Study of the CP asymmetry of B0 → J/ψ KS0 decays in ALEPH

被引：56

作者：

Barate, R ^{[1
]}

Decamp, D

Ghez, P

Goy, C

Lees, JP

Merle, E

Minard, MN

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

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

Xue, S

Zhang, J

Zhang, L

Zhao, W

Abbaneo, D

Boix, G

Buchmüller, O

机构：

[1] CNRS, IN2P3, LAPP, Phys Particules Lab, F-74019 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 Clermont Ferrand, CNRS, IN2P3, Phys Corpusculaire Lab, F-63177 Aubiere, France

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

[8] NRCD, GR-15310 Athens, Greece

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

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

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

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

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

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

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

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

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

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

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

[20] Ist Nazl Fis Nucl, Sez Mil, I-20133 Milan, Italy

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

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

[23] Univ Pisa, Dipartimento Fis, I-56010 Pisa, Italy

[24] Ist Nazl Fis Nucl, Sez 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] 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 Wisconsin, Dept Phys, Madison, WI 53706 USA

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

[36] Univ Catania, Dipartmento Fis, I-95129 Catania, Italy

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

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

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

来源：

PHYSICS LETTERS B | 2000年 / 492卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(00)01091-1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The decay B-0 --> J/psi K-S(0) is reconstructed with J/psi --> e(+)e(-) or mu (+)mu (-) and K-S(0) --> pi (+)pi (-). From the full ALEPH dataset at LEP1 of about 4 million hadronic Z decays, 23 candidates are selected with an estimated purity of 71%, They are used to measure the CP asymmetry of this decay, given by sin 2 beta in the Standard Model, with the result sin 2 beta = 0.84(-1.04)(+0.82) +/- 0.16. This is combined with existing measurements from other experiments, and increases the confidence level that CP violation has been observed in this channel to 98%. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：259 / 274

页数：16

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