Search for single top production in e+e- collisions at √s up to 209 GeV

被引：47

作者：

Heister, A ^{[1
]}

ALEPH Collaboration

Schael, S

Barate, R

Brunelière, R

De Bonis, I

Decamp, D

Goy, C

Jezequel, S

Lees, JP

Martin, F

Merle, E

Minard, MN

Pietrzyk, B

Trocmé, B

Boix, G

Bravo, S

Casado, MP

Chmeissani, M

Crespo, JM

Fernandez, E

Fernandez-Bosman, M

Garrido, L

Graugés, E

Lopez, J

Martinez, M

Merino, G

Pacheco, A

Paneque, D

Ruiz, H

Colaleo, A

Creanza, D

De Filippis, N

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

机构：

[1] Rhein Westfal TH Aachen, Inst Phys, D-52056 Aachen, Germany

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

[3] Univ Autonoma Barcelona, Inst Fis dAltes Energies, E-08193 Bellaterra, Barcelona, Spain

[4] Ist Nazl Fis Nucl, Dipartmento Fis, Sez Bari, I-70126 Bari, Italy

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

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

[7] Univ Clermont Ferrand, Phys Corpusculaire Lab, IN2P3, CNRS, F-63177 Clermont Ferrand, France

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

[9] NCSR Demokritos, GR-15310 Athens, Greece

[10] Ecole Polytech, Lab Leprince Ringuet, IN2P3, CNRS, F-91128 Palaiseau, France

[11] Univ Florence, Dipartimento Fis, Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy

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

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

[14] Haverford Coll, Dept Phys, Haverford, PA 19041 USA

[15] Heidelberg Univ, Kirchhoff Inst Phys, D-69120 Heidelberg, Germany

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

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

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

[19] Catholic Univ Louvain, Dept Phys, Inst Nucl Phys, B-1348 Louvain, Belgium

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

[21] Univ Aix Marseille 2, Ctr Phys Particules Marseille, IN2P3, CNRS, F-13288 Marseille, France

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

[23] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

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

[25] Univ Paris 11, Accelerateur Lineaire Lab, IN2P3, CNRS, F-91898 Orsay, France

[26] Univ Pisa, Dipartimento Fis, Ist Nazl Fis Nucl, Sez Pisa, I-56010 Pisa, Italy

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

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

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

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

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

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

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

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

[35] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

[36] Univ Washington, Seattle, WA 98195 USA

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

[38] ETH Honggerberg, Inst Particle Phys, CH-8093 Zurich, Switzerland

[39] Dipartimento Fis, I-95129 Catania, Italy

[40] Ist Nazl Fis Nucl, Sez Catania, I-95129 Catania, Italy

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

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

[43] Univ Palermo, Dipartimento Fis & Tecnol Relat, I-90133 Palermo, Italy

[44] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[45] Univ Montpellier 2, Grp Astroparticules Montpellier, F-34095 Montpellier, France

来源：

PHYSICS LETTERS B | 2002年 / 543卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(02)02307-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Single top production via the flavour changing neutral current reactions e(+)e(-) --> (t) over barc, (t) over baru is searched for within the 214 pb(-1) of data collected by ALEPH at centre-of-mass energies between 204 and 209 GeV No deviation from the Standard Model expectation is observed and upper limits on the single top production cross sections are derived. The combination with data collected at lower centre-of-mass energies yields an upper limit on the branching ratio BR(t --> Zc) + BR(t --> Zu) < 14%, for BR(t --> gammac) + BR(t --> gammau) = 0 and m(t) = 174 GeV/c(2). (C) 2002 Elsevier Science B.V All rights reserved.

引用

页码：173 / 182

页数：10

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