A Precision measurement of the number of neutrino species - INSPIRE

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A Precision measurement of the number of neutrino species

L3

Collaboration

Jul, 1990

12 pages

Published in:

Phys.Lett.B 249 (1990) 341-352

Published: 1990

DOI:

10.1016/0370-2693(90)91267-F

Report number:

L3-009

Experiments:

CERN-LEP-L3

View in:

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Abstract: (Elsevier)

We have measured the cross section for e + e − →hadrons over the center of mass energy range of the Z 0 peak, from 88.22 to 95.03 GeV. We determine the Z 0 mass M z =91.164±0.013 (experiment) ±0.030 (LEP) GeV. Within the framework of the standard model we determine the invisible width, Γ invisible =0.502±0.018 GeV, and the number of light neutrino species, N ν =3.01±0.11. We exclude the existence of a supersymmetric scalar neutrino having a mass less than 31.4 GeV, at the 95% confidence level. We performed a model independent combined fit to the e + e − →hadrons and e + e − → μ + μ − data to determine total width, leptonic width and hadronic width of the Z 0 .

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: mass
mass: Z0
Z0: width
cross section: hadronic

References(28)

Figures(0)

Partial Symmetries of Weak Interactions

S.L. Glashow
(
- Copenhagen U.
)

- Nucl.Phys. 22 (1961) 579-588,
- Also in *Lai, C. H. (Ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 171-180
•
DOI:
- 10.1016/0029-5582(61)90469-2

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

Measurement of $\Z^0$ Decays to Hadrons and a Precise Determination of the Number of Neutrino Species

L3

Collaboration

•

B. Adeva
(
- CERN
)

et al.

- Phys.Lett.B 237 (1990) 136-146
•
DOI:
- 10.1016/0370-2693(90)90476-M

A Precise Determination of the Number of Families With Light Neutrinos and of the $Z$ Boson Partial Widths

ALEPH

Collaboration

•

D. Decamp
(
- Annecy, LAPP
)

et al.

- Phys.Lett.B 235 (1990) 399-411
•
DOI:
- 10.1016/0370-2693(90)91984-J

A Precise Measurement of the $Z$ Resonance Parameters Through Its Hadronic Decays

DELPHI

Collaboration

•

P. Abreu
(
- LIP, Lisbon
)

et al.

- Phys.Lett.B 241 (1990) 435-448,
- Phys. Lett. B241 (1990) 435-448 and CERN Geneva - CERN-EP 90-032 (90,rec.May) 18 p
•
DOI:
- 10.1016/0370-2693(90)91668-2

Measurements of $Z$ Boson Resonance Parameters in $e^{+} e^{-}$ Annihilation

et al.

- Phys.Rev.Lett. 63 (1989) 2173
•
DOI:
- 10.1103/PhysRevLett.63.2173

A Combined Analysis of the Hadronic and Leptonic Decays of the $\Z^0$

OPAL

Collaboration

•

M.Z. Akrawy
(
- Queen Mary, U. of London
)

et al.

- Phys.Lett.B 240 (1990) 497-512
•
DOI:
- 10.1016/0370-2693(90)91137-Z

The Construction of the L3 Experiment

L3

Collaboration

•

B. Adeva
(
- CERN
)

et al.

- Nucl.Instrum.Meth.A 289 (1990) 35-102
•
DOI:
- 10.1016/0168-9002(90)90250-A

Radiative Corrections to Bhabha Scattering at High-Energies. 1. Virtual and Soft Photon Corrections

- Nucl.Phys.B 304 (1988) 687-711
•
DOI:
- 10.1016/0550-3213(88)90650-5

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

Distributions for electron-Positron Annihilation Into Two and Three Photons

Frits A. Berends
(
- Leiden U. and
- DESY
)
,
R. Kleiss
(
- Leiden U. and
- DESY
)

- Nucl.Phys.B 186 (1981) 22-34
•
DOI:
- 10.1016/0550-3213(81)90090-0

Multi - Photon Monte Carlo for Bhabha Scattering at Low Angles

Stanislaw Jadach
(
- Jagiellonian U. and
- CERN and
- SLAC
)
,
B.F.L. Ward
(
- Tennessee U. and
- SLAC
)

