Abstract
The nucleon excitation spectrum is investigated at the Crystal Barrel experiment through different photoproduction reactions. The photoproduction of single η′ mesons off protons is of particular importance since it offers the opportunity to study the high-lying resonances and therefore the part of the nucleon excitation spectrum where many missing resonances are predicted. Preliminary results of the double polarization observable E and the decomposition of the total cross section into its helicity-dependent components σ1/2 and σ3/2 in η′-photoproduction are presented for beam energies from 1450 MeV to 2320 MeV.
Highlights
Precise knowledge of the nucleon excitation spectra provides information about the dynamics inside the nucleon and the according relevant degrees of freedom
The nucleon excitation spectrum is investigated at the Crystal Barrel experiment through different photoproduction reactions
The high mass of allows to explore the high mass region of the nucleon excitation spectrum, where various model calculations, that have been conducted in the past [1, 2], predict more excited states than there have been measured so far
Summary
Precise knowledge of the nucleon excitation spectra provides information about the dynamics inside the nucleon and the according relevant degrees of freedom. The high mass of allows to explore the high mass region (mN ∗ > 1890 MeV) of the nucleon excitation spectrum, where various model calculations, that have been conducted in the past [1, 2], predict more excited states than there have been measured so far.
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