Study of the energy dependence of the underlying event in proton-antiproton collisions
Name
PhysRevD.92.092009.pdf
Size
4.75 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Aaltonen, T.
Albrow, M.
Amerio, S.
Amidei, D.
Anastassov, A.
Annovi, A.
Antos, J.
Apollinari, G.
Appel, J. A.
Arisawa, T.
Date Issued
November 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaltonen, T., et al. "Study of the energy dependence of the underlying event in proton-antiproton collisions." Phys. Rev. D 92, 092009 (November 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We study charged particle production (p[subscript T] > 0.5 GeV/c, |η| < 0.8) in proton-antiproton collisions at total center-of-mass energies √s = 300 GeV, 900 GeV, and 1.96 TeV. We use the direction of the charged particle with the largest transverse momentum in each event to define three regions of η - ϕ space: “toward”, “away”, and “transverse.” The average number and the average scalar p[subscript T] sum of charged particles in the transverse region are sensitive to the modeling of the “underlying event.” The transverse region is divided into a MAX and MIN transverse region, which helps separate the “hard component” (initial and final-state radiation) from the “beam-beam remnant” and multiple parton interaction components of the scattering. The center-of-mass energy dependence of the various components of the event is studied in detail. The data presented here can be used to constrain and improve QCD Monte Carlo models, resulting in more precise predictions at the LHC energies of 13 and 14 TeV.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevD.92.092009
