Recent QCD results from CDF

by Andrey Korytov (University of Florida)

Monday 2 Oct 2000, 16:30 → 16:45 Europe/Zurich

500/1-001 - Main Auditorium (CERN)

The talk is focused on the soft QCD phenomena. The particle momenta and their multiplicity in jets are analysed in the context of the Modified Leading Log Approximation. The analysis shows that perturbative QCD methods work at very low cut-off scales of 200-3000 MeV. The results are compared to those from LEP. The analysis also suggests a very simple hadronization with an approximately one-to-one correspondence between hadrons and final shower partons. I will report on the measurement of the ratio of the number of charged particles in gluon and quark jets, r = 1.7 ± 0.1. The measurement of this value at LEP has been a long standing problem: over the last ten years it slowly drifted from the earlier 1.02 ± 0.07 result to the most recent 1.51 ± 0.04. The transition from minimum-bias (soft) events to those that we associate with hard-scattered partons is also discussed. None of the Monte Carlo programs describe this transition right.

Organiser(s): Fabiola Gianotti / EP Division

Note: Tea & coffee will be served at 16.00 hrs.