A Direct determination of the number of light neutrino families from e+ e- ---> neutrino anti-neutrino gamma at LEP - INSPIRE

DataBETA

A Direct determination of the number of light neutrino families from e+ e- ---> neutrino anti-neutrino gamma at LEP

L3

Collaboration

Nov, 1991

13 pages

Published in:

Phys.Lett.B 275 (1992) 209-221,
Phys.Lett.B 277 (1992) 530-530 (erratum)

Published: 1992

DOI:

PDG:

{{\mathit Z}}

\rightarrow

Report number:

L3-035

Experiments:

CERN-LEP-L3

View in:

CERN Document Server

reference search55 citations

Citations per year

Abstract: (Elsevier)

The L3 detector at LEP has been used to determine the number of light neutrino families by measuring the cross section of single photon even in e + e − collisions at energies near the Z 0 resonance. We have observed 61 single photon candidates with more than 1.5 GeV of deposited energy in the barrel electromagnetic calorimeter, for a total integrated luminosity of 3.0 pb −1 . From a likelihood fir to the single photon cross sections, we determin N ν =3.24 ± 0.46 ( statistical ) ±0.22 ( systematic ).

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
neutrino: pair production
pair production: neutrino
neutrino: flavor
photon: associated production
associated production: photon
channel cross section: energy dependence

References(22)

Figures(0)

Measurement of electroweak parameters from hadronic and leptonic decays of the $Z^0$

L3

Collaboration

•

B. Adeva

et al.

- Z.Phys.C 51 (1991) 179-204,
- Z. Phys. C51 (1991) 179-203 and CERN Geneva - L3-028 (91/02,rec.Mar.) 80 p
•
DOI:
- 10.1007/BF01475788

Real and virtual photons in weak leptonic processes at high energies

- Nucl.Phys.B 41 (1972) 197-214
•
DOI:
- 10.1016/0550-3213(72)90430-0

How Many Neutrinos?

Ernest Ma
(
- Hawaii U.
)
,
Jon Okada
(
- Hawaii U.
)

- Phys.Rev.Lett. 41 (1978) 287,
- Phys.Rev.Lett. 41 (1978) 1759 (erratum)
•
DOI:
- 10.1103/PhysRevLett.41.287

Neutrino Counting in e+ e- Collisions

K.J.F. Gaemers
(
- NIKHEF, Amsterdam
)
,
R. Gastmans
(
- Leuven U.
)
,
F.M. Renard
(
- Montpellier U.
)

- Phys.Rev.D 19 (1979) 1605
•
DOI:
- 10.1103/PhysRevD.19.1605

Radiative Z0 Production: A Method for Neutrino Counting in e+ e- Collisions

- Phys.Lett.B 106 (1981) 414-418
•
DOI:
- 10.1016/0370-2693(81)90654-7

Search for Single Photons From Radiative Neutrino or Supersymmetric Particle Production

et al.

- Phys.Rev.D 33 (1986) 3472
•
DOI:
- 10.1103/PhysRevD.33.3472

Search for the Anomalous Production of Single Photons in $e^+ e^-$ Annihilation at $\sqrt{s}=29$ -{GeV}

C. Hearty
(
- Washington U., Seattle
)
,
J.E. Rothberg
(
- Washington U., Seattle
)
,
K.K. Young
(
- Washington U., Seattle
)
,
A.S. Johnson
(
- Boston U.
)
,
John Scott Whitaker
(
- Boston U.
)

et al.

- Phys.Rev.D 39 (1989) 3207
•
DOI:
- 10.1103/PhysRevD.39.3207

Neutrino Counting With the Cello Detector and Search for Supersymmetric Particles

CELLO

Collaboration

•

H.J. Behrend
(
- DESY
)

et al.

- Phys.Lett.B 215 (1988) 186-194
•
DOI:
- 10.1016/0370-2693(88)91094-5

A STUDY ON SINGLE PHOTON PRODUCTION AT s**(1/2) = 54-GeV TO 61.4-GeV

Venus

Collaboration

•

K. Abe
(
- Tohoku U.
)

et al.

