Recent Progress in the Golem Project

Cullen, G.; Greiner, Nicolas; Guffanti, A.; Guillet, J. Ph.; Heinrich, G.; Karg, Stefan; Kauer, N.; Kleinschmidt, Tobias; Pilon, E.; Reiter, Thomas; Reuter, Jürgen; Rodgers, Mark; Wigmore, Ioan

doi:10.1016/j.nuclphysbps.2010.08.021

Cited by 15 publications

(13 citation statements)

References 66 publications

(81 reference statements)

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“…Yet, in 2009 this threshold was successfully passed: as the result of additional technical improvements, techniques based on Feynman diagrams were successfully used to describe pp → ttbb and pp → W + W − bb processes at next-to-leading in perturbative QCD [2,12]. Similar ideas are implemented in the GOLEM program [61,62] and first results on the next-to-leading order computation of processes with six external particles have been presented by the GOLEM collaboration.…”

Section: Advanced Diagrammatic Methodsmentioning

confidence: 99%

One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts

et al. 2012

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The success of the experimental program at the Tevatron re-inforced the idea that precision physics at hadron colliders is desirable and, indeed, possible. The Tevatron data strongly suggests that one-loop computations in QCD describe hard scattering well. Extrapolating this observation to the LHC, we conclude that knowledge of many short-distance processes at next-to-leading order may be required to describe the physics of hard scattering. While the field of oneloop computations is quite mature, parton multiplicities in hard LHC events are so high that traditional computational techniques become inefficient. Recently new approaches based on unitarity have been developed for calculating one-loop scattering amplitudes in quantum field theory. These methods are especially suitable for the description of multi-particle processes in QCD and are amenable to numerical implementations. We present a systematic pedagogical description of both conceptual and technical aspects of the new methods.

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Section: Advanced Diagrammatic Methodsmentioning

confidence: 99%

One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts

et al. 2012

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“…[38][39][40][41][42][43]. The concepts that lead to these advances have been recently reviewed in [44].…”

Section: Introductionmentioning

confidence: 99%

Automated one-loop calculations with GoSam

et al. 2012

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We present the program package GOSAM which is designed for the automated calculation of one-loop amplitudes for multi-particle processes in renormalisable quantum field theories. The amplitudes, which are generated in terms of Feynman diagrams, can be reduced using either D-dimensional integrand-level decomposition or tensor reduction. GOSAM can be used to calculate one-loop QCD and/or electroweak corrections to Standard Model processes and offers the flexibility to link model files for theories Beyond the Standard Model. A standard interface to programs calculating real radiation is also implemented. We demonstrate the flexibility of the program by presenting examples of processes with up to six external legs attached to the loop.

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“…Spinors we manipulate algebraically resorting to spinor-helicity methods [6], while we deal with color algebra by means of a conventional color flow decomposition technique [7]. Tensor structures we decompose via a modified Passarino-Veltman scheme in the framework of GOLEM [8]. Both ultraviolet (UV) and infrared (IR) singularities from the loop integrals we regulate employing the standard 'tHooft-Veltman dimensional regularization prescription in n = 4 − 2ε dimensions.…”

Section: Code Structurementioning

confidence: 99%

MadGolem automating NLO calculations for New Physics

López-Val

Gonçalves-Netto

Plehn

et al. 2013

Proceedings of “Loops and Legs in Quantum Field Theory ” 11th DESY Workshop on Elementary Particle Physics — PoS(LL2012)

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With the LHC close to complete its 8 TeV run, the experimental searches have already started to probe the vast beyond-the-standard Model scenery. Providing next-to-leading order (NLO) predictions for the major new physics discovery channels is therefore a most pressing request to particle phenomenologists these days. MADGOLEM is a new computational tool that automates NLO calculations of generic 2 → 2 new physics processes in the MADGRAPH/GOLEM framework. In this contribution we concisely describe the structure and performance of the code, with particular focus on the generation of the renormalized one-loop amplitudes and the automatized subtraction of infrared and on-shell divergences. We briefly survey the many dedicated tests of all these aspects and outline some applications to LHC phenomenology.

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Recent Progress in the Golem Project

Cited by 15 publications

References 66 publications

One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts

One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts

Automated one-loop calculations with GoSam

MadGolem automating NLO calculations for New Physics

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