Subjet multiplicity of gluon and quark jets reconstructed with thek⊥algorithm inpp¯collisions
Citations Over TimeTop 13% of 2002 papers
Abstract
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 ${(k}_{\ensuremath{\perp}})$ of energy clusters. Using the standard value $D=1.0$ of the jet-separation parameter in the ${k}_{\ensuremath{\perp}}$ algorithm, we find that the ${p}_{T}$ of such jets is higher than the ${E}_{T}$ of matched jets reconstructed with cones of radius $\mathcal{R}=0.7,$ by about 5 (8) GeV at ${p}_{T}\ensuremath{\approx}90 (240) \mathrm{GeV}.$ To examine internal jet structure, the ${k}_{\ensuremath{\perp}}$ algorithm is applied within $D=0.5$ jets to resolve any subjets. The multiplicity of subjets in jet samples at $\sqrt{s}=1800 \mathrm{GeV}$ and 630 GeV is extracted separately for gluons ${(M}_{g})$ and quarks ${(M}_{q}),$ and the ratio of average subjet multiplicities in gluon and quark jets is measured as $(〈{M}_{g}〉\ensuremath{-}1)/(〈{M}_{q}〉\ensuremath{-}1)=1.84\ifmmode\pm\else\textpm\fi{}0.15 (\mathrm{stat}){\ifmmode\pm\else\textpm\fi{}}_{0.18}^{0.22} (\mathrm{syst}).$ 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 ${C}_{A}{/C}_{F}=9/4=2.25.$
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