Jet mass issue in dijet angular distributions


12th Apr 2001 - talk on D0RunII QCD Meeting
- studies made on 26000 Pythia QCD events with pTmin=40GeV, with 2.5 minimum bias events in average (p05.00.04 production release, reco_analyze)

Classical approach - massless jets     slide1
Classical approach - mass jets slide2
Collins-Soper approach slide3
- calorimeter level - RunII Cone algorithm with R=0.7 - ps.gz
- particle level - RunII Cone algorithm with R=0.7 - ps.gz

Summary
- a proper treatment of jet masses doesn't change much the shape of the dijet angular distribution
- nevertheless, there is a noticable shift in chi variable (about 0.07 in case of classical approach and about 0.6 in case of Collins-Soper approach)

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Last update 4th May 2001 by AK.