MEASUREMENT OF THE RATIO GAMMA-B(B)BAR/GAMMA HAD USING EVENT SHAPE VARIABLES

被引：25

作者：

BUSKULIC, D

DEBONIS, I

DECAMP, D

GHEZ, P

GOY, C

LEES, JP

MINARD, MN

PIETRZYK, B

ARIZTIZABAL, F

COMAS, P

CRESPO, JM

DELFINO, M

EFTHYMIOPOULOS, I

FERNANDEZ, E

FERNANDEZBOSMAN, M

GAITAN, V

GARRIDO, L

MATTISON, T

PACHECO, A

PADILLA, C

PASCUAL, A

CREANZA, D

DEPALMA, M

FARILLA, A

IASELLI, G

MAGGI, G

NATALI, S

NUZZO, S

QUATTROMINI, M

RANIERI, A

RASO, G

ROMANO, F

RUGGIERI, F

SELVAGGI, G

SILVESTRIS, L

TEMPESTA, P

ZITO, G

CHAI, Y

HU, H

HUANG, D

HUANG, X

LIN, J

WANG, T

XIE, Y

XU, D

XU, R

ZHANG, J

ZHANG, L

ZHAO, W

BLUCHER, E

机构：

[1] CNR, IST COSM GEOPHYS, TURIN, ITALY

[2] CERN, DIV PPE, CH-1211 GENEVA 23, SWITZERLAND

[3] UNIV NAPLES, DIPARTIMENTO SCI FIS, I-80138 NAPLES, ITALY

[4] UNIV SASSARI, IST MATEMAT & FIS, I-07100 SASSARI, ITALY

[5] UNIV AUTONOMA BARCELONA, IST FIS ALTES ENERGIES, E-08193 BARCELONA, SPAIN

[6] INFN, SEZ BARI, I-70126 BARI, ITALY

[7] UNIV BARI, DIPARTIMENTO FIS, I-70126 BARI, ITALY

[8] CHINESE ACAD SCI, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA

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

[10] UNIV CLERMONT FERRAND, IN2P3, CNRS, PHYS CORPUSCULAIRE LAB, F-63177 CLERMONT FERRAND, FRANCE

[11] NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK

[12] DEMOKRITOS NATL CTR SCI RES, GR-15310 ATHENS, GREECE

[13] ECOLE POLYTECH, PHYS NUCL & HAUTES ENERGIES LAB, F-91128 PALAISEAU, FRANCE

[14] UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND

[15] UNIV FLORENCE, INFN, DIPARTIMENTO FIS, SEZ FIRENZE, I-50125 FLORENCE, ITALY

[16] FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA

[17] FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA

[18] INFN, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY

[19] UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND

[20] UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY

[21] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND

[22] UNIV INNSBRUCK, DEPT EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA

[23] UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND

[24] UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY

[25] FAC SCI LUMINY, IN2P3, CNRS, CTR PHYS PARTICULES, F-13288 MARSEILLE 9, FRANCE

[26] MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, W-8000 MUNICH, GERMANY

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

[28] UNIV PISA, INFN, SEZ PISA, I-56010 PISA, ITALY

[29] SCUOLA NORMALE SUPER PISA, I-56010 PISA, ITALY

[30] UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, EGHAM TW20 0EX, SURREY, ENGLAND

[31] RUTHERFORD APPLETON LAB, DEPT PARTICLE PHYS, DIDCOT OX11 0QX, OXON, ENGLAND

[32] CE SACLAY, DAPNIA, SERV PHYS PARTICULES, F-91191 GIF SUR YVETTE, FRANCE

[33] UNIV CALIF SANTA CRUZ, INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA

[34] UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, S YORKSHIRE, ENGLAND

[35] UNIV GESAMTHSCH SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN 21, GERMANY

[36] UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY

[37] INFN, SEZ TRIESTE, I-34127 TRIESTE, ITALY

[38] UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA

[39] UNIV WASHINGTON, SEATTLE, WA 98195 USA

[40] UNIV TURIN, IST FIS GEN, I-10124 TURIN, ITALY

来源：

PHYSICS LETTERS B | 1993年 / 313卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(93)90029-H

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The branching fraction of Z --> bbBAR relative to all hadronic decays of the Z has been measured using event shape variables to preferentially select Z --> bbBAR events. The method chosen applies a combination of shape discriminators and the selection of high transverse momentum leptons to event hemispheres. From a sample of 440000 hadronic Z decays collected with the ALEPH detector at LEP, the ratio GAMMA(bbBAR)/GAMMA(had) = 0.228+/-0.005(stat.)+/-0.005(syst.) is measured.

引用

页码：549 / 563

页数：15

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