Summary
Very simple algorithms are established which allow calculation of contributions to electromagnetic vertex part form factors in the limit of zero photon momentum, starting from any allowed combination of γ-matrices and traces. These algorithms are particularly useful when large numbers of terms are being evaluated with the help of a computer.
Riassunto
Si determinano degli algoritmi molto semplici che permettono il calcolo dei contributi ai fattori di forma della parte di vertice elettromagnetica nel limite di impulsi del fotone nulli, partendo da una combinazione permessa di matrici γ e tracce. Questi algoritmi si dimostrano particolarmente utili quando si debba calcolare un gran numero di termini con un calcolatore.
Реэюме
Исходя иэ проиэвольной раэрещенной комбинацииγ-матриц и щпуров, устанавливаются очень простые алгоритмы, которые поэволяют вычислить вклады в форм-факторы злектромагнитной верщинной части в пределе нулевого импульса фотона. В частности, зти алгоритмы полеэны, когда больщое число членов оценивается с помошью вычислительной мащины.
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References
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J. S. R. Chisholm: Thesis (Cambridge, 1952).
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Research sponsored in part by the European Office of Aerospace Research, United States Air Force, Grant No. AF EOAR 66–51.
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Chisholm, J.S.R. Algorithms for zero-momentum vertex parts. Nuov Cim A 1, 777–782 (1971). https://doi.org/10.1007/BF02734397
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DOI: https://doi.org/10.1007/BF02734397