A measurement of the gluon splitting rate into b(b)over-bar pairs in hadronic Z decays

被引：39

作者：

Barate, R ^{[1
]}

Buskulic, D

Decamp, D

Ghez, P

Goy, C

Lees, JP

Lucotte, A

Merle, E

Minard, MN

Nief, JY

Pietrzyk, B

Alemany, R

Boix, G

Casado, MP

Chmeissani, M

Crespo, JM

Delfino, M

Fernandez, E

Fernandez-Bosman, M

Garrido, L

Grauges, E

Juste, A

Martinez, M

Merino, G

Miquel, R

Mir, LM

Park, IC

Pascual, A

Riu, I

Sanchez, F

Colaleo, A

Creanza, D

de Palma, M

Gelao, G

Iaselli, G

Maggi, G

Maggi, M

Nuzzo, S

Ranieri, A

Raso, G

Ruggieri, F

Selvaggi, G

Silvestris, L

Tempesta, P

Tricomi, A

Zito, G

Huang, X

Lin, J

Ouyang, Q

Wang, T

机构：

[1] IN2P3, CNRS, Phys Particules Lab, LAPP, F-74019 Annecy Le Vieux, France

[2] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain

[3] Ist Nazl Fis Nucl, Dipartimento Fis, Sezione Bari, I-70126 Bari, Italy

[4] Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China

[5] CERN, European Lab Particle Phys, CH-1211 Geneva 23, Switzerland

[6] Univ Blaise Pascal, Phys Corpusculaire Lab, IN2P3, CNRS, F-63177 Clermont Ferrand, France

[7] Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[8] Democritos Nucl Res Ctr, NRCD, GR-15310 Athens, Greece

[9] Ecole Polytech, Lab Phys Nucl & Hautes Energies, F-91128 Palaiseau, France

[10] Univ Firenze, Dipartimento Fis, INFN, Sezione Firenze, I-50125 Florence, Italy

[11] Florida State Univ, Supercomp Computat Res Inst, Tallahassee, FL 32306 USA

[12] Ist Nazl Fis Nucl, Lab Nazl Frascati, INFN, LNF, I-00044 Frascati, Italy

[13] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[14] Heidelberg Univ, Inst Hochenergiephys, D-69120 Heidelberg, Germany

[15] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BZ, England

[16] Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria

[17] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England

[18] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[19] Fac Sci Luminy, IN2P3, Ctr Phys Particules, CNRS, F-13288 Marseille, France

[20] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[21] Ist Nazl Fis Nucl, Sezione Milano, I-20133 Milan, Italy

[22] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany

[23] Univ Paris Sud, Lab Accelerateur Lineaire, IN2P3, CNRS, F-91898 Orsay, France

[24] Univ Pisa, Dipartimento Fis, INFN, Sezione Pisa, I-56010 Pisa, Italy

[25] Scuola Normale Super Pisa, I-56010 Pisa, Italy

[26] Univ London Royal Holloway & Bedford New Coll, Dept Phys, Egham TW20 0EX, Surrey, England

[27] Rutherford Appleton Lab, Particle Phys Dept, Didcot OX11 0QX, Oxon, England

[28] CENS, CEA, DAPNIA, Serv Phys Particules, F-91191 Gif Sur Yvette, France

[29] Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA

[30] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England

[31] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany

[32] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy

[33] INFN, Sezione Trieste, I-34127 Trieste, Italy

[34] Univ Washington, Seattle, WA 98195 USA

[35] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[36] Kangnung Natl Univ, Kangnung, South Korea

[37] Univ Barcelona, E-08028 Barcelona, Spain

[38] Ist Nazl Fis Nucl, Dipartimento Fis, Sezione Catania, I-95129 Catania, Italy

[39] Univ Turin, Ist Fis Gen, Turin, Italy

[40] CNR, Ist Cosmogeofis, I-10133 Turin, Italy

[41] CERN, CH-1211 Geneva 23, Switzerland

来源：

PHYSICS LETTERS B | 1998年 / 434卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(98)00850-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A measurement of the fraction of hadronic Z decays in which a, gluon splits into a b (b) over bar pair, g(<b(b)over bar>), is presented using data collected by ALEPH from 1992 to 1995 at the Z resonance. The selection is based on four-jet events. Events are selected by means of topological cuts and a lifetime tag. The result is g(<b(b)over bar>) = (2.77 +/- 0.42(stat) +/- 0.57(syst)) x 10(-3). (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：437 / 450

页数：14

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