Michael Ostrick

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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)
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)
The Dalitz decay π 0 → e + e − γ has been measured in the γp → π 0 p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the π 0 electromagnetic transition form factor, a π = 0.030 ± 0.010 tot , is in agreement with existing measurements of this decay and with recent theoretical(More)
  • A Thiel, V Sokhoyan, +61 authors A Wilson
  • 2015
The Nπ^{0}π^{0} decays of positive-parity N^{*} and Δ^{*} resonances at about 2 GeV are studied at ELSA by photoproduction of two neutral pions off protons. The data reveal clear evidence for several intermediate resonances: Δ(1232), N(1520)3/2^{-}, and N(1680)5/2^{+}, with spin parities J^{P}=3/2^{+}, 3/2^{-}, and 5/2^{+}. The partial wave analysis (within(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)
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