Measurement of Z0 decays to hadrons, and a precise determination of the number of neutrino species

L3 Collaboration; X. Leytens

doi:10.1016/0370-2693(90)90476-M

Measurement of Z⁰ decays to hadrons, and a precise determination of the number of neutrino species

L3 Collaboration
, X. Leytens

Research output: Contribution to journal › Article › Academic › peer-review

71 Citations (Scopus)

27 Downloads (Pure)

Abstract

We have made a precise measurement of the cross section for e⁺e^-→Z⁰→hadrons with the L3 detector at LEP, covering the s range from 88.28 to 95.04 GeV. From a fit to the Z⁰ mass, total width, and the hadronic cross section to be M_Z ⁰=91.160 ± 0.024 (experiment) ±0.030(LEP) GeV, Γ_Z ⁰=2.539±0.054 GeV, and σ_h(M_Z ⁰)=29.5±0.7 nb. We also used the fit to the Z⁰ peak cross section and the width todetermine Γ_invisible=0.548±0.029 GeV, which corresponds to 3.29±0.17 species of light neutrinos. The possibility of four or more neutrino flavors is thus ruled out at the 4σ confidence level.

Original language	English
Pages (from-to)	136-146
Number of pages	11
Journal	Physics Letters B
Volume	237
Issue number	1
DOIs	https://doi.org/10.1016/0370-2693(90)90476-M
Publication status	Published - 8 Mar 1990
Externally published	Yes

Funding

We wish to thank CERN for its hospitality and help. We want particularly to expresso ur gratitude to the LEP division: it is their excellenta chievementsw hich made this experiment possible. We acknowledget he support of all the funding agenciesw hich contributed to this experiment.

Access to Document

10.1016/0370-2693(90)90476-M

publisher versionFinal published version, 938 KB

Cite this

@article{cda9497e32f24171a374e148d4b75cb4,

title = "Measurement of Z0 decays to hadrons, and a precise determination of the number of neutrino species",

abstract = "We have made a precise measurement of the cross section for e+e-→Z0→hadrons with the L3 detector at LEP, covering the s range from 88.28 to 95.04 GeV. From a fit to the Z0 mass, total width, and the hadronic cross section to be MZ 0=91.160 ± 0.024 (experiment) ±0.030(LEP) GeV, ΓZ 0=2.539±0.054 GeV, and σh(MZ 0)=29.5±0.7 nb. We also used the fit to the Z0 peak cross section and the width todetermine Γinvisible=0.548±0.029 GeV, which corresponds to 3.29±0.17 species of light neutrinos. The possibility of four or more neutrino flavors is thus ruled out at the 4σ confidence level.",

author = "\{L3 Collaboration\} and B. Adeva and O. Adriani and M. Aguilar-Benitez and H. Akbari and J. Alcaraz and A. Aloisio and G. Alverson and Alviggi, \{M. G.\} and Q. An and H. Anderhub and Anderson, \{A. L.\} and Andreev, \{V. P.\} and T. Angelov and L. Antonov and D. Antreasyan and A. Arefiev and T. Azemoon and T. Aziz and Baba, \{P. V.K.S.\} and P. Bagnaia and Bakken, \{J. A.\} and L. Baksay and Ball, \{R. C.\} and S. Banerjee and J. Bao and L. Barone and A. Bay and U. Becker and S. Beingessner and Bencze, \{Gy L.\} and J. Berdugo and P. Berges and B. Bertucci and Betev, \{B. L.\} and A. Biland and R. Bizzarri and Blaising, \{J. J.\} and P. Bl{\"o}meke and B. Blumenfeld and Bobbink, \{G. J.\} and M. Bocciolini and W. B{\"o}hlen and A. B{\"o}hm and T. B{\"o}hringer and B. Borgia and D. Bourilkov and M. Bourquin and D. Boutigny and Branson, \{J. G.\} and X. Leytens",

year = "1990",

month = mar,

day = "8",

doi = "10.1016/0370-2693(90)90476-M",

language = "English",

volume = "237",

pages = "136--146",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "1",

}

TY - JOUR

T1 - Measurement of Z0 decays to hadrons, and a precise determination of the number of neutrino species

AU - L3 Collaboration

AU - Adeva, B.

AU - Adriani, O.

AU - Aguilar-Benitez, M.

AU - Akbari, H.

AU - Alcaraz, J.

AU - Aloisio, A.

AU - Alverson, G.

AU - Alviggi, M. G.

AU - An, Q.

AU - Anderhub, H.

AU - Anderson, A. L.

AU - Andreev, V. P.

AU - Angelov, T.

AU - Antonov, L.

AU - Antreasyan, D.

AU - Arefiev, A.

AU - Azemoon, T.

AU - Aziz, T.

AU - Baba, P. V.K.S.

AU - Bagnaia, P.

AU - Bakken, J. A.

AU - Baksay, L.

AU - Ball, R. C.

AU - Banerjee, S.

AU - Bao, J.

AU - Barone, L.

AU - Bay, A.

AU - Becker, U.

AU - Beingessner, S.

AU - Bencze, Gy L.

AU - Berdugo, J.

AU - Berges, P.

AU - Bertucci, B.

AU - Betev, B. L.

AU - Biland, A.

AU - Bizzarri, R.

AU - Blaising, J. J.

AU - Blömeke, P.

AU - Blumenfeld, B.

AU - Bobbink, G. J.

AU - Bocciolini, M.

AU - Böhlen, W.

AU - Böhm, A.

AU - Böhringer, T.

AU - Borgia, B.

AU - Bourilkov, D.

AU - Bourquin, M.

AU - Boutigny, D.

AU - Branson, J. G.

AU - Leytens, X.

PY - 1990/3/8

Y1 - 1990/3/8

N2 - We have made a precise measurement of the cross section for e+e-→Z0→hadrons with the L3 detector at LEP, covering the s range from 88.28 to 95.04 GeV. From a fit to the Z0 mass, total width, and the hadronic cross section to be MZ 0=91.160 ± 0.024 (experiment) ±0.030(LEP) GeV, ΓZ 0=2.539±0.054 GeV, and σh(MZ 0)=29.5±0.7 nb. We also used the fit to the Z0 peak cross section and the width todetermine Γinvisible=0.548±0.029 GeV, which corresponds to 3.29±0.17 species of light neutrinos. The possibility of four or more neutrino flavors is thus ruled out at the 4σ confidence level.

AB - We have made a precise measurement of the cross section for e+e-→Z0→hadrons with the L3 detector at LEP, covering the s range from 88.28 to 95.04 GeV. From a fit to the Z0 mass, total width, and the hadronic cross section to be MZ 0=91.160 ± 0.024 (experiment) ±0.030(LEP) GeV, ΓZ 0=2.539±0.054 GeV, and σh(MZ 0)=29.5±0.7 nb. We also used the fit to the Z0 peak cross section and the width todetermine Γinvisible=0.548±0.029 GeV, which corresponds to 3.29±0.17 species of light neutrinos. The possibility of four or more neutrino flavors is thus ruled out at the 4σ confidence level.

UR - https://www.scopus.com/pages/publications/0011610233

U2 - 10.1016/0370-2693(90)90476-M

DO - 10.1016/0370-2693(90)90476-M

M3 - Article

AN - SCOPUS:0011610233

SN - 0370-2693

VL - 237

SP - 136

EP - 146

JO - Physics Letters B

JF - Physics Letters B

IS - 1

ER -

Measurement of Z⁰ decays to hadrons, and a precise determination of the number of neutrino species

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this