2009/05/15 by Cerrito, L.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.0905.2530
openalex publication_date 2009/05/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Preliminary results on the measurement of four selected properties of the top quark are presented. The relative fraction of tt production through gluon fusion has been measured in the tt dilepton decay channel by the CDF Collaboration as Fgg=0.53+0.36-0.38. Using an integrated luminosity of 2.7 fb-1 collected with the CDF II detector, we also determine the tt differential cross section with respect to values up to ∼1 TeV of the tt invariant mass. We present a model-independent measurement of the helicity of W bosons produced in top quark decays, using an integrated luminosity of up to 2.7 fb-1 collected by the D0 detector, and find the fraction of longitudinal W bosons f0=0.49±0.14, and the fraction of right-handed W bosons f+=0.11±0.08. Finally, we measure the parton level forward-backward asymmetry of pair produced top quarks using an integrated luminosity of 3.2 fb-1 collected with the CDF II detector, and find AFB=0.19±0.07. All results are consistent with the predictions of the standard model.