Erlangen 2001 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 3: Theorie I

HK 3.5: Talk

Monday, March 19, 2001, 18:00–18:15, B

Nucleon form factors and a composite scalar diquark — •Jacques Bloch¹, Craig Roberts², and Sebastian Schmidt¹ — ¹Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen — ²Argonne Nat’l Lab., PHY/203, Argonne, Il 60439, USA

We employ a covariant, composite scalar diquark, Fadde’ev amplitude model for the nucleon to calculate pseudoscalar, isoscalar- and isovector-vector, axial-vector and scalar nucleon form factors. The last yields the nucleon sigma-term and on-shell sigma-nucleon coupling. The calculated form factors are soft, and the couplings are in good agreement with experiment and other model calculations. [Supported by DFG (SCHM 1342/3-1)]