STUDY OF THE LEPTONIC DECAYS OF THE Z0 BOSON

被引：28

作者：

AARNIO, P

ABREU, P

ADAM, W

ADAMI, F

ADRIANOS, P

ADYE, T

ALEKSEEV, GD

ALLABY, JV

ALLEN, P

ALMEHED, S

ALVSVAAG, SJ

AMALDI, U

ANASSONTZIS, E

ANTILOGUS, P

APEL, WD

ASMAN, B

ASTESAN, F

FERRERES, CA

AUGUSTIN, JE

AUGUSTINUS, A

BAILLON, P

BARAO, F

BARBIELLINI, G

BARDIN, DY

BARLAG, S

BARLOW, J

BARONCELLI, A

BARRANCOLUQUE, M

BARREIRA, G

BARRING, O

BARTL, W

BATES, MJ

BATYUNIA, BV

BAUBILLIER, M

BECKS, KH

BEESTON, CJ

BELL, W

BELOKOPYTOV, I

BELTRAN, P

BENEDIC, D

BENLLOCH, JM

BERGGREN, M

BERTRAND, D

BIAGI, S

BIANCHI, F

BIBBY, JH

BILLOIR, P

BINGEFORS, N

BJARNE, J

BLOCH, D

机构：

[1] LISBOA INST POLITECN,P-1000 LISBON,PORTUGAL

[2] UNIV PADUA,DEPARTIMENTO FIS,I-35131 PADUA,ITALY

[3] IST NAZL FIS NUCL,PADUA,ITALY

[4] AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA

[5] CENS,DEPT HIGH ENERGY PHYS,F-91191 GIF SUR YVETTE,FRANCE

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

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

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

[9] UNIV VALENCIA,CSIC,CTR MIXTO,INST FIS CORPUSCULAR,E-4600 BURJASSOT,SPAIN

[10] DUBNA JOINT NUCL RES INST,MOSCOW 101000,USSR

[11] UNIV MILAN,DEPARTIMENTO FIS,I-20133 MILAN,ITALY

[12] NATL INST NUCL PHYS,MILAN,ITALY

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

[14] UNIV BERGEN,DEPT PHYS,N-500 BERGEN,NORWAY

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

[16] UNIV PARIS 11,ACCELERATOR LINEAIRE LAB,F-91405 ORSAY,FRANCE

[17] UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE,GERMANY

[18] UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN

[19] UNIV COPENHAGEN,NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK

[20] UNIV PARIS 07,F-75221 PARIS 05,FRANCE

[21] UNIV PARIS 06,PHYS NUCL HAUTE ETUD LAB,F-75230 PARIS 05,FRANCE

[22] UNIV SANTANDER,FAC CIENCIAS,E-3900 SANTANDER,SPAIN

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

[24] UNIV TRIESTE,DEPARTIMENTO FIS,I-34127 TRIESTE,ITALY

[25] IST NAZL FIS NUCL,TRIESTE,ITALY

[26] UNIV UDINE,IST FIS,I-33100 UDINE,ITALY

[27] IST SUPER SANITA,IST NAZL FIZ NUCL,I-00161 ROME,ITALY

[28] UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY

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

[30] UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND

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

[32] SERPUKHOV HIGH ENERGY PHYS INST,SERPUKHOV 142284,USSR

[33] DEMOCRITOS NUCL RES CTR,GREEK ATOM ENERGY COMMISS,GR-15310 ATHENS,GREECE

[34] GRP DELPHI,CTR RECH NUCL,DIV HAUTES ENERGIES,F-67037 STRASBOURG,FRANCE

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

[36] UNIV LIBRE BRUXELLES,B-1050 BRUSSELS,BELGIUM

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

[38] UNIV WARSAW,PL-00681 WARSAW,POLAND

[39] UNIV ETAT MONS,FAC SCI,SERV PHYS PARTICULES ELEMENTAIRES,B-7000 MONS,BELGIUM

[40] UNIV BOLOGNA,HOSP FIS,I-40126 BOLOGNA,ITALY

[41] UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND

[42] IST NAZL FIS NUCL,TURIN,ITALY

[43] UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY

[44] UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN

[45] IST NAZL FIS NUCL,BOLOGNA,ITALY

[46] NATL INST HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS

[47] COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE

[48] IST NAZL FIS NUCL,GENOA,ITALY

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

[50] INST NUCL STUDIES,WARSAW,POLAND

来源：

PHYSICS LETTERS B | 1990年 / 241卷 / 03期

关键词：

D O I：

10.1016/0370-2693(90)91667-Z

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Measurements are presented of the cross section ratios Rℓ= σℓ(e+e-→ℓ+ ℓ-) σh(e for ℓ=e, μ and τ using data taken from a scan around the Z0. The results are Re=(5.09±o.32±0.18)%, Rμ=(0.46±0.35±0.17)% and Rτ=(4.72±0.38±0.29)% where, for the ratio Re, the t-channel contribution has been subtracted. These results are consistent with the hypothesis of lepton universality and test this hypothesis at the energy scale s∼8300 GeV2. The absolute cross sections σℓ(e+e-→ℓ+ ℓ-) have also been measured. From the cross sections the leptonic partial widths Γe=(83.2±3.0±2.4) MeV, (ΓeΓμ) 1 2=(84.6±3.0±2.4) MeV and (ΓeΓτ) 1 2=(82.6±3.3±3.2) MeV have been extracted. Assuming lepton universality the ratio Γℓ Γh=(4.89±0.20±0.12) × 10-2 w was obtained, together with Γℓ=(83.6±1.8±2.2) MeV. The number of light neutrino species is determined to be Nv=3.12±0.24±0.25. Al the data are consistent with the predictions of the standard model. © 1990.

