# Measurement of the kT Distribution of Particles in Jets Produced in pp̅ Collisions at √s=1.96  TeV

http://hdl.handle.net/10138/24133

#### Citation

CDF Collaboration 2009 , ' Measurement of the kT Distribution of Particles in Jets Produced in pp̅ Collisions at √s=1.96  TeV ' , Physical Review Letters , vol 102 , no. 23 , pp. 232002 .

 Title: Measurement of the kT Distribution of Particles in Jets Produced in pp̅ Collisions at √s=1.96  TeV Author: Aaltonen, T.; Mehtälä, Petteri; Orava, Risto; Mäki, Tuula; Saarikko, Heimo; Österberg, Kenneth Contributor: University of Helsinki, Department of PhysicsUniversity of Helsinki, Helsinki Institute of PhysicsUniversity of Helsinki, Department of PhysicsUniversity of Helsinki, Helsinki Institute of Physics (HIP) (-2009)University of Helsinki, Department of PhysicsUniversity of Helsinki, Department of Physics Belongs to series: Physical Review Letters ISSN: 0031-9007 Abstract: We present a measurement of the transverse momentum with respect to the jet axis (kt) of particles in jets produced in pp̅ collisions at √s=1.96  TeV. Results are obtained for charged particles in a cone of 0.5 radians around the jet axis in events with dijet invariant masses between 66 and 737  GeV/c2. The experimental data are compared to theoretical predictions obtained for fragmentation partons within the framework of resummed perturbative QCD using the modified leading log and next-to-modified leading log approximations. The comparison shows that trends in data are successfully described by the theoretical predictions, indicating that the perturbative QCD stage of jet fragmentation is dominant in shaping basic jet characteristics.We present a measurement of the transverse momentum with respect to the jet axis ($k_{T}$) of particles in jets produced in $p\bar p$ collisions at $\sqrt{s}=1.96$ TeV. Results are obtained for charged particles within a cone of opening angle 0.5 radians around the jet axis in events with dijet invariant masses between 66 and 737 GeV/c$^{2}$. The experimental data are compared to theoretical predictions obtained for fragmentation partons within the framework of resummed perturbative QCD using the modified leading log and next-to-modified leading log approximations. The comparison shows that trends in data are successfully described by the theoretical predictions, indicating that the perturbative QCD stage of jet fragmentation is dominant in shaping basic jet characteristics. Peer review status: Peer reviewed URI: http://hdl.handle.net/10138/24133 Date: 2009 Subject: 114 Physical sciences hep-ex
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