We present an extension of the program golem95C for the numerical evaluation of scalar integrals and tensor form factors entering the calculation of one-loop amplitudes, which supports tensor ranks ...exceeding the number of propagators. This extension allows various applications in Beyond the Standard Model physics and effective theories, for example higher ranks due to propagators of spin two particles, or due to effective vertices. Complex masses are also supported. The program is not restricted to the Feynman diagrammatic approach, as it also contains routines to interface to unitarity-inspired numerical reconstruction of the integrand at the tensorial level. Therefore, it can serve as a general integral library in automated programs to calculate one-loop amplitudes.
Program title: golem95-1.3.0
Catalogue identifier: AEEO_v3_0
Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEEO_v3_0.html
Program obtainable from: CPC Program Library, Queen’s University, Belfast, N. Ireland
Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html
No. of lines in distributed program, including test data, etc.: 242036
No. of bytes in distributed program, including test data, etc.: 1092837
Distribution format: tar.gz
Programming language: Fortran95.
Computer: any computer with a Fortran95 compiler.
Operating system: Linux, Unix.
RAM: RAM used per integral/form factor is insignificant
Classification: 4.4, 11.1.
External routines: some finite scalar integrals are called from OneLOop 1,2, the option to call them from LoopTools 3,4 is also implemented.
Catalogue identifier of previous version: AEEO_v2_0
Journal reference of previous version: Comput. Phys. Comm. 182(2011)2276
Does the new version supercede the previous version?: yes
Nature of problem:
evaluation of one-loop multi-leg integrals occurring in the calculation of next-to-leading order corrections to scattering amplitudes in particle physics. In the presence of particles with spin two in the loop, or effective vertices, or certain gauges, tensor integrals where the rank exceeds the number of propagators N are required.
Solution method:
extension of the reduction algorithm to rank r≤10 for N≤4 and r≤N+1 for N≥5, which is sufficient for most applications in Beyond the Standard Model Physics.
Reasons for new version:
the previous version was restricted to tensor ranks less than or equal to the number of propagators.
Summary of revisions:
tensor ranks >N are supported, an alternative reduction method for the case of infrared divergent triangles is implemented, numerical stability for the case of small mass differences has been improved.
Running time:
depends on the nature of the problem. A single call to a rank 6 five-point form factor at a randomly chosen kinematic point, using real masses, takes 10−3 s on an Intel Core 4 i7-3770 CPU with a 3.4 GHz processor.
We present the calculation of the NLO QCD corrections to the associated production of a Higgs boson and two jets, in the infinite top-mass limit. We discuss the technical details of the computation ...and we show the numerical impact of the radiative corrections on several observables at the LHC. The results are obtained by using a fully automated framework for fixed order NLO QCD calculations based on the interplay of the packages GoSam and Sherpa. The evaluation of the virtual corrections constitutes an application of the d-dimensional integrand-level reduction to theories with higher dimensional operators. We also present first results for the one-loop matrix elements of the partonic processes with a quark-pair in the final state, which enter the hadronic production of a Higgs boson together with three jets in the infinite top-mass approximation.
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.
We present the version 2.0 of the program package GoSAM, which is a public program package to compute one-loop QCD and or electroweak corrections to multi-particle processes within and beyond the ...Standard Model. The extended version of the Binoth-Les- Houches-Accord interface to Monte Carlo programs is also implemented. This allows a large flexibility regarding the combination of the code with various Monte Carlo programs to produce fully differential NLO results, including the possibility of parton showering and hadronisation. We illustrate the wide range of applicability of the code by showing phenomenological results for multi-particle processes at NLO, both within and beyond the Standard Model.
A
bstract
We calculate the process
pp
→
W
+
W
−
→
e
+
ν
e
μ
−
ν
¯
μ
at NLO QCD, including also effective field theory (EFT) operators mediating the
ggW
+
W
−
interaction, which first occur at ...dimension eight. We further combine the NLO and EFT matrix elements produced by G
o
S
am
with the H
erwig
7/M
atchbox
framework, which offers the possibility to study the impact of a parton shower. We assess the effects of the anomalous couplings by comparing them to top-mass effects as well as uncertainties related to variations of the renormalisation, factorisation and hard shower scales.
We present applications of the program GoSAM for the automated calculation of one-loop amplitudes. Results for NLO QCD corrections to beyond the Standard Model processes as well as Higgs plus up to ...three-jet production in gluon fusion are shown. We also discuss some new features of the program.
We present an extension of the program golem95C for the numerical evaluation of scalar integrals and tensor form factors entering the calculation of one-loop amplitudes, which supports tensor ranks ...exceeding the number of propagators. This extension allows various applications in Beyond the Standard Model physics and effective theories, for example higher ranks due to propagators of spin two particles, or due to effective vertices. Complex masses are also supported. The program is not restricted to the Feynman diagrammatic approach, as it also contains routines to interface to unitarity-inspired numerical reconstruction of the integrand at the tensorial level. Therefore it can serve as a general integral library in automated programs to calculate one-loop amplitudes.
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.
We present the version 2.0 of the program GoSam, which is a public program package to compute one-loop corrections to multi-particle processes. The extended version of the "Binoth-Les-Houches-Accord" ...interface to Monte Carlo programs is also implemented. This allows a large flexibility regarding the combination of the code with various Monte Carlo programs to produce fully differential NLO results, including the possibility of parton showering and hadronisation. We describe the new features of the code and illustrate the wide range of applicability for multi-particle processes at NLO, both within and beyond the Standard Model.
We elaborate on GoSam, a code-writer for automated one-loop calculations. After recalling its main features, we present a selection of phenomenological results recently obtained, giving relevance at ...the evaluation of NLO QCD corrections to the production of a Higgs boson in association with jets and heavy quarks.
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