Gavin Cullen
University of Edinburgh
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Featured researches published by Gavin Cullen.
European Physical Journal C | 2014
Gavin Cullen; Hans van Deurzen; Nicolas Greiner; Gudrun Heinrich; Gionata Luisoni; Pierpaolo Mastrolia; Edoardo Mirabella; Giovanni Ossola; Tiziano Peraro; Johannes Schlenk; Johann Felix von Soden-Fraunhofen; Francesco Tramontano
We present the version 2.0 of the program package GoSam for the automated calculation of one-loop amplitudes. GoSam is devised to compute one-loop QCD and/or electroweak corrections to multi-particle processes within and beyond the Standard Model. The new code contains improvements in the generation and in the reduction of the amplitudes, performs better in computing time and numerical accuracy, and has an extended range of applicability. The extended version of the “Binoth-Les-Houches-Accord” interface to Monte Carlo programs is also implemented. We give a detailed description of installation and usage of the code, and illustrate the new features in dedicated examples.
Computer Physics Communications | 2011
Gavin Cullen; J.Ph. Guillet; Gudrun Heinrich; Tobias Kleinschmidt; E. Pilon; Thomas Reiter; M. Rodgers
We present a program for the numerical evaluation of scalar integrals and tensor form factors entering the calculation of one-loop amplitudes which supports the use of complex masses in the loop integrals. The program is built on an earlier version of the golem95 library, which performs the reduction to a certain set of basis integrals using a formalism where inverse Gram determinants can be avoided. It can be used to calculate one-loop amplitudes with arbitrary masses in an algebraic approach as well as in the context of unitarity-inspired numerical reconstruction of the integrand. PACS: 12.38.Bx
Computer Physics Communications | 2014
Simone Alioli; Simon Badger; J. Bellm; Benedikt Biedermann; F. Boudjema; Gavin Cullen; Ansgar Denner; H. van Deurzen; Stefan Dittmaier; Rikkert Frederix; Stefano Frixione; M.V. Garzelli; Stefan Gieseke; E.W.N. Glover; Nicolas Greiner; Gudrun Heinrich; Valentin Hirschi; S. Höche; J. Huston; H. Ita; N. Kauer; Frank Krauss; Gionata Luisoni; D. Maître; Fabio Maltoni; Paolo Nason; Carlo Oleari; R. Pittau; Simon Plätzer; Stefano Pozzorini
We present an update of the Binoth Les Houches Accord (BLHA) to standardise the interface between Monte Carlo programs and codes providing one-loop matrix elements.
Computer Physics Communications | 2011
Gavin Cullen; Maciej Koch-Janusz; Thomas Reiter
In this work, the library spinney is presented, which provides an implementation of helicity spinors and related algorithms for the symbolical manipulation program Form. The package is well suited for symbolic amplitude calculations both in traditional, Feynman diagram based approaches and unitarity-based techniques.
European Physical Journal C | 2013
Gavin Cullen; Nicolas Greiner; Gudrun Heinrich
We present the NLO SUSY-QCD corrections to the production of a pair of the lightest neutralinos plus one jet at the LHC, appearing as a monojet signature in combination with missing energy. We fully include all non-resonant diagrams, i.e. we do not assume that production and decay factorise. We derive a parameter point based on the p19MSSM which is compatible with current experimental bounds and show distributions based on missing transverse energy and jet observables. Our results are produced with the program GoSam Cullen et al. (Eur. Phys. J. C 72:1889, 2012) for automated one-loop calculations in combination with MadDipole/MadGraph for the real radiation part.
arXiv: High Energy Physics - Phenomenology | 2012
Gavin Cullen; Nicolas Greiner; Gudrun Heinrich; Gionata Luisoni; Pierpaolo Mastrolia; Giovanni Ossola; Thomas Reiter; Francesco Tramontano
The program package GoSam is presented which aims at the automated calculation of one-loop amplitudes for multi-particle processes. The amplitudes are generated in terms of Feynman diagrams and can be reduced using either D-dimensional integrand-level decomposition or tensor reduction, or a combination of both. GoSam can be used to calculate one-loop corrections to both QCD and electroweak theory, and model files for theories Beyond the Standard Model can be linked as well. A standard interface to programs calculating real radiation is also included. The flexibility of the program is demonstrated by various examples.
arXiv: High Energy Physics - Phenomenology | 2010
Gavin Cullen; Nicolas Greiner; Alberto Guffanti; Jean-Philippe Guillet; Gudrun Heinrich; Stefan Karg; N. Kauer; Tobias Kleinschmidt; E. Pilon; Thomas Reiter; Juergen Reuter; M. Rodgers; Ioan Wigmore
We report on the current status of the Golem project which aims at the construction of a general one-loop evaluator for matrix elements. We construct the one-loop matrix elements from Feynman diagrams in a highly automated way and provide a library for the reduction and numerically stable evaluation of the tensor integrals involved in this approach. Furthermore, we present applications to physics processes relevant for the LHC.
arXiv: High Energy Physics - Phenomenology | 2010
T. Binoth; Jean-Philippe Guillet; Stefan Karg; Gavin Cullen; N. Kauer; Alberto Guffanti; J. Reuter; Gudrun Heinrich; Thomas Reiter; Nicolas Greiner
In this talk we review the GOLEM approach to one-loop calculations and present an automated implementation of this technique. This method is based on Feynman diagrams and an advanced reduction of one-loop tensor integrals which avoids numerical instabilities. We have extended our one-loop integral library golem95 with an automated one-loop matrix element generator to compute the virtual corrections of the process
arXiv: High Energy Physics - Phenomenology | 2014
Gavin Cullen; H. van Deurzen; Nicolas Greiner; Gudrun Heinrich; Gionata Luisoni; Pierpaolo Mastrolia; Edoardo Mirabella; Giovanni Ossola; Tiziano Peraro; Joscha Reichel; Johannes Schlenk; J. F. von Soden-Fraunhofen; Francesco Tramontano
q\bar{q}\to b\bar{b}b\bar{b}
arXiv: High Energy Physics - Phenomenology | 2014
Gavin Cullen; Edoardo Mirabella; Johannes Schlenk; Joscha Reichel; Gudrun Heinrich; J. F. von Soden-Fraunhofen; Tiziano Peraro; H. van Deurzen; Gionata Luisoni; Giovanni Ossola; Nicolas Greiner; P. Mastrolia; Francesco Tramontano
. The implementation of the virtual matrix element has been interfaced with tree-level Monte Carlo programs to provide the full result for the above process.