- Phys.Lett.B 232 (1989) 431-436
•
DOI:
- 10.1016/0370-2693(89)90769-7

Signals From Nonstrongly Interacting Supersymmetric Particles at {LEP} Energies

M. Chen
(
- MIT, LNS
)
,
C. Dionisi
(
- Rome U. and
- INFN, Rome
)
,
M. Martinez
(
- Barcelona, Autonoma U.
)
,
X. Tata
(
- Wisconsin U., Madison
)

- Phys.Rept. 159 (1988) 201
•
DOI:
- 10.1016/0370-1573(88)90166-4

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

The L3 Energy Trigger

R. Bizzarri
(
- Rome U. and
- Calabria U.
)
,
F. Cesaroni
(
- Rome U. and
- Calabria U.
)
,
S. Gentile
(
- Rome U. and
- Calabria U.
)
,
G. Lunadei
(
- Rome U. and
- Calabria U.
)
,
M. Fukushima
(
- MIT, LNS
)

et al.

- Nucl.Instrum.Meth.A 283 (1989) 799-802
•
DOI:
- 10.1016/0168-9002(89)91461-7

Radiative Bhabha Scattering for Singly Tagged and Untagged Configurations

D. Karlen
(
- SLAC
)

- Nucl.Phys.B 289 (1987) 23-35
•
DOI:
- 10.1016/0550-3213(87)90369-5

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

Observation of a new eta pi0 pi0 resonance at 1900-MeV/c**2 in two photon scattering

et al.

- Phys.Lett.B 249 (1990) 353-358
•
DOI:
- 10.1016/0370-2693(90)91268-G

The Two photon particle production mechanism. Physical problems. Applications. Equivalent photon approximation

V.M. Budnev
(
- Sobolev IM, Novosibirsk
)
,
I.F. Ginzburg
(
- Sobolev IM, Novosibirsk
)
,
G.V. Meledin
(
- Sobolev IM, Novosibirsk
)
,
V.G. Serbo
(
- Sobolev IM, Novosibirsk
)

- Phys.Rept. 15 (1975) 181-281
•
DOI:
- 10.1016/0370-1573(75)90009-5

From Two to Three Jets in Heavy Boson Decays: An Algorithmic Approach

Ronald Kleiss
(
- CERN
)

- Phys.Lett.B 180 (1986) 400-405
•
DOI:
- 10.1016/0370-2693(86)91210-4

Higher Order Corrections to the Process $e^+ e^- \to$ Neutrino Anti-neutrino $\gamma$

R. Miquel
(
- Barcelona, Autonoma U.
)
,
C. Mana
(
- Madrid, CIEMAT
)
,
M. Martinez
(
- CERN
)

- Z.Phys.C 48 (1990) 309-314
•
DOI:
- 10.1007/BF01554481

Radiative Corrections to the Process $e^+ e^- \to$ Neutrino Anti-neutrino $\gamma$

Frits A. Berends
(
- Leiden U.
)
,
G.J.H. Burgers
(
- CERN
)
,
C. Mana
(
- CERN
)
,
M. Martinez
(
- Barcelona, Autonoma U.
)
,
W.L. van Neerven
(
- Leiden U.
)

- Nucl.Phys.B 301 (1988) 583-600
•
DOI:
- 10.1016/0550-3213(88)90278-7

Review of particle properties. Particle Data Group

J.J. Hernandez
(
- Valencia U. and
- CERN and
- Madrid, CIEMAT
)
,
L. Montanet
(
- Valencia U. and
- CERN and
- Madrid, CIEMAT
)
,
K. Gieselmann
(
- Valencia U. and
- CERN and
- Madrid, CIEMAT
)
,
M. Aguilar-Benitez
(
- Valencia U. and
- CERN and
- Madrid, CIEMAT
)
,
J. Stone
(
- Boston U.
)

et al.

- Phys.Lett.B 239 (1990) 1-515,
- Phys.Lett.B 253 (1991) 524-527 (erratum)
•
DOI:
- 10.1016/0370-2693(91)91762-K

Structure Function Approach to the Neutrino Counting Problem

O. Nicrosini
(
- Pavia U. and
- INFN, Pavia
)
,
L. Trentadue
(
- Parma U. and
- INFN, Milan
)

- Nucl.Phys.B 318 (1989) 1-21
•
DOI:
- 10.1016/0550-3213(89)90045-X

A Direct measurement of the Z0 invisible width by single photon counting

OPAL

Collaboration

•

M.Z. Akrawy

et al.

- Z.Phys.C 50 (1991) 373-384
•
DOI:
- 10.1007/BF01551449