Measurement of the forward backward asymmetry of c and b quarks at the Z pole using reconstructed D mesons

被引：13

作者：

Abreu, P ^{[1
]}

Adye, T

Adzic, P

Albrecht, Z

Alderweireld, T

Alekseev, GD

Alemany, R

Allmendinger, T

Allport, PP

Almehed, S

Amaldi, U

Amato, S

Anassontzis, EG

Andersson, P

Andreazza, A

Andringa, S

Antilogus, P

Apel, WD

Arnoud, Y

Åsman, B

Augustin, JE

Augustinus, A

Baillon, P

Bambade, P

Barao, F

Barbiellini, G

Barbier, R

Bardin, DY

Barker, G

Baroncelli, A

Battaglia, M

Baubillier, M

Becks, KH

Begalli, M

Beilliere, P

Belokopytov, Y

Belous, K

Benvenuti, AC

Berat, C

Berggren, M

Bertini, D

Bertrand, D

Besancon, M

Bianchi, F

Bigi, M

Bilenky, MS

Bizouard, MA

Bloch, D

Blom, HM

Bonesini, M

机构：

[1] Natl Tech Univ Athens, Dept Phys, Athens, Greece

[2] Iowa State Univ Sci & Technol, Dept Phys & Astron, Ames, IA 50011 USA

[3] Univ Instelling Antwerp, Dept Phys, BE-2610 Wilrijk, Belgium

[4] VUB, ULB, IIHE, BE-1050 Brussels, Belgium

[5] Univ Etat Mons, Fac Sci, BE-7000 Mons, Belgium

[6] Univ Athens, Phys Lab, GR-10680 Athens, Greece

[7] Univ Bergen, Dept Phys, N-5007 Bergen, Norway

[8] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy

[9] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[10] Ctr Brasileiro Pesquisas Fis, BR-22290 Rio De Janeiro, Brazil

[11] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22453 Rio De Janeiro, Brazil

[12] Univ Estadual Rio de Janeiro, Inst Fis, Rio De Janeiro, Brazil

[13] Comenius Univ, Fac Math & Phys, SK-84215 Bratislava, Slovakia

[14] Coll France, Phys Corpusculaire Lab, IN2P3, CNRS, F-75231 Paris 05, France

[15] CERN, CH-1211 Geneva 23, Switzerland

[16] ULP, CNRS, IN2P3, Inst Rech Subatom, F-67037 Strasbourg, France

[17] NCSR Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece

[18] CAS, Div High Energy Phys, FZU, Inst Phys, CZ-18040 Prague 8, Czech Republic

[19] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy

[20] Ist Nazl Fis Nucl, I-16146 Genoa, Italy

[21] Univ Grenoble 1, CNRS, IN2P3, Inst Nucl Sci, F-38026 Grenoble, France

[22] Helsinki Inst Phys, FI-00014 Helsinki, Finland

[23] Joint Nucl Res Inst, RU-101000 Moscow, Russia

[24] Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany

[25] Inst Nucl Phys, PL-30055 Krakow, Poland

[26] Univ Min & Met, PL-30055 Krakow, Poland

[27] Univ Paris 11, Accelerateur Lineaire Lab, IN2P3, CNRS, F-91405 Orsay, France

[28] Univ Lancaster, Sch Phys & Chem, Lancaster LA1 4YB, England

[29] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

[30] Univ Paris 06, CNRS, IN2P3, LPNHE, F-75252 Paris 05, France

[31] Univ Paris 07, F-75252 Paris 05, France

[32] Univ Lund, Dept Phys, SE-22363 Lund, Sweden

[33] Univ Lyon 1, IPNL, IN2P3, CNRS, F-69622 Villeurbanne, France

[34] Univ Aix Marseille 2, CPP, IN2P3, CNRS, F-13288 Marseille 09, France

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

[36] Ist Nazl Fis Nucl, I-20133 Milan, Italy

[37] Niels Bohr Inst, DK-2100 Copenhagen O, Denmark

[38] Charles Univ, MFF, Nucl Ctr, NC,Areal MFF, CZ-18000 Prague 8, Czech Republic

来源：

EUROPEAN PHYSICAL JOURNAL C | 1999年 / 10卷 / 02期

关键词：

D O I：

10.1007/s100520050584

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：

A measurement of the forward-backward asymmetry of e(+)e(-) --> c (c) over bar and e(+)e(-) --> b (b) over bar on the Z resonance is performed using about 3.5 million hadronic Z decays collected by the DELPHI detector at LEP in the years 1992 to 1995. The heavy quark is tagged by the exclusive reconstruction of several D meson decay modes. The forward-backward asymmetries for c and b quarks at the Z resonance are determined to be: A(FB)(c)(root s = 91.235 GeV) = 0.0659 +/- 0.0094(stat) +/- 0.0035(syst) A(FB)(b)(root s = 91.235 GeV) = 0.0762 +/- 0.0194(stat) +/- 0.0085(syst) A(FB)(c)(root s = 89.434GeV) = -0.0496 +/- 0.0368(stat) +/- 0.0053(syst) A(FB)(b)(root s = 89.434 GeV) = 0.0567 +/- 0.0756(stat) +/- 0.0117(syst) A(FB)(c)(root s = 92.990 GeV) = 0.1180 +/- 0.0318(stat) +/- 0.0062(syst) A(FB)(b)(root s = 92.990 GeV) = 0.0882 +/- 0.0633(stat) +/- 0.0122(syst) The combination of these results leads to an effective electroweak mixing angle of: sin(2) theta(eff)(lept) = 0.2332 +/- 0.0016.

引用

页码：219 / 237

页数：19

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