引用

页码：425 / 434

页数：10

共 19 条

[1] STUDY OF INTERMITTENCY IN ELECTRON POSITRON-ANNIHILATION INTO HADRONS [J].

BRAUNSCHWEIG, W ;

GERHARDS, R ;

KIRSCHFINK, FJ ;

MARTYN, HU ;

FISCHER, HM ;

HARTMANN, H ;

HARTMANN, J ;

HILGER, E ;

JOCKSCH, A ;

WEDEMEYER, R ;

FOSTER, B ;

MARTIN, AJ ;

BERNARDI, E ;

CHWASTOWSKI, J ;

ESKREYS, A ;

GENSER, K ;

HULTSCHIG, H ;

JOOS, P ;

KOWALSKI, H ;

LADAGE, A ;

LOHR, B ;

LUKE, D ;

NOTZ, D ;

PAWLAK, JM ;

POSNECKER, KU ;

ROS, E ;

TRINES, D ;

WALCZAK, R ;

WOLF, G ;

KOLANOSKI, H ;

KRACHT, T ;

KRUGER, J ;

LOHRMANN, E ;

POELZ, G ;

ZEUNER, W ;

BINNIE, D ;

HASSARD, J ;

SHULMAN, J ;

SU, D ;

TOMALIN, I ;

BARREIRO, F ;

LEITES, A ;

DELPESO, J ;

BURROWS, PN ;

HEATH, GP ;

VEITCH, ME ;

HART, JC ;

SAXON, DH ;

BRANDT, S ;

HOLDER, M .

PHYSICS LETTERS B, 1989, 231 (04) :548-556

[2]

AARNIO P, 1990, PHYS LETT B, V241, P435

[3]

ABRAMS GS, 1989, SLACPUB5124 PREPR

[4] A MEASUREMENT OF THE Z0 LEPTONIC PARTIAL WIDTHS AND THE VECTOR AND AXIAL-VECTOR COUPLING-CONSTANTS [J].

ADEVA, B ;

ADRIANI, O ;

AGUILARBENITEZ, M ;

AKBARI, H ;

ALCARAZ, J ;

ALOISIO, A ;

ALVERSON, G ;

ALVIGGI, MG ;

AN, Q ;

ANDERHUB, H ;

ANDERSON, AL ;

ANDREEV, VP ;

ANGELOV, T ;

ANTONOV, L ;

ANTREASYAN, D ;

AREFIEV, A ;

AZEMOON, T ;

AZIZ, T ;

BABA, PVKS ;

BAGNAIA, P ;

BAKKEN, JA ;

BAKSAY, L ;

BALL, RC ;

BANERJEE, S ;

BAO, J ;

BARONE, L ;

BAY, A ;

BECKER, U ;

BEINGESSNER, S ;

BENCZE, GL ;

BERDUGO, J ;

BERGES, P ;

BERTUCCI, B ;

BETEV, BL ;

BILAND, A ;

BIZZARRI, R ;

BLAISING, JJ ;

BLOMEKE, P ;

BLUMENFELD, B ;

BOBBINK, GJ ;

BOCCIOLINI, M ;

BOHLEN, W ;

BOHM, A ;

BOHRINGER, T ;

BORGIA, B ;

BOURILKOV, D ;

BOURQUIN, M ;

BOUTIGNY, D ;

BRANSON, JG ;

BROCK, IC .

PHYSICS LETTERS B, 1990, 238 (01) :122-130

[5] A COMBINED ANALYSIS OF THE HADRONIC AND LEPTONIC DECAYS OF THE Z0 [J].

AKRAWY, MZ ;

ALEXANDER, G ;

ALLISON, J ;

ALLPORT, PP ;

ANDERSON, KJ ;

ARMITAGE, JC ;

ARNISON, GTJ ;

ASHTON, P ;

AZUELOS, G ;

BAINES, JTM ;

BALL, AH ;

BANKS, J ;

BARKER, GJ ;

BARLOW, RJ ;

BATLEY, JR ;

BECKER, J ;

BEHNKE, T ;

BELL, KW ;

BELLA, G ;

BETHKE, S ;

BIEBEL, O ;

BINDER, U ;

BLOODWORTH, IJ ;

BOCK, P ;

BREUKER, H ;

BROWN, RM ;

BRUN, R ;

BUIJS, A ;

BURCKHART, HJ ;

CAPILUPPI, P ;

CARNEGIE, RK ;

CARTER, AA ;

CARTER, JR ;

CHANG, CY ;

CHARLTON, DG ;

CHRIN, JTM ;

COHEN, I ;

COLLINS, WJ ;

CONBOY, JE ;

COUCH, M ;

COUPLAND, M ;

CUFFIANI, M ;

DADO, S ;

DALLAVALLE, GM ;

DENINNO, MM ;

DIECKMANN, A ;

DITTMAR, M ;

DIXIT, MS ;

DUCHOVNI, E ;

DUERDOTH, IP .

PHYSICS LETTERS B, 1990, 240 (3-4) :497-512

[6] A REALISTIC APPROACH TO THE STANDARD Z-PEAK [J].

BARDIN, DY ;

BILENKY, MS ;

MITSELMAKHER, GV ;

RIEMANN, T ;

SACHWITZ, M .

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1989, 44 (03) :493-502

[7]

BERENDS FA, DESY87094 PREPR

[8]

BERENDS FA, 1989, CERN8908, V1, P89

[9]

BILENKY MS, 1989, UNPUB PHYS LETT B

[10]

COMPAGNE JE, 1989, Z PHYS C, V43, P469

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