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We study the behavior of the charged particle (pT > 0.5 GeV/c, |η| 150) with PT(jet#3) < 15 GeV/c suppress the hard initial and final-state radiation thus increasing the sensitivity of the “transverse” region to the “beam-beam remnant” and the multiple parton scattering components of the “underlying event”. Unlike our previous Run 2 “underlying event” analysis which used JetClu to define “jets” and compared uncorrected data with PYTHIA Tune A and HERWIG after detector simulation (CDFSIM), in this analysis we use the MidPoint algorithm (R = 0.7, fmerge = 0.75) and correct the observables to the particle level. The corrected observables are then compared with the theory at the particle level (i.e. generator level). The theory includes PYTHIA Tune A, HERWIG, and a tuned version of JIMMY.

Using MAX/MIN Transverse Regions to Study the Underlying Event in Run 2 at the Tevatron