H Löhner

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  • I Horn, A V Anisovich, G Anton, R Bantes, O Bartholomy, R Beck +47 others
  • 2008
The reaction γp → pπ 0 η has been studied with the CBELSA detector at the tagged photon beam of the Bonn electron stretcher facility. The reaction shows contributions from ∆ + (1232)η, N (1535) + π 0 and pa0(980) as intermediate states. A partial wave analysis suggests that the reaction proceeds via formation of six for which pole positions and decay(More)
The restoration of chiral symmetry and its subsequent breaking through a phase transition has been predicted to create regions of Disoriented Chiral Condensates (DCC). This phenomenon has been predicted to cause anomalous fluctuations in the relative production of charged and neutral pions in high-energy hadronic and nuclear collisions. The WA98 experiment(More)
  • D Elsner, B Bantes, O Bartholomy, D E Bayadilov, R Beck, Y A Beloglazov +52 others
  • 2008
Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in π 0-photoproduction off the proton Abstract. At the electron accelerator ELSA a linearly polarised tagged photon beam is produced by coherent bremsstrahlung off a diamond crystal. Orientation and energy range of the linear polarisation can be deliberately chosen by accurate(More)
Event-by-event fluctuations in the multiplicities of charged particles and photons at SPS energies are discussed. Fluctuations are studied by controlling the centrality of the reaction and rapidity acceptance of the detectors. Results are also presented on the event-by-event study of correlations between the multiplicity of charged particles and photons to(More)
Results on the target mass dependence of proton and pion pseudorapidity distributions and of their azimuthal correlations in the target rapidity range −1.73 ≤ η ≤ 1.32 are presented. The data have been taken with the Plastic-Ball detector setup for 4.9 GeV p + Au collisions at the Berkeley BEVALAC and for 200 A·GeV/c p-, O-, and S-induced reactions on(More)
Preface This document is the Technical Design Report covering the two large spectrometer magnets of the PANDA detector setup. It shows the conceptual design of the magnets and their anticipated performance. It precedes the tender and procurement of the magnets and, hence, is subject to possible modifications arising during this process. The use of(More)
  • M Fuchs, A V Anisovich, G Anton, R Bantes, O Bartholomy, R Beck +42 others
  • 2009
Decays of baryon resonances in the second and the third resonance region into Nπ 0 π 0 are studied by photoproduction of two neutral pions off protons. Partial decay widths of N* and ∆* resonances decaying into ∆(1232)π, N(ππ) S , N(1440)P 11 π, and N(1520)D 13 π are determined in a partial wave analysis of this data, and data from other reactions. Several(More)
Photoproduction of π 0 mesons was studied with the Crystal-Barrel detector at ELSA for incident energies from 300 MeV to 3 GeV. Differential cross sections dσ/dΩ, dσ/dt, and the total cross section are presented. For Eγ < 3 GeV, the angular distributions agree well with the SAID parametrization. At photon energies above 1.5 GeV, a strong forward peaking(More)
Photon energy spectra up to the kinematic limit have been measured in 190 MeV proton reactions with light and heavy nuclei to investigate the influence of the multiple-scattering process on the photon production. Relative to the predictions of models based on a quasifree production mechanism, a strong suppression of bremsstrahlung is observed in the(More)
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