Measurement of the Z resonance parameters at LEP

被引:37
作者
Barate, R [1 ]
Decamp, D
Ghez, P
Goy, C
Lees, JP
Lucotte, A
Merle, E
Minard, MN
Pietrzyk, B
Alemany, R
Casado, MP
Chmeissani, M
Comas, P
Crespo, JM
Fernandez, E
Fernandez-Bosman, M
Garrido, L
Graugès, E
Juste, A
Martinez, M
Merino, G
Miquel, R
Mir, LM
Orteu, S
Pacheco, A
Park, IC
Perlas, J
Riu, I
Sanchez, F
Colaleo, A
Creanza, D
de Palma, M
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
机构
[1] CNRS, IN2P3, Phys Particules Lab, LAPP, Annecy Le Vieux, France
[2] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Bellaterra, Barcelona, Spain
[3] Ist Nazl Fis Nucl, Sez 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 Blaise Pascal, CNRS, IN2P3, Phys Corpusculaire Lab, F-63177 Aubiere, France
[7] Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[8] Democritos Nucl Res Ctr, Athens 15310, Greece
[9] Ecole Polytech, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies, F-91128 Palaiseau, France
[10] Univ Florence, Ist Nazl Fis Nucl, Sez Firenze, Dipartimento Fis, I-50125 Florence, Italy
[11] Florida State Univ, Supercomp Computat Res Inst, Tallahassee, FL 32306 USA
[12] Ist Nazl Fis Nucl, Lab Nazl Frascati, 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, CNRS, IN2P3, Ctr Phys Particules, F-13288 Marseille, France
[20] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[21] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
[22] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst Phys, D-80805 Munich, Germany
[23] Univ Paris 11, CNRS, IN2P3, Lab Accelerateur Lineaire, F-91898 Orsay, France
[24] Univ Pisa, Ist Nazl Fis Nucl, Sez Pisa, Dipartimento Fis, 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] CE Saclay, Serv Phys Particules, DAPNIA, CEA, 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] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy
[34] Univ Washington, Seattle, WA 98195 USA
[35] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[36] Ist Nazl Fis Nucl, Sez Catania, Ctr Siciliano Fis Nucl & Struttura Mat, I-95129 Catania, Italy
[37] Univ Turin, Ist Fis Gen, I-10125 Turin, Italy
来源
EUROPEAN PHYSICAL JOURNAL C | 2000年 / 14卷 / 01期
关键词
D O I
10.1007/s100520000319
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
The properties of the Z resonance are measured from the analysis of 4.5 million Z decays into fermion pairs collected with the ALEPII detector at LEP. The data are consistent with lepton universality. The resonance parameters are measured to be M-Z = (91.1885 +/- 0.0031) GeV/c(2), Gamma(Z) = (2.4941 +/- 0.0043) GeV, sigma(had)(0) = (41.559 +/- 0.058) nb and, combining the three lepton flavours, R-l = 20.725 +/- 0.039. The corresponding number of light neutrino species is N-v = 2.983 +/- 0.013 and the strong coupling constant is alpha(s)(M-Z) = 0.114 +/- 0.004 +/- 0.002(QCD) + 0.005 log(10) [M-H/150 GeV/c(2)]. The lepton pair forward-backward asymmetry is measured to be A(FB)(0,l) = 0.0173 +/- 0.0016 from which the effective weak mixing angle is described: sin(2) theta(eff)(lept) = 0.23089 +/- 0.00089. The measurement of the leptonic width Gamma(ll) = 84.02 +/- 0.15 MeV leads to a determination of the effective rho parameter rho(eff)(lept) = 1.0064 +/- 0.0018. The data support the Standard Model and favour a light Higgs.
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页码:1 / 50
页数:50
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