Energy scan for narrow states in e+e− annihilation at C.M. energies between 29.90 and 31.46 GeV

doi:10.1016/0370-2693(79)90145-X

Physics Letters B

Volume 88, Issues 1–2, 3 December 1979, Pages 199-202

https://doi.org/10.1016/0370-2693(79)90145-X Get rights and content

Abstract

A fine energy scan has been performed to search for narrow states in e⁺e⁻ annihilation at c.m. energies between 29.90 and 31.46 GeV. No such state has been observed. The 90% confidence upper limit on the leptonic decay width times the hadronic decay branching ratio is Γ_eeB_h<1.6 keV.

References (5)

Ch. Berger
DESY Report 79/56
(1979)
D.P. Barber
MIT Report
(1979)
W. Bartel
DESY Report 79/64
(1979)
R. Brandelik
DESY Reports 79/73
(1979)
R. Brandelik
DESY Reports 79/74
(1979)

There are more references available in the full text version of this article.

Cited by (18)

e+e- physics at petra-the first five years
1984, Physics Reports
Measurement of R and search for the top quark in e+e- annihilation between 39.8 and 45.2 GeV
1984, Physics Letters B
e⁺e⁻ annihilation into hadrons was studied at CM energies between 39.8 and 45.2 GeV and a search was made for new heavy quarks. No evidence was found for the existence of a narrow state excluding the possible existence of the lowest vector toponium state in this mass range. A search for continuum production of heavy quarks led to lower mass limits for new quarks of 22.0 GeV ( $e_{Q} = 23$ ) and 21.0 GeV ( $e_{Q} = 13$ ). Quarks are found to be pointlike, the corresponding mass parameter being larger than 288 GeV. A fit of the QCD and the electroweak contributions to R=σ_tot/σ_μμ yielded sin²θW = 0.30_−0.07^+0.23.
Quark mixing in weak interactions
1983, Physics Reports
The status of the quark mixing in weak interaction is reviewed. The 3×3 quark mixing matrix for the three left-handed doublet model is analyzed using various experimental information involving strange, charmed, and b-flavored particles. Its interplay with nonleptonic decays, implication on neutral particle-antiparticle mixing and CP violation in heavy quark systems, and the possible origin of the quark mixing from quark mass matrix are discussed. Finally we briefly review the status of alternative sources for CP violation, and alternative models to the three left-hand quark doublet model.
A measurement of σ<inf>tot</inf>(e+e- → hadrons) for cm energies between 12.0 and 36.7 GeV
1982, Physics Letters B
The ration R = σ(e⁺e⁻ → hadrons)σ_μμ was measured between 12.0 and 36.7 GeV c.m. energy W with a precision of typically ± 5.2%. R is found to be constant with an average R = 4.01 ± 0.03 (stat) ± (syst.) for W ⩾ 14 GeV. Quarks are found to be point-like, the mass parameter describing a possible quark form-factor being larger than 186 GeV. Fits including QCD corrections and a weak neutral-current contribution are presented.
e+e- physics with the PLUTO detector
1982, Physics Reports
The contributions of the PLUTO experiment to e⁺e⁻ physics at collision energies in the range of 3–32 GeV are reviewed. The review briefly sketches the storage rings DORIS and PETRA at DESY, and describes the most important features of the PLUTO detector, of data processing, and of the analysis methods. It covers the physics results in the fields of electroweak interactions, of the heavy lepton τ and the search for still heavier leptons, of hadron production with evidence for quark and gluon jets, as well as for single and multiple gluon emission, of Y decays and their relation to QCD, and presents results in high-energy photon-photon interactions, including the first measurement of the photon structure function.
Measurement of hadron production and three-jet event properties at petra
1982, Physics Letters B
We have performed a high statistics measurement of the production rate and the energy flow pattern of hadron events between √s=33 and 36.7 GeV. The data show no evidence for the production of a new quark with charge $23 e$ . Planar events in e⁺e⁻→hadrons are shown to have three well separated jets. The production rate and the shape of three-jet events are compared with many models and we find that only the QCD model can explain the data.

View all citing articles on Scopus

⁸: Supported by the Deutsches Bundesministerium für Forschung und Technologie.

¹: Now at SLAC, Stanford, CA, USA.

View full text

Article preview

Physics Letters B

Abstract

References (5)

DESY Report 79/56

MIT Report

DESY Report 79/64

DESY Reports 79/73

DESY Reports 79/74

Cited by (18)

e<sup>+</sup>e<sup>-</sup> physics at petra-the first five years

Measurement of R and search for the top quark in e<sup>+</sup>e<sup>-</sup> annihilation between 39.8 and 45.2 GeV

Quark mixing in weak interactions

A measurement of σ<inf>tot</inf>(e<sup>+</sup>e<sup>-</sup> → hadrons) for cm energies between 12.0 and 36.7 GeV

e<sup>+</sup>e<sup>-</sup> physics with the PLUTO detector

Measurement of hadron production and three-jet event properties at petra