Regular Article - Experimental Physics
Study of the reactions γp → K+ Σ± π∓ at photon energies up to 2.6 GeV
Physikalisches Institut der Universität Bonn, Bonn, Germany
2 Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Bonn, Germany
Revised: 28 January 2011
Published online: 4 April 2011
The reactions γp → K+ Σ± π∓ were studied with the SAPHIR detector using a tagged photon beam at the electron stretcher facility ELSA in Bonn. The decays Σ − → nπ − and Σ + → nπ +, pπ 0 were fully reconstructed. Reaction cross-sections were measured as a function of the photon energy from threshold up to 2.6 GeV with considerably improved statistics compared to a previous bubble chamber measurement. The cross-sections rise monotonically with increasing photon energy. The two-particle mass distributions of Σ ± π ∓ and K + π − show substantial production of resonant states.
© SIF, Springer-Verlag Berlin Heidelberg, 2011