Automated mass spectrum generation for new physics

Alloul, Adam; D’Hondt, J.; Causmaecker, Karen De; Fuks, Benjamin; Traubenberg, Michel Rausch de

doi:10.1140/epjc/s10052-013-2325-x

Cited by 28 publications

(27 citation statements)

References 54 publications

(113 reference statements)

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“…Masses are typically obtained by going to the mass eigenbasis and, if necessary, by evolving boundary conditions from a large scale down to the EW one. Very general codes exist that perform these operations starting from a FeynRules model, such as AsperGe [89]. The determination of the corresponding widths, on the other hand, requires the explicit calculation of all possible decay channels into lighter (SM or BSM) states.…”

Section: Width Calculatormentioning

confidence: 99%

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

Alwall

Frederix

Frixione

et al. 2014

J. High Energ. Phys.

6,220

5,572

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We discuss the theoretical bases that underpin the automation of the computations of tree-level and next-to-leading order cross sections, of their matching to parton shower simulations, and of the merging of matched samples that differ by light-parton multiplicities. We present a computer program, MadGraph5 aMC@NLO, capable of handling all these computations -parton-level fixed order, shower-matched, merged -in a unified framework whose defining features are flexibility, high level of parallelisation, and human intervention limited to input physics quantities. We demonstrate the potential of the program by presenting selected phenomenological applications relevant to the LHC and to a 1-TeV e + e − collider. While next-to-leading order results are restricted to QCD corrections to SM processes in the first public version, we show that from the user viewpoint no changes have to be expected in the case of corrections due to any given renormalisable Lagrangian, and that the implementation of these are well under way.

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Section: Width Calculatormentioning

confidence: 99%

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

Alwall

Frederix

Frixione

et al. 2014

J. High Energ. Phys.

6,220

5,572

View full text Add to dashboard Cite

show abstract

“…The mass matrices calculated in this way can be further passed to the ASperGe program [43] for a numerical evaluation of the necessary rotations yielding a diagonal mass basis (see Section 6.2). In principle, kinetic mixing among gauge bosons related to different U(1) factors of the gauge group is also possible.…”

Section: Mixing Declarationmentioning

confidence: 99%

“…We refer to Ref. [43] for examples. In order to implement the bases in a more compact form, spin and Lorentz indices can be omitted.…”

Section: Massbasis = Value Gaugebasismentioning

confidence: 99%

“…In particular, it shows how to -define indices of various types, -to perform expansions over 'flavor' indices, -define mixing matrices, -perform the rotation from the gauge eigenstates to the mass eigenstates (without employing the mass diagonalization package for which we refer to Ref. [43]), -add gauge interactions to the model.…”

Section: A Simple Examplementioning

confidence: 99%

“…An automatic mass diagonalization module was created [40,43] allowing FeynRules to extract automatically from any Lagrangian the tree-level mass matrices and to export them through the ASperGe interface for a numerical extraction of the spectrum. In practice, one re-organizes slightly the FeynRules model file and then uses the new built-in functions to extract the mass matrices and generate the ASperGe source code.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

FeynRules 2.0 — A complete toolbox for tree-level phenomenology

Alloul

Christensen

Degrande

et al. 2014

Computer Physics Communications

Self Cite

2,422

1,904

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FeynRules is a Mathematica-based package which addresses the implementation of particle physics models, which are given in the form of a list of fields, parameters and a Lagrangian, into high-energy physics tools. It calculates the underlying Feynman rules and outputs them to a form appropriate for various programs such as CalcHep, FeynArts, MadGraph, Sherpa and Whizard. Since the original version, many new features have been added: support for two-component fermions, spin-3/2 and spin-2 fields, superspace notation and calculations, automatic mass diagonalization, completely general FeynArts output, a new universal FeynRules output interface, a new Whizard interface, automatic 1 → 2 decay width calculation, improved speed and efficiency, new guidelines for validation and a new web-based validation package. With this feature set, FeynRules enables models to go from theory to simulation and comparison with experiment quickly, efficiently and accurately.

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The dark Z′ portal: direct, indirect and collider searches

Alves

Profumo

Queiroz

2014

J. High Energ. Phys.

172

159

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We perform a detailed study of the dark Z portal using a generic parametrization of the Z -quarks couplings, both for light (8−15) GeV and heavy (130−1000) GeV dark matter scenarios. We present a comprehensive study of the collider phenomenology including jet clustering, hadronization, and detector artifacts, which allows us to derive accurate bounds from the search for new resonances in dijet events and from mono-jet events in the LHC 7 TeV, LHC 8 TeV, and Tevatron 1.96 TeV data. We also compute the dark matter relic abundance, the relevant scattering cross sections and pair-annihilation spectrum, and compare our results with the current PLANCK, Fermi-LAT and XENON100/LUX bounds. Lastly, we highlight the importance of complementary searches for dark matter, and outline the excluded versus still viable parameter space regions of the dark Z portal.

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Automated mass spectrum generation for new physics

Cited by 28 publications

References 54 publications

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

FeynRules 2.0 — A complete toolbox for tree-level phenomenology

The dark Z′ portal: direct, indirect and collider searches

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