Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 4: Hadron Structure and Spectroscopy I

HK 4.3: Vortrag

Montag, 16. März 2009, 15:00–15:15, H-ZO 20

Measurement of the γ n → K⁺ Σ⁻ at Jefferson Lab — •Sergio Anefalos Pereira — Instituto Nazionali di Fisica Nucleare, Laboratori Nazionali di Frascati, Via E. Fermi,40 -I 00044 Frascati (Roma)

A comprehensive study of the electromagnetic strangeness production has been undertaken at Jefferson Lab. Among the six elementary strangeness photoproduction reactions on the nucleon, γ n → K⁰ Λ, γ n → K⁰ Σ⁰, γ n → K⁺ Σ⁻, γ p → K⁺ Λ, γ p → K⁺ Σ⁰, γ p → K⁰ Σ⁺, there are cross section data for all γ p reactions. For the γ n reactions, there is only data for the γ n → K⁺ Σ⁻ channel, and in a very limited energy and angular range. The actual theoretical predictions for the strangeness photoproduction cross section on neutron differ widely depending on the data set fitted for the proton channels.

Here will be presented preliminary γ n (p) → K⁺ Σ⁻ (p) differential cross section measured with the CLAS large acceptance spectrometer at the Jefferson Lab Hall-B, over a wide range of kaon scattering angles (10^∘ and 140^∘) using a deuterium target with a tagged photon beam in the energy range from 1.0 up to 3.6 GeV. These measurements can be used to improve the predictive power of the actual theoretical description of hyperon photoproduction by adding more constraints to the Kaon-Hyperon-Nucleon coupling constants.