2001/08/31 by D0 collaboration, B. Abbott, V. M. Abazov +98
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevd.65.052008
published as Phys.Rev.D65:052008,2002 · Submitted to Phys.Rev.D. 24 pages, 31 figures. Updated references, minor text changes
arxiv created 2001/11/09 · openalex publication_date 2002/02/07 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
The D\O Collaboration has studied for the first time the properties of hadron-collider jets reconstructed with a successive-combination algorithm based on relative transverse momenta (k_\ensuremath⊥) of energy clusters. Using the standard value D=1.0 of the jet-separation parameter in the k_\ensuremath⊥ algorithm, we find that the pT of such jets is higher than the ET of matched jets reconstructed with cones of radius R=0.7, by about 5 (8) GeV at pT\ensuremath≈90 (240) GeV. To examine internal jet structure, the k_\ensuremath⊥ algorithm is applied within D=0.5 jets to resolve any subjets. The multiplicity of subjets in jet samples at √(s)=1800 GeV and 630 GeV is extracted separately for gluons (Mg) and quarks (Mq), and the ratio of average subjet multiplicities in gluon and quark jets is measured as (〈Mg〉\ensuremath-1)/(〈Mq〉\ensuremath-1)=1.84\ifmmode±\else\textpm\fi0.15 (stat)\ifmmode±\else\textpm\fi0.180.22 (syst). This ratio is in agreement with the expectations from the HERWIG Monte Carlo event generator and a resummation calculation, and with observations in e+e^\ensuremath- annihilations, and is close to the naive prediction for the ratio of color charges of CA/CF=9/4=2.25.