Direct numerical approach to one-loop amplitudes

Klajn, Bruno Direct numerical approach to one-loop amplitudes. In: Seminar Zavoda za teorijsku fiziku (23 May 2016 - 23 May 2016) Institut Ruđer Bošković, Zagreb, Hrvatska.

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Abstract

We present a completely numerical method of calculating one-loop amplitudes. Our approach is built upon two different existing methods: the contour-deformation and the extrapolation method. Taking the best features of each of them, we devised an intuitive, stable and robust procedure which circumvents the problem of large cancellations and related numerical instabilities, by calculating the complete amplitude at once. After extensively testing our method on various one-loop processes, we report results on the 2γ → (N − 2)γ benchmark process.

Item Type:	Unpublished conference/workshop items or lecture materials
Uncontrolled Keywords:	one-loop amplitudes; contour-deformation method; extrapolation method;
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Physics
Divisions:	Theoretical Physics Division
Depositing User:	Kristina Ciglar
Date Deposited:	24 May 2016 09:27
URI:	http://fulir.irb.hr/id/eprint/2830

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