Subjet multiplicity of gluon and quark jets reconstructed with the κ⊥ algorithm in pp̄ collisions

DØ Collaboration

doi:10.1103/PhysRevD.65.052008

Subjet multiplicity of gluon and quark jets reconstructed with the κ_⊥ algorithm in pp̄ collisions

DØ Collaboration

Physics

Joint Institute for Nuclear Research
University of Oklahoma
IN2P3-CNRS
Michigan State University
Institute for High Energy Physics of National Research Centre ‘Kurchatov Institute’
Tata Institute of Fundamental Research
University of Texas at Arlington
University of Illinois at Chicago
Radboud University Nijmegen
University of Michigan, Ann Arbor
Centro Brasileiro de Pesquisas Físicas
Iowa State University
Universidad de los Andes Colombia
Stony Brook University
Imperial College London
University of Maryland, College Park
Fermi National Accelerator Laboratory
University of Amsterdam
Lawrence Berkeley National Laboratory
University of Kansas
Université Pierre et Marie Curie
University of Rochester
Florida State University
Panjab University
Lancaster University
Northern Illinois University

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

The DØ Collaboration has studied for the first time the properties of hadron-collider jets reconstructed with a successive-combination algorithm based on relative transverse momenta (κ_⊥) of energy clusters. Using the standard value D = 1.0 of the jet-separation parameter in the κ_⊥ 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 ≈90 (240) GeV. To examine internal jet structure, the κ_⊥ 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 (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±0.15 (stat)±_0.18 ^0.22 (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^- annihilations, and is close to the naive prediction for the ratio of color charges of C_A /C_F = 9/4 = 2.25.

Original language	English
Article number	052008
Journal	Physical Review D
Volume	65
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.65.052008
State	Published - 2002

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10.1103/PhysRevD.65.052008

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@article{f43330c102944a70bcd5c800266ab9ca,

title = "Subjet multiplicity of gluon and quark jets reconstructed with the κ⊥ algorithm in p{\=p} collisions",

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 (κ⊥) of energy clusters. Using the standard value D = 1.0 of the jet-separation parameter in the κ⊥ 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 ≈90 (240) GeV. To examine internal jet structure, the κ⊥ 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〉-1)/(〈Mq〉-1) = 1.84±0.15 (stat)±0.18 0.22 (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- annihilations, and is close to the naive prediction for the ratio of color charges of CA /CF = 9/4 = 2.25.",

author = "\{D{\O} Collaboration\} and Abazov, \{V. M.\} and B. Abbott and A. Abdesselam and M. Abolins and V. Abramov and Acharya, \{B. S.\} and Adams, \{D. L.\} and M. Adams and Ahmed, \{S. N.\} and Alexeev, \{G. D.\} and A. Alton and Alves, \{G. A.\} and N. Amos and Anderson, \{E. W.\} and Y. Arnoud and C. Avila and Baarmand, \{M. M.\} and Babintsev, \{V. V.\} and L. Babukhadia and Bacon, \{T. C.\} and A. Baden and B. Baldin and Balm, \{P. W.\} and S. Banerjee and E. Barberis and P. Baringer and J. Barreto and Bartlett, \{J. F.\} and U. Bassler and D. Bauer and A. Bean and F. Beaudette and M. Begel and A. Belyaev and Beri, \{S. B.\} and G. Bernardi and I. Bertram and A. Besson and R. Beuselinck and Bezzubov, \{V. A.\} and Bhat, \{P. C.\} and V. Bhatnagar and M. Bhattacharjee and G. Blazey and F. Blekman and S. Blessing and A. Boehnlein and Bojko, \{N. I.\} and F. Borcherding and A. Kharchilava",

year = "2002",

doi = "10.1103/PhysRevD.65.052008",

language = "English",

volume = "65",

journal = "Physical Review D",

issn = "0556-2821",

publisher = "American Institute of Physics",

number = "5",

}

TY - JOUR

T1 - Subjet multiplicity of gluon and quark jets reconstructed with the κ⊥ algorithm in pp̄ collisions

AU - DØ Collaboration

AU - Abazov, V. M.

AU - Abbott, B.

AU - Abdesselam, A.

AU - Abolins, M.

AU - Abramov, V.

AU - Acharya, B. S.

AU - Adams, D. L.

AU - Adams, M.

AU - Ahmed, S. N.

AU - Alexeev, G. D.

AU - Alton, A.

AU - Alves, G. A.

AU - Amos, N.

AU - Anderson, E. W.

AU - Arnoud, Y.

AU - Avila, C.

AU - Baarmand, M. M.

AU - Babintsev, V. V.

AU - Babukhadia, L.

AU - Bacon, T. C.

AU - Baden, A.

AU - Baldin, B.

AU - Balm, P. W.

AU - Banerjee, S.

AU - Barberis, E.

AU - Baringer, P.

AU - Barreto, J.

AU - Bartlett, J. F.

AU - Bassler, U.

AU - Bauer, D.

AU - Bean, A.

AU - Beaudette, F.

AU - Begel, M.

AU - Belyaev, A.

AU - Beri, S. B.

AU - Bernardi, G.

AU - Bertram, I.

AU - Besson, A.

AU - Beuselinck, R.

AU - Bezzubov, V. A.

AU - Bhat, P. C.

AU - Bhatnagar, V.

AU - Bhattacharjee, M.

AU - Blazey, G.

AU - Blekman, F.

AU - Blessing, S.

AU - Boehnlein, A.

AU - Bojko, N. I.

AU - Borcherding, F.

AU - Kharchilava, A.

PY - 2002

Y1 - 2002

N2 - The DØ Collaboration has studied for the first time the properties of hadron-collider jets reconstructed with a successive-combination algorithm based on relative transverse momenta (κ⊥) of energy clusters. Using the standard value D = 1.0 of the jet-separation parameter in the κ⊥ 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 ≈90 (240) GeV. To examine internal jet structure, the κ⊥ 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〉-1)/(〈Mq〉-1) = 1.84±0.15 (stat)±0.18 0.22 (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- annihilations, and is close to the naive prediction for the ratio of color charges of CA /CF = 9/4 = 2.25.

AB - The DØ Collaboration has studied for the first time the properties of hadron-collider jets reconstructed with a successive-combination algorithm based on relative transverse momenta (κ⊥) of energy clusters. Using the standard value D = 1.0 of the jet-separation parameter in the κ⊥ 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 ≈90 (240) GeV. To examine internal jet structure, the κ⊥ 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〉-1)/(〈Mq〉-1) = 1.84±0.15 (stat)±0.18 0.22 (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- annihilations, and is close to the naive prediction for the ratio of color charges of CA /CF = 9/4 = 2.25.

UR - https://www.scopus.com/pages/publications/4244109876

U2 - 10.1103/PhysRevD.65.052008

DO - 10.1103/PhysRevD.65.052008

M3 - Article

AN - SCOPUS:4244109876

SN - 0556-2821

VL - 65

JO - Physical Review D

JF - Physical Review D

IS - 5

M1 - 052008

ER -

Subjet multiplicity of gluon and quark jets reconstructed with the κ_⊥ algorithm in pp̄ collisions

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