Study of the reactions γp → K + Σ ± π ∓ at photon energies up to 2.6 GeV
European Physical Journal A(2011)
Abstract
The reactions γ p → 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.
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Key words
Background Subtraction,Excitation Function,Primary Vertex,Photon Energy Range,Decay Vertex
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