Konigsmann, Kay
[1.0, 2.0]
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Measurement of the Sigma- charge radius by Sigma- electron elastic scattering.

The SELEX collaboration Gough Eschrich, Ivo M. ; Kruger, H. ; Simon, J. ; et al.
Phys.Lett.B 522 (2001) 233-239, 2001.
Inspire Record 558329 DOI 10.17182/hepdata.42898

The Sigma^- mean squared charge radius has been measured in the space-like Q^2 range 0.035-0.105 GeV^2/c^2 by elastic scattering of a Sigma^- beam off atomic electrons. The measurement was performed with the SELEX (E781) spectrometer using the Fermilab hyperon beam at a mean energy of 610 GeV/c. We obtain = (0.61 +/- 0.12 (stat.) +/- 0.09 (syst.)) fm^2. The proton and pi^- charge radii were measured as well and are consistent with results of other experiments. Our result agrees with the recently measured strong interaction radius of the Sigma^-.

1 data table
Table 1

Total systematic errors are given.


First observation of Sigma- e- elastic scattering in the hyperon beam experiment WA89 at CERN.

The WA89 collaboration Adamovich, M.I. ; Aleksandrov, Yu.A. ; Barberis, D. ; et al.
Eur.Phys.J.C 8 (1999) 59-66, 1999.
Inspire Record 500379 DOI 10.17182/hepdata.43061

We have investigated the elastic scattering of high energy $\Sigma^-$ off electrons from carbon and copper targets using the CERN hyperon beam. Scattering events a

1 data table
Table 1

No description provided.


rivet Analysis
Production of $\pi^0 \pi^0$ and $\pi^0 \eta$ in Photon - Photon Collisions

Edwards, C. ; Partridge, Richard ; Peck, C. ; et al.
Phys.Lett.B 110 (1982) 82-86, 1982.
Inspire Record 168793 DOI 10.17182/hepdata.30959

We investigate the four-photon final state produced in γγ colissions. In the π 0 π 0 channel we observe f(1270) production with predominantly helicity 2 and measure a partial width Γ γγ 2.9 +0.6 −0.4 ± keV (independent of assumptions on the helicity). We observe A 2 (1310) production in the π 0 η channel and find a partial width Γ γγ = 0.77 ± 0.18 ± 0.27 KeV (assuming helicity 2). We give an upper limit for f ≈ ηη .

3 data tables
Table 1

Data read from graph. Systematic error on M is of order of 2% or less.

Table 2

Data read from graph.

Table 3

No description provided.


Photoproduction of Neutral Pions in the Region of the Fourth Nucleon Resonance

Althoff, K.H. ; Gies, M. ; Kaul, O. ; et al.
Z.Phys.C 1 (1979) 257, 1979.
Inspire Record 140695 DOI 10.17182/hepdata.50276

We report the measurement of the differential cross section of the reaction γ +p→π0 +p at a photon energy of 1.4 GeV and pion c.m. angles between 60 and 175 degrees. The angular distribution confirms the simple quark model prediction of a pure magnetic excitation of theF37 (1950) resonance.

1 data table
Table 1

No description provided.


Photoproduction of Neutral Pions at Backward Angles in the Resonance Region and the $\eta$ - Cusp

Althoff, K.H. ; Gies, M. ; Kaul, O. ; et al.
Z.Phys.C 1 (1979) 327, 1979.
Inspire Record 140694 DOI 10.17182/hepdata.50217

At the Bonn 2.5 GeV electron synchrotron we have measured the differential cross section of the reaction γp→π0p at a pion CM angle of 170° and at photon energiesKγ between 0.6 and 1.8 GeV. In comparison to previous measurements the accuracy of the data was improved substantially. For the first time in neutral pion photoproduction a cusp structure at the η-threshold has been confirmed [1].

1 data table
Table 1

No description provided.


Photoproduction of K+ Lambda0 on Polarized Protons

Althoff, K.H. ; Gies, M. ; Herr, H. ; et al.
Nucl.Phys.B 137 (1978) 269-275, 1978.
Inspire Record 135345 DOI 10.17182/hepdata.35095

The target asymmetry for the reaction γ p → K + Λ 0 was measured at the Bonn 2.5 GeV synchroton. Data were taken at a fixed kaon c.m. angle of 90° and at photon energies between 1.1 and 1.3 GeV. The kaons were detected in a large aperture magnetic spectrometer.

1 data table
Table 1

5 PCT TARGET POLARIZATION UNCERTAINTY INCLUDED IN QUOTED ERRORS.


Photoproduction of Pions on Polarized Protons and Neutrons in the Second Resonance Region

Althoff, K.H. ; Gies, M. ; Herr, H. ; et al.
Nucl.Phys.B 131 (1977) 1-6, 1977.
Inspire Record 119995 DOI 10.17182/hepdata.35224

Measurements of the target asymmetry T = ( σ ↑ − σ ↓)/( σ ↑ + σ ↓) for the reactions γ p → π + n and γ n → π − p at a fixed photon energy of 850 MeV and pion c.m. angles between 70° and 150° are reported. The data are compared to the previously measured angular distribution at 700 MeV.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Photoproduction of Negative Pions on Polarized Neutrons in the Region of the Second Resonance

Althoff, K.H. ; Conrad, R. ; Gies, M. ; et al.
Nucl.Phys.B 116 (1976) 253-260, 1976.
Inspire Record 109397 DOI 10.17182/hepdata.35639

A polarized neutron target was used at the Bonn 2.5 GeV Synchrotron to measure the target asymmetry for the reaction γ n↑→ π − p at a fixed photon energy of 700 MeV and pion c.m. angles between 50° and 140°. The pions were detected in a large aperture magnetic spectrometer. The data show a structure which is quite different from the distribution previously measured for the reaction γ p↑→ π + n.

1 data table
Table 1

No description provided.


Angular Distribution of the Target Asymmetry on Polarized Protons for the Reaction gamma p (Polarized) --> pi+ n at a Photon Energy of 700-MeV

Althoff, K.H. ; Conrad, R. ; Gies, M. ; et al.
Phys.Lett.B 63 (1976) 107-110, 1976.
Inspire Record 114330 DOI 10.17182/hepdata.27654

At the Bonn 2.5 GeV electron synchrotron the angular distribution of the target asymmetry T = (σ↑ − σ↓) (σ↑ + σ↓) for the reaction γp↑ → π + n was measured at a mean photon energy of 700 MeV and pion CM-angles from 50° to 155°. The combination of a 3 He-cryostat, polarizing the free protons in the target up to 65%, with a large acceptance magnet for pion detection led to statistical errors of the target asymmetry comparable with those of cross section measurements.

1 data table
Table 1

No description provided.