process with the underlying event that provides the centrality estimator, affect jets observables in such collisions. We develop a simplistic approach that considers first the production of jets in a pp collision as described by PYTHIA. From each pp collision, the value of the energy of the parton from the proton participating in the hard scattering is extracted. Then, the underlying event is generated simulating a pPb collision through HIJING, but with the energy of the proton decreased according to the value extracted in the previous step, and both collisions are added. This model is able to capture the bulk of the centrality effect for central to semicentral collisions, for the two available sets of data: dijets from the CMS Collaboration and single jets from the ATLAS Collaboration. As expected, the model fails for peripheral collisions where very few nucleons from Pb participate.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2015.06.032
