Calculation of infrared-divergent Feynman diagrams with zero mass threshold

Fleischer J, Smirnov VA, Frink A, Korner J, Kreimer D, Schilcher K, Tausk JB (1998)
EUROPEAN PHYSICAL JOURNAL C 2(4): 747-756.

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Abstract
Two-loop vertex Feynman diagrams with infrared and collinear divergences are investigated by two independent methods. On the one hand, a method of calculating Feynman diagrams from their small momentum expansion [1] extended to diagrams with zero mass thresholds [2] is applied. On the other hand, a numerical method based on a two-fold integral representation is used [3], [4]. The application of the latter method is possible by using lightcone coordinates in the parallel space. The numerical data obtained with the two methods are in impressive agreement.
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Fleischer J, Smirnov VA, Frink A, et al. Calculation of infrared-divergent Feynman diagrams with zero mass threshold. EUROPEAN PHYSICAL JOURNAL C. 1998;2(4):747-756.
Fleischer, J., Smirnov, V. A., Frink, A., Korner, J., Kreimer, D., Schilcher, K., & Tausk, J. B. (1998). Calculation of infrared-divergent Feynman diagrams with zero mass threshold. EUROPEAN PHYSICAL JOURNAL C, 2(4), 747-756.
Fleischer, J., Smirnov, V. A., Frink, A., Korner, J., Kreimer, D., Schilcher, K., and Tausk, J. B. (1998). Calculation of infrared-divergent Feynman diagrams with zero mass threshold. EUROPEAN PHYSICAL JOURNAL C 2, 747-756.
Fleischer, J., et al., 1998. Calculation of infrared-divergent Feynman diagrams with zero mass threshold. EUROPEAN PHYSICAL JOURNAL C, 2(4), p 747-756.
J. Fleischer, et al., “Calculation of infrared-divergent Feynman diagrams with zero mass threshold”, EUROPEAN PHYSICAL JOURNAL C, vol. 2, 1998, pp. 747-756.
Fleischer, J., Smirnov, V.A., Frink, A., Korner, J., Kreimer, D., Schilcher, K., Tausk, J.B.: Calculation of infrared-divergent Feynman diagrams with zero mass threshold. EUROPEAN PHYSICAL JOURNAL C. 2, 747-756 (1998).
Fleischer, Jochem, Smirnov, VA, Frink, A, Korner, J, Kreimer, D, Schilcher, K, and Tausk, JB. “Calculation of infrared-divergent Feynman diagrams with zero mass threshold”. EUROPEAN PHYSICAL JOURNAL C 2.4 (1998): 747-756.
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