K0πand K*0Σ+ photoproduction off the proton |
| |
Institution: | (1) II. Physikalisches Institut, Universit?t Gie?en, Germany;(2) Kernfysisch Versneller Institut, Groningen, The Netherlands;(3) Physikalisches Institut, Universit?t Bonn, Germany;(4) Helmholtz-Institut für Strahlen- u. Kernphysik, Universit?t Bonn, Germany;(5) Petersburg Nuclear Physics Institute, Gatchina, Russia;(6) Department of Physics, Florida State University, Tallahassee, FL, USA;(7) Physikalisches Institut, Universit?t Basel, Switzerland |
| |
Abstract: | 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. |
| |
Keywords: | 13 60 Le Meson production 25 20 Lj Photoproduction reactions 14 20 Jn Hyperons |
本文献已被 SpringerLink 等数据库收录! |
|