- Phys.Rev.D 40 (1989) 3582-3589
•
DOI:
- 10.1103/PhysRevD.40.3582

The infrared divergence phenomena and high-energy processes

D.R. Yennie
(
- Minnesota U.
)
,
Steven C. Frautschi
(
- UC, Berkeley
)
,
H. Suura
(
- Nihon U., Tokyo
)

- Annals Phys. 13 (1961) 379-452
•
DOI:
- 10.1016/0003-4916(61)90151-8

The Lund Monte Carlo for Jet Fragmentation and e+ e- Physics. Jetset Version 6.3: An Update

- Comput.Phys.Commun. 43 (1987) 367
•
DOI:
- 10.1016/0010-4655(87)90054-3

Measurement of $\Z^0 \to b \bar{b}$ Decay Properties

L3

Collaboration

•

B. Adeva
(
- CERN
)

et al.

- Phys.Lett.B 241 (1990) 416-424
•
DOI:
- 10.1016/0370-2693(90)91666-Y

Analytic Forms for the $e^+ e^-$ Annihilation Cross-section Near the $Z$ Including Initial State Radiation

Robert N. Cahn
(
- LBL, Berkeley
)

- Phys.Rev.D 36 (1987) 2666,
- Phys.Rev.D 40 (1989) 922 (erratum)
•
DOI:
- 10.1103/PhysRevD.36.2666

Model Independent Analysis of the $Z$ Line Shape in $e^+ e^-$ Annihilation

A. Borrelli
(
- INFN, Rome
)
,
M. Consoli
(
- CERN
)
,
L. Maiani
(
- Rome U. and
- INFN, Rome
)
,
R. Sisto
(
- Rome U.
)

- Nucl.Phys.B 333 (1990) 357-379
•
DOI:
- 10.1016/0550-3213(90)90042-C

A Precise Determination of the $W$ and $Z$ Masses at the {CERN} $\bar{p} p$ Collider

UA2

Collaboration

•

J. Alitti
(
- IRFU, Saclay
)

et al.

- Phys.Lett.B 241 (1990) 150-164
•
DOI:
- 10.1016/0370-2693(90)91502-3

A Precision Measurement of sin**2theta(W) from Semileptonic Neutrino Scattering

et al.

- Phys.Rev.Lett. 57 (1986) 298,
- Warsaw Sympos.1986:119
•
DOI:
- 10.1103/PhysRevLett.57.298

A precise determination of the electroweak mixing angle from semi-leptonic neutrino scattering

CHARM

Collaboration

•

J.V. Allaby
(
- CERN
)

et al.

- Phys.Lett.B 177 (1986) 446,
•
DOI:
- 10.1016/0370-2693(86)90787-2

A Precise Determination of the Electroweak Mixing Angle from Semileptonic Neutrino Scattering

CHARM

Collaboration

•

J.V. Allaby
(
- CERN
)

et al.

- Z.Phys.C 36 (1987) 611
•
DOI:
- 10.1007/BF01630598

The Implications of Recent Electroweak Data for m( $t$ ) and M( $H$ )

John R. Ellis
(
- CERN
)
,
Gian Luigi Fogli
(
- Bari U. and
- INFN, Bari
)

- Phys.Lett.B 232 (1989) 139-144
•
DOI:
- 10.1016/0370-2693(89)90571-6

Extension of the Algebra of Poincare Group Generators and Violation of p Invariance

Yu.A. Golfand
(
- Lebedev Inst.
)
,
E.P. Likhtman
(
- Lebedev Inst.
)

- JETP Lett. 13 (1971) 323-326,
- Pisma Zh.Eksp.Teor.Fiz. 13 (1971) 452-455,
•
DOI:
- 10.1142/9789814542340_0001

Is the Neutrino a Goldstone Particle?

D.V. Volkov
(
- Kharkov, KIPT
)
,
V.P. Akulov
(
- Kharkov, KIPT
)

- Phys.Lett.B 46 (1973) 109-110,
- also in *FERRARA, S. (ED.): SUPERSYMMETRY, VOL. 1*, 11-12
•
DOI:
- 10.1016/0370-2693(73)90490-5

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