https://doi.org/10.1140/epja/i2007-10552-9
Regular Article - Experimental Physics
K0πand K*0Σ+ photoproduction off the proton
1
II. Physikalisches Institut, Universität Gießen, Germany
2
Kernfysisch Versneller Institut, Groningen, The Netherlands
3
Physikalisches Institut, Universität Bonn, Germany
4
Helmholtz-Institut für Strahlen- u. Kernphysik, Universität Bonn, Germany
5
Petersburg Nuclear Physics Institute, Gatchina, Russia
6
Department of Physics, Florida State University, Tallahassee, FL, USA
7
Physikalisches Institut, Universität Basel, Switzerland
* e-mail: Mariana.Nanova@physik.uni-giessen.de
Received:
17
December
2007
Accepted:
10
March
2008
Published online:
9
April
2008
The exclusive reactions γp → K *0Σ+(1189) and γp → K 0π0Σ+(1189) , leading to the p 4π0 final state, have been measured with a tagged photon beam for incident energies from threshold up to 2.5GeV. The experiment has been performed at the tagged photon facility of the ELSA accelerator (Bonn). The Crystal Barrel and TAPS detectors were combined to a photon detector system of almost 4π geometrical acceptance. Differential and total cross-sections are reported. At energies close to the threshold, a flat angular distribution has been observed for the reaction γp → K 0π0Σ+ suggesting dominant s -channel production. Σ*(1385) and higher-lying hyperon states have been observed. An enhancement in the forward direction in the angular distributions of the reaction γp → K *0Σ+ indicates a t -channel exchange contribution to the reaction mechanism. The experimental data are in reasonable agreement with recent theoretical predictions.
PACS: 13.60.Le Meson production – / 25.20.Lj Photoproduction reactions – / 14.20.Jn Hyperons –
© Società Italiana di Fisica and Springer-Verlag, 2008