Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 11: Structure of Baryons, Mesons II

HK 11.2: Vortrag

Montag, 16. März 1998, 14:15–14:30, J

Measurement of the Σ⁻ and π⁻ charge radii in the WA89 experiment at CERN [1] — •F. Dropmann — Max-Planck Institut f"ur Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

In order to determine the π⁻– and Σ⁻–charge radii the differential cross section dσ/dQ² for π⁻– and Σ⁻– electron scattering at small four-momentum transfers Q² were measured. Σ⁻ and π⁻ scattering events were identified and characterized by means of a maximum likelihood method. Comparing the extracted <r²>(π⁻) with existing data on the pion radius we can crosscheck this procedure. Applying this method to Σ⁻ – electron scattering, for the first time the influence of a strange quark on the charge radius of a baryon can be explored.

[1] supported by the BMBF under Nr.05 5HD15I, 06 HD524I and 06 MZ5265