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Article
Fluence Ordering of Solar Energetic Proton Events Using Cosmogenic Radionuclide Data
While data on the cosmogenic isotopes 14C and 10Be made it possible to evaluate extreme solar proton events (SPEs) in the past, their relation to standard parameters quantifying the SPE strengths, viz. the integr...
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Article
A Comparison of Ground Level Event e/p and Fe/O Ratios with Associated Solar Flare and CME Characteristics
Solar energetic particle (SEP) events reaching rigidities >1 GV are observed at 1 AU as ground-level events (GLEs). They are considered to be extreme cases of gradual SEP events, produced by shocks driven by w...
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Article
Gamma-Ray Line Observations of the 2000 July 14 Flare and SEP Impact on the Earth
The HXS and GRS detectors on Yohkoh observed the 14 July 2000, X5.7 flare, beginning at ∼ 10:20 UT, ∼ 4 min before the peak in soft X-rays. The hard X-rays and γ-rays peaked ∼ 3 min later at ∼ 10:27 UT. Solar γ-r...
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Article
Erratum to: WiZard: a program to measure cosmic-ray antiprotons and positrons, and search for primordial antimatter
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Article
WiZard: a program to measure cosmic-ray antiprotons and positrons, and search for primordial antimatter
In this paper the WiZard experiment to be performed at the U.S. Space Station Freedom is presented. The apparatus will operate at the Astromag facility as a magnetic spectrometer dedicated to the search of pri...
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Article
Measurement and analysis of the reactionγγ→π + π − π + π −
We have measured the cross section of four charged pion production in photon-photon interactions in the invariant mass range 1.0≦W γγ≦3.2 GeV and up toQ 2=16 GeV2. For 1.2 GeV≦W γγ≦1.7 GeV the process is dominate...
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Article
Tensor meson excitation in the reaction γγ→K S 0 K S 0
In the analysis of the reactione + e −→e + e − K S 0 K s ...
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Article
Jet Production in Photon-Photon Interactions
We present results on jet production in γγ interactions where both photons are quasi-real. The invariant masses of the hadronnic system are limited to the range 4≦W vis≦12 GeV/c2. The data approach the quark-Part...
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Article
Jet production at high transverse momenta by interactions of two quasi-real photons
An experimental study of two jet production by interactions of two quasi-real photons is presented. The data for production of jets with high transverse momentum squared, p T 2
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Article
A study of energy-energy correlations ine + e − annihilations at \(\sqrt s = 34.6\) GeV
We present high statistics measurements of the energy-energy correlation (EEC) and its related asymmetry (AEEC) ine + e − annihilation at a c.m. energy of 34.6 GeV. We find that the energy dependence as well as t...
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Article
Tests of the standard model with lepton pair production ine + e − reactions
The differential cross section of the reactione +e−→e +e− at a c.m. energy of 34.7 GeV has been measured. The result, together with our previously measurede +e−→α +α− data, are compared with the standard model pr...
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Article
Sterman-Weinberg jets and energy flow ine + e − annihilation at CM energies between 9.4 and 35 GeV
The Sterman-Weinberg 2-jet cross section is measured from the hadron energy flow using the thrust axis to define the axis of the jet cone. The results are compared with first order QCD predictions. Deviations ...
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Article
Tagged two photon production of muon Pairs
The processe + e −→e + e − μ+μ− has been studied using the PLUTO detector at PETRA. The data agree well with QED calculations to order α4. Comparison is also made with the predicted leptonic structure function of...
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Article
Study of the reactionγγ→2π +2π − π 0 γγ→ωω andγγ→ρ 0 ω
A search for the reactionsγγ→ωω andγγ→ρ 0 ω has been carried out at an averagee + e − CM energy of 34.6 GeV with an integrated luminosity of 45 pb−1. Upper limits are set for these two channels over the γγ CM Ene...
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Article
Measurements of Tau-Lepton production and decay
We have studied 419 τ pair events produced in the reactione + e −→τ+ τ− at a c.m. energy of 34.6 GeV. We measure the cross section and angular distribution, as well as the decay branching ratios. The production c...
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Article
TheQ 2 and transverse momentum dependence of jet production in photon-photon interactions
We present an experimental study of jetproduction in photon-photon interactions for 0.1≲Q 2≲120 GeV2 and jet transverse momentum,p T , up to 5 Ge...
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Article
Pion pair production in photon-photon interactions
The processγγπ+π− has been measured with complete particle identification. Cross-sections are presented from near threshold up to the region of thef(1270). In the mass range 0.5–0.7 GeV, crosssections are lower t...
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Article
A measurement of theQ 2 andW dependence of the γγ total cross section for hadron production
A measurement of the γγ total cross section, σγγ(Q 2 W), is presented for theQ 2 range 0.1 to 100 GeV2, and for the massW of the hadronic final state between 1.5 and 10 GeV. The dependence of σγγ on bothQ 2 andW ...
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Article
Measruement of transverse momenta ine + e − annihilation jets at PETRA
Transverse particle momenta have been measured ine + e − annihilation into hadrons at c.m. energies between 9.4 and 31.6 GeV. The data are fully corrected for detector effects and radiation in the initial state. ...
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Article
Energy moments for quark jets at PETRA
Measurements of energy moments for single quark jets at c.m. energies between 12 and 31.6 GeV are presented. The data, corrected for detector effects and initial state radiation, are compared to QCD prediction...
