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Modern Summation Methods and the Computation of 2- and 3-loop Feynman Diagrams
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math-phhep-phhep-thmath.MP
keywords
loopdiagramsfeynmanmethodssummationsumstermscalculations
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By symbolic summation methods based on difference fields we present a general strategy that transforms definite multi-sums, e.g., in terms of hypergeometric terms and harmonic sums, to indefinite nested sums and products. We succeeded in this task with all our concrete calculations of 2--loop and 3--loop massive single scale Feynman diagrams with local operator insertion.
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