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

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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 - Particles, Fields, Gravitation and Cosmology
Volume	65
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.65.052008
State	Published - 2002
Externally published	Yes

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10.1103/PhysRevD.65.052008

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@article{a76e2b84b77d4ccd867b14793733a047,

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 M. Demarteau",

year = "2002",

doi = "10.1103/PhysRevD.65.052008",

language = "English",

volume = "65",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "0556-2821",

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 - Demarteau, M.

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 - http://www.scopus.com/inward/record.url?scp=4244109876&partnerID=8YFLogxK

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 - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 5

M1 - 052008

ER -

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

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