Study of the energy dependence of the underlying event in proton-antiproton collisions

0501309 - FZÚ 2019 RIV US eng J - Journal Article
Aaltonen, T. - Albrow, M. - Amerio, S. - Lysák, Roman … Total 403 authors
Study of the energy dependence of the underlying event in proton-antiproton collisions.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 92, č. 9 (2015), s. 1-21, č. článku 092009. ISSN 1550-7998
Institutional support: RVO:68378271
Keywords : CDF * Batavia TEVATRON Coll * numerical calculations * Monte Carlo * beam-beam * experimental results * 300 GeV-cms * 900 GeV-cms * 1960 GeV-cms
OECD category: Particles and field physics
Impact factor: 4.506, year: 2015

We study charged particle production (pT>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 pT 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.

Permanent Link: http://hdl.handle.net/11104/0293301