Polarizing the dipoles

By Michal Czakon, Costas G. Papadopoulos, Malgorzata Worek. 2009

172 citations recorded by the source corpus.

We extend the massless dipole formalism of Catani and Seymour, as well as its massive version as developed by Catani, Dittmaier, Seymour and Trocsanyi, to arbitrary helicity eigenstates of the external partons. We modify the real radiation subtraction terms only, the primary aim being an improved efficiency of the numerical Monte Carlo integration of this contribution as part of a complete next-to-leading order calculation. In consequence, our extension is only applicable to unpolarized scattering. Upon summation over the helicities of the emitter pairs, our formulae trivially reduce to their original form. We implement our extension within the framework of \textsc{Helac-Phegas}, and give some examples of results pertinent to recent studies of backgrounds for the LHC. The code is publicly available. Since the integrated dipole contributions do not require any modifications, we do not discuss them, but they are implemented in the software.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1a66a72cbb436dd60353694a32febb8df68c7bf8

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Citations in the corpus

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.”
Electroweak radiative corrections for collider physics (2019, methodology): “Dipole subtraction has been successfully automated for generic applications in NLO calculations in various variants [381, 393–397] and is part of several multipurpose Monte Carlo generators.”
A comprehensive approach to new physics simulations (2009, methodology): “First the generation of the real corrections with the appropriate subtractions has been achieved in an automatic way [17–22].”
MadAnalysis 5, a user-friendly framework for collider phenomenology (2012, methodology): “n the automation of next-to-leading-order computations. On the one hand, the generation of the real emission contributions with the appropriate subtraction terms has been achieved in an automatic way [16, 17, 18, 19, 20, 21]. On the other hand, several algorithms addressing the numerical calculation”
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].”
Automation of next-to-leading order computations in QCD: the FKS subtraction (2009, background): “[29] (which includes the treatment of massive SM”
Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order (2010, methodology): “Besides the cancellation of divergences, which we have mentioned in the previous section, we have also explored the independence of the results on the unphysical cutoff in the dipole subtraction phase space (see [42] and references therein for details) to further check our calculation.”
MadGraph 5: going beyond (2011, methodology): “The generation of the real corrections with the appropriate subtractions has been achieved in an automatic way [21–26].”
Standard Model Higgs boson production in association with a top anti-top pair at NLO with parton showering (2011, methodology): “• Color structures for building the color-correlated Born amplitudes were taken from HELAC-Dipoles [16].”
Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report (2014, methodology): “It would be interesting to apply the techniques developed in reference [204] for future applications of the BLHA interface.”