Dresden 2000 – scientific programme
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T: Teilchenphysik
T 101: QCD 1
T 101.1: Talk
Monday, March 20, 2000, 14:15–14:30, H\,01
Comparison of underlying event energy in Herwig and CDF data — •V. Tano1, S. Bethke1, O. Biebel1, M. Blumenstengel1, J. Böhme2, D. Lanske2, P.A. Movilla Fernández1, P. Pfeifenschneider2, R. Seuster2, and M. Tönnesmann1 — 1Max-Planck-Institut für Physik, München — 2III. Physikalisches Institut A, RWTH Aachen
Due to the importance of the inclusive jet cross section to test perturbative QCD at the highest Q2 scale, it is necessary to carefully consider all systematic effects that influence the measurement. Underlying event is one of the main systematic uncertainties when calculating jet energy in hadron collisions. Underlying events are mostly originated from soft spectator parton interactions, and therefore their contribution cannot be perturbatively calculated. There may also be a contribution due to hard interactions between spectator partons, which create particles at transverse momentum large enough for perturbative calculations, but much smaller than that of the primary interaction responsible for the highest Et jets in the event. In order to determine more accurately the energy contribution in a jet cone due to the underlying event, we study the energy in a cone of radius 0.7 both in jet events and in minimum bias events. We use Herwig for our calculation and we compare the results with CDF data from run 1b where the average istantaneous luminosity was ≈ 9 × 1030 cm−2 s−1.