Recursive generation of one-loop amplitudes in the Standard Model

By Stefano Actis, Ansgar Denner, Lars Hofer, A. Scharf, Sandro Uccirati. 2012

213 citations recorded by the source corpus.

A bstractWe introduce the computer code Recola for the recursive generation of tree-level and one-loop amplitudes in the Standard Model. Tree-level amplitudes are constructed using off-shell currents instead of Feynman diagrams as basic building blocks. One-loop amplitudes are represented as linear combinations of tensor integrals whose coefficients are calculated similarly to the tree-level amplitudes by recursive construction of loop off-shell currents. We introduce a novel algorithm for the treatment of colour, assigning a colour structure to each off-shell current which enables us to recursively construct the colour structure of the amplitude efficiently. Recola is interfaced with a tensor-integral library and provides complete one-loop Standard Model amplitudes including rational terms and counterterms. As a first application we consider Z + 2 jets production at the LHC and calculate with Recola the next-to-leading-order electroweak corrections to the dominant partonic channels.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e71c87e712f2b57c42713e9dc0a5f3209ec81cc0

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Citations in the corpus

NLO electroweak automation and precise predictions for W + multijet production at the LHC (2014, methodology): “Very recently, using the automated one-loop generator Recola [37, 38], Denner et al.”
Collier: A fortran-based complex one-loop library in extended regularizations (2016, methodology): “While the methods described so far are formulated in the literature in terms of the Lorentz-invariant coefficients TNi1...iP , a new generation of NLO generators, such as OpenLoops and Recola, needs the components of the full tensors TN,µ1···µP .”
The automation of next-to-leading order electroweak calculations (2018, methodology): “Indeed, although not as comprehensive as for QCD computations, there has been steady progress in the automation of EW NLO corrections, for both one-loop and realemission contributions, by collaborations such as RECOLA [8, 9] with Sherpa [10, 11], OpenLoops [12] with Sherpa, GoSam [13, 14] with eithe”
Les Houches 2017: Physics at TeV Colliders Standard Model Working Group Report (2017, methodology): “There has been progress towards a complete automation of NLOEW corrections within one-loop programs such as OpenLoops, GoSam, Recola, MadLoop and NLOX, which has led to the completion of many items from the 2013 list.”
Electroweak and QCD corrections to top-pair hadroproduction in association with heavy bosons (2015, unknown): “[34–37] for recent results).”
GoSam-2.0: a tool for automated one-loop calculations within the Standard Model and beyond (2014, background): “The development of automated NLO tools has seen tremendous progress in the past years, leading to public codes [3–7] which are able to produce multi-particle NLO predictions for user-defined processes, or to dedicated frameworks [8–15], which allowed to produce an impressive collection of NLO proces”
A brief introduction to modern amplitude methods (2013, unknown): “These new, efficient methods have enabled the construction of a variety of automated computer programs for generating one-loop amplitudes, including CutTools [47], BlackHat [35], Rocket [48], SAMURAI [49], NGluon [50], MadLoop [51], HELACNLO [52], GoSam [53], Open Loops [54] and Recola [55].”
Event generation with Sherpa 2.2 (2019, methodology): “Renormalised QCD virtual corrections are obtained either through dedicated interfaces from programs and libraries like BLACKHAT [13, 70, 71, 72], MADGRAPH [73, 74], OPENLOOPS [14] and RECOLA [75], or through the generic Binoth Les-Houches Accord”
Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report (2016, methodology): “Recola was the first automated tool to calculate EW NLO corrections [284].”
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations (2014, background): “The number of codes which have been developed, either restricted to leading order (LO henceforth) predictions [38–53], or including NLO capabilities [54–82] is truly staggering.”
Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report (2014, methodology): “In the last two years, we have seen the NLO calculation of complex multi-leg processes such as for the production of 5 jets [1], W + 5 jets [2], and Higgs + 3 jets [3] as well as the further development of general purpose NLO codes such as GoSaM [4], HELAC-NLO [5], MadLoop [6], OpenLoops [7], and Re”