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Bounds for the sum of ladder graphs and the occurence of ghosts |
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| Authors: | G Wanders |
| Institution: | 1. Laboratoire de l''Accélérateur Linéaire, Orsay, France;2. CERN, Geneva, Switzerland |
| Abstract: | Rigorous upper and lower bounds for the sum of scalar ladder graphs are derived. These bounds are compatible with Regge behaviour but reveal the existence of ghosts for sufficiently large coupling constants. |
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