Numerical stability in hard and infrared regions in OpenLoops2

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• Jean-Nicolas Lang (Zurich)
• Thursday 30 May 2019, 16:00-17:00
• Ryle Seminar Room no. 930, Rutherford Building, Cavendish Laboratory.

If you have a question about this talk, please contact Mathieu Pellen.

I will introduce the new OpenLoops release “OpenLoops2”, a fully automated algorithm for extreme one-loop computations. This new release features public process libraries for complete one-loop corrections in the SM using a new helicity treatment and a new reduction method for tree-loop interferences. The simplicity and flexibility of the so-called on-the-fly reduction allows to isolate numerical instabilities in the amplitude for critical phase-space regions. I will address in detail sources of numerical instabilities in hard and infrared regions in the before mentioned framework and present analytic and numerical methods to cure them. Finally, I will present performance and stability benchmarks and compare with other state-of-the art reduction methods.

The slides of the presentation can be found here

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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