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We study the underlying event in proton-antiproton collisions by examiningthe behavior of charged particles (transverse momentum pT > 0.5 GeV/c,pseudorapidity |\eta| < 1) produced in association with large transversemomentum jets (~2.2 fb-1) or with Drell-Yan lepton-pairs (~2.7 fb-1) in theZ-boson mass region (70 < M(pair) < 110 GeV/c2) as measured by CDF at 1.96 TeVcenter-of-mass energy. We use the direction of the lepton-pair (in Drell-Yanproduction) or the leading jet (in high-pT jet production) in each event todefine three regions of \eta-\phi space; toward, away, and transverse, where\phi is the azimuthal scattering angle. For Drell-Yan production (excluding theleptons) both the toward and transverse regions are very sensitive to theunderlying event. In high-pT jet production the transverse region is verysensitive to the underlying event and is separated into a MAX and MINtransverse region, which helps separate the hard component (initial andfinal-state radiation) from the beam-beam remnant and multiple partoninteraction components of the scattering. The data are corrected to theparticle level to remove detector effects and are then compared with severalQCD Monte-Carlo models. The goal of this analysis is to provide data that canbe used to test and improve the QCD Monte-Carlo models of the underlying eventthat are used to simulate hadron-hadron collisions.

Studying the Underlying Event in Drell-Yan and High Transverse Momentum Jet Production at the Tevatron