Measurement of AbFB using inclusive b-hadron decays

被引：0

作者：

Heister, A ^{[1
]}

Schael, S

Barate, R

De Bonis, I

Decamp, D

Goy, C

Lees, JP

Merle, E

Minard, AN

Pietrzyk, B

Bravo, S

Casado, MP

Chmeissani, M

Crespo, JM

Fernandez, E

Fernandez-Bosman, M

Garrido, L

Graugés, E

Martinez, M

Merino, G

Miquel, R

Mir, LM

Pacheco, A

Ruiz, H

Colalco, 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

Xue, S

Zhang, J

Zhang, L

Zhao, W

Abbaneo, D

机构：

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

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

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

[4] Ist Nazl Fis Nucl, Sez Bari, Dipartimento Fis, 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, CNRS, IN2P3, F-63177 Clermont Ferrand, Aubiere, France

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

[9] Democritos Nucl Res Ctr, Athens 15310, Greece

[10] Ecole Polytech, Lab Phys Nucl & Hautes Energies, CNRS, IN2P3, 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] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[20] Univ Mediterranee, Ctr Phys Particules, CNRS, IN2P3, F-13288 Marseille, France

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

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

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

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

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

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

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

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

[29] Ctr Etud Saclay, Serv Phys Particules, DAPNIA, CEA, F-91191 Gif Sur Yvette, France

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

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

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

[33] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

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

[35] Univ Washington, Seattle, WA 98195 USA

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

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

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

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

[40] Univ Barcelona, Barcelona 08208, Spain

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

[42] Univ Palermo, Dipartimento Fis & Tecnol Relat, Palermo, Italy

来源：

EUROPEAN PHYSICAL JOURNAL C | 2001年 / 22卷 / 02期

关键词：

D O I：

10.1007/s100520100812

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：

Based on a sample of four million events collected by ALEPH from 1991 to 1995, a measurement of the forward-backward asymmetry in Z --> b (b) over bar decays using inclusive final states is presented. High-performance tagging of b (b) over bar events in a wide angular range is achieved using neural network techniques. An optimal hemisphere charge estimator is built by merging primary and secondary vertex information, leading kaon identification and jet charge in a neural network. The average charge asymmetry, the flavour tagging efficiencies and mean b-hemisphere charges are measured from data and used to extract the pole b asymmetry in the Standard Model A(FB)(o,b) = 0.1011 +/- 0.0012 (syst), corresponding to a value of the effective weak mixing angle of sin(2)theta(W)(eff) = 0.23189 +/- 0.00056.

引用

页码：201 / 215

页数：15

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