Subjet Multiplicity of Gluon and Quark Jets Reconstructed with the $k_{\perp}$ Algorithm in $p\bar{p}$ Collisions

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dc.creatorD0 collaboration
dc.creatorAbazov, V. M.
dc.date2001-08-31
dc.date2001-11-09
dc.date.accessioned2026-07-07T12:01:38Z
dc.date.available2026-07-07T12:01:38Z
dc.descriptionThe D0 Collaboration has studied for the first time the properties of hadron-collider jets reconstructed with a successive-combination algorithm based on relative transverse momenta ($k_{\perp}$) of energy clusters. Using the standard value D = 1.0 of the jet-separation parameter in the $k_{\perp}$ algorithm, we find that the $p_T$ of such jets is higher than the $E_T$ of matched jets reconstructed with cones of radius R = 0.7, by about 5 (8) GeV at $p_T \approx 90$ (240) GeV. To examine internal jet structure, the $k_{\perp}$ algorithm is applied within D = 0.5 jets to resolve any subjets. The multiplicity of subjets in jet samples at $\sqrt{s} = 1800$ 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 $(M_{g} - 1) / (M_{q} - 1) = 1.84 \pm 0.15 (stat.) \pm ^{0.22}_{0.18} (sys.)$. This ratio is in agreement with the expectations from the HERWIG Monte Carlo event generator and a resummation calculation, and with observations in $e^+e^-$ annihilations, and is close to the naive prediction for the ratio of color charges of $C_A/C_F = 9/4 = 2.25$.
dc.descriptionSubmitted to Phys.Rev.D. 24 pages, 31 figures. Updated references, minor text changes
dc.identifierhttps://arxiv.org/abs/hep-ex/0108054
dc.identifierhttp://arxiv.org/abs/hep-ex/0108054
dc.identifierPhys.Rev.D65:052008,2002
dc.identifierdoi:10.1103/PhysRevD.65.052008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207158
dc.subjectHigh Energy Physics - Experiment
dc.titleSubjet Multiplicity of Gluon and Quark Jets Reconstructed with the $k_{\perp}$ Algorithm in $p\bar{p}$ Collisions
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