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Article
Results from DASP one + e − annihilation between 3.1 and 5.2 GeV
This paper summarizes the measurements one + e − annihilation performed by the DASP Collaboration in the energy range between 3.1 and 5.2 GeV. The following topics are covered: total cross section, production and...
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Chapter and Conference Paper
Two photon results from TASSO
Two photon annihilation processes were observed with the TASSO detector at the e+e- storage ring PETRA. We report on the analyses of untagged and single tag events.
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Article
e + e− annihilation at high energies and search for thet-quark continuum contribution
Measurements ofR, sphericity and thrust are presented for c.m. energies between 12 and 31.6 GeV. A possible contribution of at $$\bar...
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Article
Laser-microwave spectroscopy of lithium ions: 23 S 1 hyperfine structure of7Li+
The hyperfine structure (hfs) splittings of the metastable 1s2s 3 S 1 state of7Li+ have been measured with combined laser optical pum** and microwave resonance. A lowenergy Li+ ion beam, optically excited by an...
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Article
Two-photon excitation of the tensor mesonf 0(1270)
We have measured charged particle pair production in two-photon scattering at thee + e − storage ring PETRA. While the main source of such events is the production of lepton pairs, the presence of an additional p...
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Article
Angular correlations inγγ→ρ 0ρ0 near threshold
We present an analysis ofρ 0 ρ 0 production by two photons in theρ 0 ρ 0 invariant mass range from 1.2 to 2.0 GeV. From a study of the angular correlations in the process γγ→ρ 0 ρ 0→π−π+π− we exclude a dominant c...
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Article
Charged hadron composition of the final state ine + e − annihilation at high energies
The inclusive production of π± andK ± mesons and of protons and antiprotons ine + e − annihilation has been measured at c.m. energies ofW=14, 22 and 34GeV. Using time of flight measurements and Cerenkov counters ...
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Article
An improved measurement of electroweak couplings frome + e −→e + e − ande + e −→μ + μ −
We present an analysis of electroweak leptonic couplings from high statistics experiments on Bhabha scattering and μ pair production at an energy of 34.5 GeV. The forward-backward charge asymmetry of the μ pai...
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Article
Photon pair production bye + e − annihilation and search for supersymmetric photinos at energies greater than 40 GeV
The cross section for the processe + e −→γγ has been measured for c.m. energies 39.5<W<46.8 GeV. Good agreement with the predictions of QED was found and lower limits for the cut-off parameters of Λ+>61 GeV and Λ
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Article
Production and muonic decay of heavy quarks ine + e − annihilation at 34.5 GeV
The production of prompt muons ine + e − annihilation has been studied at centre of mass energies near 34.5 GeV. The measured semi-muonic branching ratios ofb andc quarks areB(b»Xμv) =0.117±0.028±0.01 andB(c→Xμv)...
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Article
Determination of α s in first and second order QCD frome + e − annihilation into hadrons
Multihadron events produced bye + e − annihilation at a c.m. energy of 34.6 GeV have been used to determine α s . The predictions ...
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Article
Upper limits on the production rate of the decuplet baryons Δ andΣ* ine + e − annihilation at 34.4 GeV
Samples of ∼1,900 identified protons and ∼500 Λ have been used to search for decuplet baryon production ine + e − annihilation at a c.m. energy of 34.4 GeV. Thep π+
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Article
Jet production and fragmentation ine + e − annihilation at 12–43 GeV
We present the general properties of jets produced bye + e − annihilation. Their production and fragmentation characteristics have been studied with charged particles for c.m. energies between 12 and 43 GeV. In t...
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Article
A study of 3-jet events ine + e − annihilation into hadrons at 34.6 GeV c.m. energy
Three-jet events produced bye + e − annihilation into hadrons at 34.6 GeV c.m. energy were studied by comparing them with 2nd order QCD and two different models of fragmentation. The distribution of low energy pa...
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Article
A detailed study of strange particle production ine + e − annihilation at high energy
Results onK 0 and Λ production ine + e − annihilation at c.m. energies of 14, 22 and 34 GeV are presented. The shape of theK 0 and Λ differential cross sections are very similar to each other and to those of π±,K
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Article
Measurement of the lifetime of charged and neutralD mesons with high resolution silicon strip detectors
We have measured the lifetime of charged and neutralD mesons using high resolution silicon strip detectors in the NA11 spectrometer at the CERN SPS. TheD mesons were produced in 200 GeV π− interactions. We obtain...
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Article
Particle correlation observed ine + e − annihilations into hadrons at c.m. Energies between 29 and 37 GeV
We have studied the correlations between charged particles produced ine + e − annihilations into hadrons at c.m. energies between 29 and 37 GeV. We have analysed the correlations between the charged multiplicitie...
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Article
The production and decay of Tau leptons ine + e − annihilation at PETRA energies
We have observed τ pair production at average CM energies of 13.9, 22.3, 34.5 and 43.1 GeV. The cross-sections are consistent with QED, the cut off parameters beingΛ +>161 GeV andΛ −169 GeV (95% CL). The topologi...
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Article
Measurement ofD meson production in 200 GeV π−-Be interactions
We have measured the differential and total cross sections ofD meson production in 200 GeV π−-beryllium interactions, using a sample of 48 fully reconstructed and nearly background-freeD mesons in the decay chann...
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Article
Joint production of ϕ mesons andπ ±,π 0,p, \(\bar p\) ,K s 0 andK ± in hadronic interactions
The joint production of ϕ mesons andπ ±,π 0,p, \(\bar p\) ,K s ...
