Momentum distribution of charged particles in jets in dijet events in <em>pp</em> collisions at s√=1.8TeV and comparisons to perturbative QCD predictions

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Title		Momentum distribution of charged particles in jets in dijet events in pp collisions at s√=1.8TeV and comparisons to perturbative QCD predictions
Collaboration		CDF Collaboration With : Clark, Allan Geoffrey / Kambara, Hisanori / Speer, Thomas / Strumia Michelini, Federica / Wu, Xin
Published in		Physical Review. D. 2003, vol. 68, no. 01, p. 012003
Abstract		Inclusive momentum distributions of charged particles in restricted cones around jet axes were measured in dijet events with invariant dijet masses in the range 80 to 600GeV/c2. Events were produced at the Fermilab Tevatron in pp¯ collisions with a center of mass energy of 1.8 TeV and recorded by the Collider Detector at Fermilab. The results were compared to perturbative QCD calculations carried out in the framework of the modified leading log approximation (MLLA) and assuming local parton-hadron duality. It was shown that the data follow theoretical predictions quite well over the whole range of the jet energies included in this analysis. We extracted the MLLA cutoff scale Qeff and found a value of 230±40MeV. The theoretical prediction of Ejetsinθc scaling, where θc is the cone opening angle, was experimentally observed for the first time. From the MLLA fits to the data, two more parameters were extracted: the ratio of parton multiplicities in gluon and quark jets, r=Ng−jetpartons/Nq−jetpartons = 1.9±0.5, and the ratio of the number of charged hadrons to the number of predicted partons in a jet, KchargedLPHD=Nchargedhadrons/Npartons=0.56±0.10.
Identifiers		DOI: 10.1103/PhysRevD.68.012003
Full text		Article (Published version) (581 Kb) - Free access Other version: http://journals.aps.org/prd/abstract/10.1103/PhysRevD.68.012003
Structures		Faculté des sciences / Section de physique / Département de physique nucléaire et corpusculaire
Citation (ISO format)		CDF COLLABORATION. Momentum distribution of charged particles in jets in dijet events in pp collisions at s√=1.8TeV and comparisons to perturbative QCD predictions. In: Physical Review. D, 2003, vol. 68, n° 01, p. 012003. https://archive-ouverte.unige.ch/unige:38050

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Deposited on : 2014-06-24

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Momentum distribution of charged particles in jets in dijet events in pp collisions at s√=1.8TeV and comparisons to perturbative QCD predictions