DETERMINATION OF Z0 RESONANCE PARAMETERS AND COUPLINGS FROM ITS HADRONIC AND LEPTONIC DECAYS

被引:70
作者
ABREU, P
ADAM, W
ADAMI, F
ADYE, T
AKESSON, T
ALEKSEEV, GD
ALLEN, P
ALMEHED, S
ALTED, F
ALVSVAAG, SJ
AMALDI, U
ANASSONTZIS, E
ANTILOGUS, P
APEL, WD
APSIMON, RJ
ASMAN, B
ASTIER, P
AUGUSTIN, JE
AUGUSTINUS, A
BAILLON, P
BAMBADE, P
BARAO, F
BARBIELLINI, G
BARDIN, DY
BARONCELLI, A
BARRING, O
BARTL, W
BATTAGLIA, M
BATES, MJ
BAUBILLIER, M
BECKS, KH
BEESTON, CJ
BEGALLI, M
BEILLIERE, P
BELOKOPYTOV, Y
BELTRAN, P
BENEDIC, D
BENLLOCH, JM
BERGGREN, M
BERTRAND, D
BIAGI, S
BIANCHI, F
BIBBY, JH
BILENKY, MS
BILLOIR, P
BJARNE, J
BLOCH, D
BLYTH, S
BOGOLUBOV, PN
BOLOGNESE, T
机构
[1] AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA
[2] CENS,F-91191 GIF SUR YVETTE,FRANCE
[3] RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND
[4] IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011
[5] UNIV LUND,DEPT PHYS,S-22363 LUND,SWEDEN
[6] JOINT INST NUCL RES,MOSCOW 101000,USSR
[7] UNIV VALENCIA,SCIC,CTR MIXTO,INST FIS CORPUSCULAR,E-46100 BURJASSOT,SPAIN
[8] UNIV WARSAW,PL-00681 WARSAW,POLAND
[9] UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY
[10] CERN,CH-1211 GENEVA 23,SWITZERLAND
[11] UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE
[12] UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE
[13] FAC SCI OUJDA,DEPT PHYS,OUJDA,MOROCCO
[14] UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY
[15] UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN
[16] UNIV PARIS 06,LPNHE,F-75230 PARIS 05,FRANCE
[17] UNIV PARIS 07,F-75230 PARIS 05,FRANCE
[18] UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE
[19] UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY
[20] IST NACL FIZ NUCL,I-34127 TRIESTE,ITALY
[21] UNIV UDINE,I-33100 UDINE,ITALY
[22] IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY
[23] UNIV MILAN,DIPARTMENTO FIS,I-20122 MILAN,ITALY
[24] IST NAZL FIS NUCL,I-20133 MILAN,ITALY
[25] UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND
[26] UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY
[27] UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY
[28] IST NAZL FIS NUCL,I-16146 GENOA,ITALY
[29] COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE
[30] INST HIGH ENERGY PHYS,SERPUKHOV 142284,USSR
[31] UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM
[32] UNIV ETAT MONS,FAC SCI,SERV PHYS PARTICULES ELEMENTAIRES,B-7000 MONS,BELGIUM
[33] UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND
[34] UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY
[35] IST NAZL FIS NUCL,I-10125 TURIN,ITALY
[36] NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS
[37] UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN
[38] UNIV PADUA,DIPARTMENTO FIS,I-35131 PADUA,ITALY
[39] IST NAZL FIS NUCL,I-35131 PADUA,ITALY
[40] UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI 17,FINLAND
[41] UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY
[42] UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN
[43] UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY
[44] IST NAZL FIS NUCL,I-00173 ROME,ITALY
[45] UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY
[46] IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY
[47] UNIV COMPLUTENSE MADRID,DEPT FIS ATOM MOLEC & NUCL,E-28040 MADRID,SPAIN
[48] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011
[49] NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK
[50] INST NUCL STUDIES,PL-00681 WARSAW,POLAND
关键词
D O I
10.1016/0550-3213(91)90007-K
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
From measurements of the cross sections for e+ e - --> hadrons and the cross sections and forward-backward charge-asymmetries for e+ e- --> e+ e-, mu+ mu- and tau+ tau- at several centre-of-mass energies around the Z0 pole with the DELPHI apparatus, using approximately 150000 hadronic and leptonic events from 1989 and 1990, one determines the following Z0 parameters: the mass and total width M(Z) = 91.177 +/- 0.022 GeV, GAMMA(Z) = 2.465 +/- 0.020 GeV, the hadronic and leptonic partial widths GAMMA(h) = 1.726 +/- 0.019 GeV, GAMMA(t) = 83.4 +/- 0.8 MeV, the invisible width GAMMA(inv) = 488 +/- 17 MeV, the ratio of hadronic over leptonic partial widths R(Z)z = 20.70 +/- 0.29 and the Born level hadronic peak cross section sigma-0 = 41.84 +/- 0.45 nb. A flavour-independent measurement of the leptonic cross section gives very consistent results to those presented above (GAMMA(t) = 83.7 +/- 0.8 MeV). From these results the number of light neutrino species is determined to be N(nu) = 2.94 +/0. 10. The individual leptonic widths obtained are: GAMMA(e) = 82.4 +/- 1.2 MeV, GAMMA(mu) = 86.9 +/- 2.1 MeV and GAMMA(tau) = 82.7 +/- 2.4 MeV. Assuming universality, the squared vector and axial-vector couplings of the Z0 to charged leptons are: VBAR(t)2 = 0.0003 +/- 0.0010 and ABAR(l)2 = 0.2508 +/- 0.0027. These values correspond to the electroweak parameters: rho(eff) = 1.003 +/- 0.011 and sin2-theta(W)eff = 0.241 +/- 0.009. Within the Minimal Standard Model (MSM), the results can be expressed in terms of a single parameter: sin2-theta(W)MSBAR = 0.2338 +/- 0.0027. All these values are in good agreement with the predictions of the MSM. Fits yield 43 < m(top) < 215 GeV at the 95% level. Finally, the measured values of GAMMA(Z) and GAMMA(inv), are used to derive lower mass bounds for possible new particles.
引用
收藏
页码:511 / 574
页数:64
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