Measurement of W-pair production in e+e- collisions at 183 GeV

被引：23

作者：

Barate, R ^{[1
]}

Decamp, D

Ghez, P

Goy, C

Jezequel, S

Lees, JP

Martin, F

Merle, E

Minard, MN

Pietrzyk, B

Alemany, R

Casado, MP

Chmeissani, M

Crespo, JM

Fernandez, E

Fernandez-Bosman, M

Garrido, L

Graugès, E

Juste, A

Martinez, M

Merino, G

Miquel, R

Mir, LM

Morawitz, P

Pacheco, A

Park, IC

Riu, I

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

Xie, Y

Xu, R

Xue, S

机构：

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

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

[3] Ist Nazl Fis Nucl, Sezione Bari, Dipartimento Fis, 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 Clermont Ferrand, Phys Corpusculaire Lab, CNRS, IN2P3, F-63177 Aubiere, France

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

[8] NRCD, GR-15310 Athens, Greece

[9] Ecole Polytech, Lab Phys Nucl & Hautes Energies, CNRS, IN2P3, F-91128 Palaiseau, France

[10] Univ Florence, Dipartimento Fis, Ist Nazl Fis Nucl, Sezione Firenze, I-50125 Florence, Italy

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

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

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

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

[20] Univ Milan, Dept Fis, Ist Nazl Fis Nucl, Sezione Milano, I-20133 Milan, Italy

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

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

[23] Univ Pisa, Sezione Pisa, Dipartimento Fis, Ist Nazl Fis Nucl,Scuola Normale Superiore, I-56010 Pisa, Italy

[24] Univ London, Royal Holloway & Bedford New Coll, Dept Phys, Surrey TW20 OEX, England

[25] Rutherford Appleton Lab, Particle Phys Dept, Didcot OX11 OQX, Oxon, England

[26] CEA, DAPNIA, Serv Phys Particules, CE Saclay, F-91191 Gif Sur Yvette, France

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

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

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

[30] Univ Trieste, Dipartimento Fis, Ist Nazl Fis Nucl, Sezione Trieste, I-34127 Trieste, Italy

[31] Univ Washington, Expt Elementary Particle Phys, Seattle, WA 98195 USA

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

[33] Univ Barcelona, Barcelona 08208, Spain

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

[35] Univ Turin, Ist Fis Gen, I-10125 Turin, Italy

[36] CNR, Ist Cosmo Geofis, Turin, Italy

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

来源：

PHYSICS LETTERS B | 1999年 / 453卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(99)00304-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The production of W+W- pairs is analysed in a data sample collected by ALEPH at a mean centre-of-mass energy of 182.7 GeV, corresponding to an integrated luminosity of 57 pb(-1). Cross sections are given for different topologies of W decays into leptons or hadrons. Under Standard Model assumptions for the W-pair production and decay, the W-pair cross section is measured to be 15.57 +/- 0.62 (stat.) +/- 0.29 (syst.) ph. Using also the W-pair data samples collected by ALEPH at lower centre-of-mass energies, the decay branching ratio of the W boson into hadrons is measured to be B(W --> hadrons) = 68.93 +/- 1.21 (stat.) +/- 0.51 (syst.)%, allowing a determination of the CKM matrix element /V-cs/ = 1.043 +/- 0.058 (stat.) +/- 0.026 (syst.). The agreement of the cross sections with the Standard Model prediction allows a limit to be set on the W decay rate to undetectable final states. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：107 / 120

页数：14

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