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    Lagrangian interaction and Feyman propagator

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    1. Consider a real scalar field phi with interaction Largrangian L_int = (p/(3!))phi^3. What is the mass dimension of u? Evaluate the leading u-dependent contributions to the following equation: (see attached file)

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    Solution Summary

    This solution calculates the lowest order of perturbation in terms of a Feynman propagator.