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SUMMARY:Numerical stability in hard and infrared regions in OpenLoops2 - J
 ean-Nicolas Lang (Zurich)
DTSTART:20190530T150000Z
DTEND:20190530T160000Z
UID:TALK121330@talks.cam.ac.uk
CONTACT:Mathieu Pellen
DESCRIPTION:I will introduce the new OpenLoops release "OpenLoops2"\, a fu
 lly automated\nalgorithm for extreme one-loop computations. This new relea
 se features public\nprocess libraries for complete one-loop corrections in
  the SM using a new helicity\ntreatment and a new reduction method for tre
 e-loop interferences.\nThe simplicity and flexibility of the so-called on-
 the-fly reduction allows to\nisolate numerical instabilities in the amplit
 ude for critical phase-space\nregions. I will address in detail sources of
  numerical instabilities in hard\nand infrared regions in the before menti
 oned framework and present analytic and\nnumerical methods to cure them.\n
 Finally\, I will present performance and stability benchmarks and compare 
 with\nother state-of-the art reduction methods.\n\nThe slides of the prese
 ntation can be found "here":http://www.hep.phy.cam.ac.uk/~conference/Lang_
 31_05_19.pdf
LOCATION:Ryle Seminar Room no. 930\, Rutherford Building\, Cavendish Labor
 atory
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