A measurement of the b-quark mass from hadronic Z decays

被引：38

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

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

[3] Ist Nazl Fis Nucl, Dipartimento Fis, Sez Bari, 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, Phys Corpusculaire Lab, IN2P3, CNRS, F-63177 Clermont Ferrand, 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, 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 Mediterranee, IN2P3, CNRS, Ctr Phys Particules, F-13288 Marseille, France

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[33] Univ Washington, Seattle, WA 98195 USA

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

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

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

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

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

[39] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[40] Univ Barcelona, Barcelona 08208, Spain

来源：

EUROPEAN PHYSICAL JOURNAL C | 2000年 / 18卷 / 01期

关键词：

D O I：

10.1007/s100520000533

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：

Hadronic Z decay data taken with the ALEPH detector at LEP1 are used to measure the three-jet rate as well as moments of various event-shape variables. The ratios of the observables obtained from b-tagged events and from an inclusive sample are determined. The mass of the b. quark is extracted from a fit to the measured ratios using a next-to-leading order prediction including mass effects. Taking the first moment of the y(3) distribution, which is the observable with the smallest hadronization corrections and systematic uncertainties, the result is m(b)(M-z) = [3.27 +/- 0.22(stat) +/- 0.22(exp) +/- 0.38(had) +/- 0.16(theo)] GeV/c(2) . The measured ratio is alternatively employed to test the flavour independence of the strong coupling constant for b and light quarks.

引用

页码：1 / 13

页数：13

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