Automating dipole subtraction for QCD NLO calculations

By T. Gleisberg, F. Krauss. 2007

261 citations recorded by the source corpus.

In this publication the construction of an automatic algorithm to subtract infrared divergences in real QCD corrections through the Catani–Seymour dipole subtraction method [1,2] is reported. The resulting computer code has been implemented in the matrix element generator AMEGIC++ [3]. This will allow for the automatic generation of dipole subtraction terms and their integrals over the one-parton emission phase space for any given process. If the virtual matrix element is provided as well, this then directly leads to an NLO QCD parton level event generator.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0357d3e2d691e0a925c26c450c7d359a10949600

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In Nuclear and High Energy Physics

1. Atlas Collaboration
2. Cms Collaboration
3. Gudrun Heinrich
4. M. Schönherr
5. Ansgar Denner
6. Stefan Dittmaier
7. Fabio Maltoni
8. F. Krauss

Citations in the corpus

• General-purpose event generators for LHC physics (2011, methodology): “The Amegic++ matrix-element generator has the further functionality to construct dipole-subtraction terms and their integrals over the one-parton emission phase space in the Catani– Seymour formalism [19] for arbitrary Standard Model processes [300].”
• NLO electroweak automation and precise predictions for W + multijet production at the LHC (2014, methodology): “The second implementation of QED bremsstrahlung is based on the Sherpa Monte Carlo generator [46, 47], which was used in the pioneering NLO QCD calculations of vector-boson plus multijet production [20–25], as well as for their matching to the parton shower [62] and the merging of multijet final sta”
• UFO - The Universal FeynRules Output (2011, methodology): “…made in the automation of the computation of next-to-leading order matrix elements, both regarding the generation of the real corrections with the appropriate subtraction terms [31,32,33,34,35,36], and the development of algorithms for calculating loop amplitudes numerically [37,38,39,40,41,42].”
• A comprehensive approach to new physics simulations (2009, methodology): “First the generation of the real corrections with the appropriate subtractions has be achieved in an automatic way [17, 18, 19, 20, 21].”
• Les Houches 2017: Physics at TeV Colliders Standard Model Working Group Report (2017, methodology): “In the SHERPA framework the infrared divergences appearing in the real-emission are treated by the Catani–Seymour dipole-subtraction method [187, 489, 496].”
• Automation of next-to-leading order computations in QCD: the FKS subtraction (2009, background): “[28] (restricted to massless SM particles), and very recently in ref.”
• QCD matrix elements + parton showers. The NLO case (2012, methodology): “In fact, it is worth stressing here that within SHERPA, indeed the definitions of t and Q are equivalent.”
• Handbook of LHC Higgs Cross Sections: 3. Higgs Properties (2013, methodology): “28 3.4 HiggspT distribution using different generators 3.4.1 Comparison amongHRES, POWHEG, M ADGRAPH , AMC@NLO , SHERPA without Heavy Quark mass effect7 Results of Higgs boson searches performed at 7 TeV were usingPOWHEG as main generator for the gluon fusion process.”
• Event generation with SHERPA 1.1 (2008, methodology): “implemented within AMEGIC++ [126], and a new matrix-element generator for very large multiplicities, COMIX [57], has been constructed.”
• NLO QCD matrix elements + parton showers in e+e− → hadrons (2012, methodology): “Automated dipole subtraction [29] and the Binoth–Les Houches interface [30] are employed to obtain parton-level events at next-to-leading order with virtual corrections provided by the BLACKHAT library [31–34].”
• Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report (2014, methodology): “2 GoSam+Sherpa specifics Within Sherpa [166] the tree amplitudes for the Born contributions and real corrections were obtained using the automatic amplitude generator Amegic [418], which also automatically generates the subtraction terms and their integrated counterpart using an implementation [419]”
• A critical appraisal of NLO+PS matching methods (2011, methodology): “The event generator SHERPA [32] sets the framework for this study, including its automated MC@NLO implementation, the matrix-element generator AMEGIC++ [33], an automated implementation [34] of the Catani-Seymour dipole subtraction method [15] and the parton shower model described in [26, 29].”