Measurement of the partial decay width R(b)(0)=Gamma(b(b)over-bar)/Gamma(had) of the Z with the DELPHI detector at LEP

被引：22

作者：

Abreu, P

Adam, W

Adye, T

Agasi, E

Ajinenko, I

Aleksan, R

Alekseev, GD

Alemany, R

Allport, PP

Almehed, S

Amaldi, U

Amato, S

Andreazza, A

Andrieux, ML

Antilogus, P

Apel, WD

Arnoud, Y

Asman, B

Augustin, JE

Augustinus, A

Baillon, P

Bambade, P

Barao, F

Barate, R

Barbi, M

Bardin, DY

Baroncelli, A

Barring, O

Barrio, JA

Bartl, W

Bates, MJ

Battaglia, M

Baubillier, M

Baudot, J

Becks, KH

Begalli, M

Beilliere, P

Belokopytov, Y

Benvenuti, AC

Berggren, M

Bertrand, D

Bianchi, F

Bigi, M

Bilenky, MS

Billoir, P

Bloch, D

Blume, M

Blyth, S

Bolognese, T

Bonesini, M

机构：

[1] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011

[2] IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011

[3] UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM

[4] VUB,ULB,IIHE,B-1050 BRUSSELS,BELGIUM

[5] UNIV MONS,FAC SCI,B-7000 MONS,BELGIUM

[6] UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE

[7] UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY

[8] UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY

[9] IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY

[10] CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL

[11] PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL

[12] UNIV ESTADUAL RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL

[13] COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,SK-84215 BRATISLAVA,SLOVAKIA

[14] COLL FRANCE,PHYS CORPUSCULAIRE LAB,CNRS,IN2P3,F-75231 PARIS 05,FRANCE

[15] CERN,CH-1211 GENEVA 23,SWITZERLAND

[16] ULP,CTR RECH NUCL,IN2P3,CNRS,F-67037 STRASBOURG,FRANCE

[17] NATL CTR SCI RES DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE

[18] ACAD SCI CZECH REPUBL,INST PHYS,FZU,DIV HIGH ENERGY PHYS,CR-18040 PRAGUE,CZECH REPUBLIC

[19] UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY

[20] IST NAZL FIS NUCL,I-16146 GENOA,ITALY

[21] UNIV GRENOBLE 1,INST NUCL SCI,CNRS,IN2P3,F-38026 GRENOBLE,FRANCE

[22] SEFT,HIGH ENERGY PHYS RES INST,FIN-00014 HELSINKI,FINLAND

[23] JOINT INST NUCL RES,DUBNA 101000,RUSSIA

[24] UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY

[25] INST NUCL PHYS,PL-30055 KRAKOW,POLAND

[26] UNIV MIN & MET KRAKOW,PL-30055 KRAKOW,POLAND

[27] UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,CNRS,IN2P3,F-91405 ORSAY,FRANCE

[28] UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND

[29] UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND

[30] LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN

[31] UNIV LYON 1,IPNL,CNRS,IN2P3,F-69622 VILLEURBANNE,FRANCE

[32] UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN

[33] UNIV AIX MARSEILLE 2,CPP,CNRS,IN2P3,F-13288 MARSEILLE 09,FRANCE

[34] UNIV PARIS 06,LPHNE,CNRS,IN2P3,F-75252 PARIS 05,FRANCE

[35] UNIV PARIS 07,LPHNE,CNRS,IN2P3,F-75252 PARIS 05,FRANCE

[36] UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY

[37] IST NAZL FIS NUCL,I-20133 MILAN,ITALY

[38] NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK

[39] NIKHEF H,NL-1009 DB AMSTERDAM,NETHERLANDS

[40] NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE

[41] UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY

[42] CHARLES UNIV,MFF,NUCL CTR,CR-18000 PRAGUE 8,CZECH REPUBLIC

[43] UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN

[44] UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND

[45] UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY

[46] IST NAZL FIS NUCL,I-35131 PADUA,ITALY

[47] RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND

[48] UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY

[49] IST NAZL FIS NUCL,I-00173 ROME,ITALY

[50] CENS,DAPNIA,DSM,F-91191 GIF SUR YVETTE,FRANCE

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1996年 / 70卷 / 04期

关键词：

D O I：

10.1007/s002880050131

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：

The partial decay width of the Z to <b(b)over bar> quark pairs has been measured by the DELPHI detector at LEP. B-hadrons, containing b-quarks, were tagged by several methods using tracks with large impact parameters to the primary vertex complemented sometimes by event shape variables or using leptons with high transverse momentum relative to the hadron, In order to reduce the systematic uncertainties, in all methods the b-tagging efficiency has been extracted directly from the data. Combining all methods, the value: Gamma(<b(b)over bar>)/Gamma(had) = 0.2216 +/- 0.0016(stat.) +/- 0.0021(syst.) was found, where the <c(c)over bar> production fraction was fixed to its Standard Model value.

引用

页码：531 / 547

页数：17

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