Measurement of the $Z^0$ Mass and Width with the OPAL Detector at LEP

We report an experimental determination of the cross section for e + e − → hadrons from a scan around the Z 0 pole. On the basis of 4350 hadronic events collected over seven energy points between 89.26 GeV and 93.26 GeV we obtain a mass of m z =91.01±0.05±0.05 GeV, and a total decay width of Γ z =2.60±0.13 GeV. In the context of the standard model t these results imply 3.1 ± 0.4 neutrino generations.

talk
electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
luminosity: measurement
Z0: electroproduction
electroproduction: Z0
Z0: nonleptonic decay
nonleptonic decay: Z0

References(18)

Figures(0)

A Model of Leptons

Steven Weinberg
(
- MIT, LNS
)

- Phys.Rev.Lett. 19 (1967) 1264-1266,
- Also in *Lichtenberg, D. B. (ed.), Rosen, S. P. (ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 157-159,
- In *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 185-187,
- In *Rosner, J. L. (ed.): New Particles*, 26-28
•
DOI:
- 10.1103/PhysRevLett.19.1264

Weak and Electromagnetic Interactions

Abdus Salam
(
- Imperial Coll., London and
- ICTP, Trieste
)

- Conf.Proc.C 680519 (1968) 367-377,
- Reprinted in *Lichtenberg, D. B. (ed.), Rosen, S. P. (ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 160-170, and in *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 188-198,
- Also in *Rosner, J.L. (ed.): New particles* 29-39,
- Also in *Ali, A. (ed.) et al.: Selected papers of Abdus Salam* 244-254
•
DOI:
- 10.1142/9789812795915_0034

Weak Interactions with Lepton-Hadron Symmetry

- Phys.Rev.D 2 (1970) 1285-1292,
- Also in *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 203-210,
- In *Rosner, J.L. (ed.): New Particles*, 18-25,
- In *Lichtenberg, D. B. (Ed.), Rosen, S. P. (Ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 193-200.,
- In *Bologna 1984, Proceedings, Fifty Years of Weak-Interaction Physics* 687-694
•
DOI:
- 10.1103/PhysRevD.2.1285

Experimental Observation of Lepton Pairs of Invariant Mass Around 95-GeV/c**2 at the CERN SPS Collider

UA1

Collaboration

•

G. Arnison
(
- Rutherford
)

et al.

- Phys.Lett.B 126 (1983) 398-410,
- In *Ithaca 1983, Proceedings, Lepton and Photon Interactions At High Energies*, 27-52,
- IN *BOLOGNA 1984, PROCEEDINGS, FIFTY YEARS OF WEAK-INTERACTION PHYSICS* 779-791. PHYS. LETT. B126 (1983) 398-410) AND CERN GENEVA - CERN-EP 83-073 (83,REC.JUN.) 32 P. (SEE CONFERENCE INDEX),
•
DOI:
- 10.1016/0370-2693(83)90188-0

Evidence for $Z^{0} \to e^+ e^-$ at the CERN $\bar{p} p$ Collider

UA2

Collaboration

•

P. Bagnaia
(
- CERN
)

et al.

- Phys.Lett.B 129 (1983) 130-140,
•
DOI:
- 10.1016/0370-2693(83)90744-X

Monte Carlo Simulation of General Hard Processes with Coherent QCD Radiation

G. Marchesini
(
- Parma U. and
- INFN, Parma
)
,
B.R. Webber
(
- Cambridge U.
)

- Nucl.Phys.B 310 (1988) 461-526
•
DOI:
- 10.1016/0550-3213(88)90089-2

Radiative Corrections to Bhabha Scattering at High-Energies. 2. Hard Photon Corrections and Monte Carlo Treatment

- Nucl.Phys.B 304 (1988) 712-748
•
DOI:
- 10.1016/0550-3213(88)90651-7

Higher Order Radiative Corrections at LEP Energies

- Nucl.Phys.B 297 (1988) 429,
- Nucl.Phys.B 304 (1988) 921 (erratum)
•
DOI:
- 10.1016/0550-3213(88)90313-6

Radiative Corrections to e+ e- ---> mu+ mu- Around the Z0

- Nucl.Phys.B 171 (1980) 118,
- Nucl.Phys.B 197 (1982) 543 (erratum)
•
DOI:
- 10.1016/0550-3213(82)90458-8

Measurement of the Mass and Width of the $Z^0$ Boson at the Fermilab Tevatron

CDF

Collaboration

•

F. Abe

et al.

- Phys.Rev.Lett. 63 (1989) 720
•
DOI:
- 10.1103/PhysRevLett.63.720

Initial Measurements of Z Boson Resonance Parameters in e+ e- Annihilation

et al.

- Phys.Rev.Lett. 63 (1989) 724
•
DOI:
- 10.1103/PhysRevLett.63.724

Studies of Intermediate Vector Boson Production and Decay in UA1 at the CERN Proton - Antiproton Collider

UA1

Collaboration

•

C. Albajar

et al.

- Z.Phys.C 44 (1989) 15-61
•
DOI:
- 10.1007/BF01548582

Measurement of the Standard Model Parameters from a Study of W and Z Bosons

UA2

Collaboration

•

R. Ansari
(
- Orsay, LAL
)

et al.

- Phys.Lett.B 186 (1987) 440-451
•
DOI:
- 10.1016/0370-2693(87)90324-8

Events with Large Missing Transverse Energy at the CERN Collider: Search for Decays of W+- Into Heavy Leptons and of Z0 Into Noninteracting Particles. 2.

UA1

Collaboration

•

C. Albajar
(
- CERN
)

et al.

- Phys.Lett.B 185 (1987) 241-248,
- Phys.Lett.B 191 (1987) 463 (addendum),
- Phys.Lett.B 197 (1987) 565 (erratum)
•
DOI:
- 10.1016/0370-2693(87)91562-0