Phenomenology of Σ+→pℓ+ℓ− and the structure of the weak non-leptonic Hamiltonian |
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Authors: | L Bergström R Safadi P Singer |
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Institution: | 1. Department of Theoretical Physics, University of Stockholm, S-11346, Stockholm, Sweden 2. Department of Physics, Technion-Israel Institute of Technology Haifa, Israel 3. CERN, CH-1211, Geneva 23, Switzerland
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Abstract: | The problem of the radiative non-leptonic weak baryon decays is reviewed in light of the new experimental findings. With the aim of exploring the structure of the weak non-leptonic Hamiltonian, we present a detailed phenomenological analysis of Σ+→p?+?? transitions. Lower and upper limits for rates derivable with standard physics are determined as Γ(Σ+→pe + e ?)/Σ+→pγ)≧7.2×10?3 and 1/1210? Γ(Σ+→pe + e +)/Γ(Σ+→pe + e ?)?1/120. From existing data on Σ+→pe + e ? we obtain limits on the values of the charge radius form factors |c 1/b 1|?5;|c 2/b 1|? 10, where the magnetic form factor is given by the Σ+→dγ, decay asb 1(0)= 6.9±0.9 MeV. The short distance contribution of the QCD corrected single quarks→dλ transition is shown not to play a dominant role in these decays. |
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