Subjet multiplicity of gluon and quark jets reconstructed with the k⊥ algorithm in p(p)over-bar collisions -: art. no. 052008

被引：29

作者：

Abazov, VM ^{[1
]}

Abbott, B

Abdesselam, A

Abolins, M

Abramov, V

Acharya, BS

Adams, DL

Adams, M

Ahmed, SN

Alexeev, GD

Alton, A

Alves, GA

Amos, N

Anderson, EW

Arnoud, Y

Avila, C

Baarmand, MM

Babintsev, VV

Babukhadia, L

Bacon, TC

Baden, A

Baldin, B

Balm, PW

Banerjee, S

Barberis, E

Baringer, P

Barreto, J

Bartlett, JF

Bassler, U

Bauer, D

Bean, A

Beaudette, F

Begel, M

Belyaev, A

Beri, SB

Bernardi, G

Bertram, I

Besson, A

Beuselinck, R

Bezzubov, VA

Bhat, PC

Bhatnagar, V

Bhattacharjee, M

Blazey, G

Blekman, F

Blessing, S

Boehnlein, A

Bojko, NI

Borcherding, F

Bos, K

机构：

[1] Joint Inst Nucl Res, Dubna, Russia

[2] Univ Buenos Aires, Buenos Aires, DF, Argentina

[3] Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil

[4] Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil

[5] Inst High Energy Phys, Beijing 100039, Peoples R China

[6] Univ Los Andes, Bogota, Colombia

[7] Charles Univ Prague, Ctr Particle Phys, Prague, Czech Republic

[8] Acad Sci Czech Republ, Inst Phys, Ctr Particle Phys, Prague, Czech Republic

[9] Univ San Francisco Quito, Quito, Ecuador

[10] Univ Grenoble 1, CNRS, IN2P3, Inst Sci Nucl, Grenoble, France

[11] Univ Mediterranee, CNRS, IN2P3, CPPM, Marseille, France

[12] IN2P3, CNRS, Lab Accelerateur Lineaire, Orsay, France

[13] Univ Paris 06, LPNHE, Paris, France

[14] Univ Paris 07, CNRS, IN2P3, Paris, France

[15] CEA, DAPNIA, Serv Phys Particules, Saclay, France

[16] Johannes Gutenberg Univ Mainz, Inst Phys, D-6500 Mainz, Germany

[17] Panjab Univ, Chandigarh 160014, India

[18] Univ Delhi, Delhi 110007, India

[19] Tata Inst Fundamental Res, Mumbai, India

[20] Seoul Natl Univ, Seoul, South Korea

[21] CINVESTAV, Mexico City 14000, DF, Mexico

[22] NIKHEF H, FOM Inst, NL-1009 DB Amsterdam, Netherlands

[23] Univ Amsterdam, NIKHEF, Amsterdam, Netherlands

[24] Univ Nijmegen, NIKHEF, Nijmegen, Netherlands

[25] Inst Phys Nucl, Krakow, Poland

[26] Inst Theoret & Expt Phys, Moscow 117259, Russia

[27] Moscow MV Lomonosov State Univ, Moscow, Russia

[28] Inst High Energy Phys, Protvino, Russia

[29] Univ Lancaster, Lancaster, England

[30] Univ London Imperial Coll Sci Technol & Med, London, England

[31] Univ Arizona, Tucson, AZ 85721 USA

[32] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[33] Univ Calif Davis, Davis, CA 95616 USA

[34] Calif State Univ Fresno, Fresno, CA 93740 USA

[35] Univ Calif Irvine, Irvine, CA 92697 USA

[36] Univ Calif Riverside, Riverside, CA 92521 USA

[37] Florida State Univ, Tallahassee, FL 32306 USA

[38] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[39] Univ Illinois, Chicago, IL 60607 USA

[40] No Illinois Univ, De Kalb, IL 60115 USA

[41] Northwestern Univ, Evanston, IL 60208 USA

[42] Indiana Univ, Bloomington, IN 47405 USA

[43] Univ Notre Dame, Notre Dame, IN 46556 USA

[44] Iowa State Univ, Ames, IA 50011 USA

[45] Univ Kansas, Lawrence, KS 66045 USA

[46] Kansas State Univ, Manhattan, KS 66506 USA

[47] Louisiana Tech Univ, Ruston, LA 71272 USA

[48] Univ Maryland, College Pk, MD 20742 USA

[49] Boston Univ, Boston, MA 02215 USA

[50] Northeastern Univ, Boston, MA 02115 USA

来源：

PHYSICAL REVIEW D | 2002年 / 65卷 / 05期

关键词：

D O I：

10.1103/PhysRevD.65.052008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The D empty set 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(perpendicular to)) of energy clusters. Using the standard value D = 1.0 of the jet-separation parameter in the k(perpendicular to) 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) approximate to90 (240) GeV. To examine internal jet structure, the k(perpendicular to) algorithm is applied within D = 0.5 jets to resolve any subjets. The multiplicity of subjets in jet samples at roots = 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.

引用

页数：20

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