UFO – The Universal FeynRules Output

Degrande, Céline; Duhr, Claude; Fuks, Benjamin; Grellscheid, David; Mattelaer, Olivier; Reiter, Thomas

doi:10.1016/j.cpc.2012.01.022

Cited by 1,284 publications

(1,140 citation statements)

References 81 publications

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“…We added the shift due to the operators in the hgg and hγγ effective vertices using Feynrules [149] into an UFO model [150] of MadGraph5 [151]. We generated samples at 7 TeV with a parton level cut on |η γ | < 3.5 and p T,γ > 20 GeV.…”

Section: Jhep12(2012)077mentioning

confidence: 99%

NSUSY fits

Espinosa

Grojean

Sanz

et al. 2012

J. High Energ. Phys.

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We perform a global fit to Higgs signal-strength data in the context of light stops in Natural SUSY. In this case, the Wilson coefficients of the higher dimensional operators mediating g g → h and h → γ γ, given by c g , c γ , are related by c g = 3 (1 + 3 α s /(2 π))c γ /8. We examine this predictive scenario in detail, combining Higgs signalstrength constraints with recent precision measurements of m W , Br(B → X s γ) constraints and direct collider bounds on weak scale SUSY, finding regions of parameter space that are consistent with all of these constraints. However it is challenging for the allowed parameter space to reproduce the observed Higgs mass value with sub-TeV stops. We discuss some of the direct stop discovery prospects and show how Higgs search data can be used to exclude light stop parameter space difficult to probe by direct collider searches. We determine the current status of such indirect exclusions and estimate their reach by the end of the 8 TeV LHC run.

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Section: Jhep12(2012)077mentioning

confidence: 99%

NSUSY fits

Espinosa

Grojean

Sanz

et al. 2012

J. High Energ. Phys.

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“…The cross sections and branching ratios have been calculated with the help of the package FeynRules (version 1.6.0) [50,51], thus creating a new model file in CompHEP (version 2.5.4) [52]. CTEQ6L parton distribution functions have been used, with the renormalisation and factorisation scales set at the doubly-charged scalar mass.…”

Section: Benchmark Points and Doubly-charged Scalar Decaysmentioning

confidence: 99%

Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets

Chaudhuri

Grimus

Mukhopadhyaya

2014

J. High Energ. Phys.

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The type II seesaw mechanism for neutrino mass generation usually makes use of one complex scalar triplet. The collider signature of the doubly-charged scalar, the most striking feature of this scenario, consists mostly in decays into same-sign dileptons or same-sign W boson pairs. However, certain scenarios of neutrino mass generation, such as those imposing texture zeros by a symmetry mechanism, require at least two triplets in order to be consistent with the type II seesaw mechanism. We develop a model with two such complex triplets and show that, in such a case, mixing between the triplets can cause the heavier doubly-charged scalar mass eigenstate to decay into a singly-charged scalar and a W boson of the same sign. Considering a large number of benchmark points with different orders of magnitude of the ∆L = 2 Yukawa couplings, chosen in agreement with the observed neutrino mass and mixing pattern, we demonstrate that H ++ 1 → H + 2 W + can have more than 99% branching fraction in the cases where the vacuum expectation values of the triplets are small. It is also shown that the above decay allows one to differentiate a two-triplet case at the LHC, through the ratios of events in various multi-lepton channels.

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“…FeynRules [51] (with UFO output [52] for the higher dimensional operators) and in CalcHEP [53] using LanHEP package [54] with the help of auxiliary fields.…”

Section: Anomalous Higgs Couplings and Partial Unitarisationmentioning

confidence: 99%

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Thomas¹

2016

Springer Theses

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In this thesis I study the collider phenomenology of BSM physics at the LHC, concentrating on the Higgs boson and supersymmetery. The implications and effects on cross sections of the loss of unitarity in scattering processes involving multiple vector bosons and/or the Higgs, when the Higgs couplings to the W and the Z are non-SM, is studied using an effective Lagrangian. Subsequently methods to remove unwanted background from transversely polarised vector bosons are explored, which enable an estimation of the potential to measure the Higgs couplings to weak bosons in a model-independent way via vector boson fusion. MSSM effects on Higgs production and decay are also considered, concentrating on the effects due to light stops, sbottoms and staus. Amongst other things, we find that light 3 rd generation squarks generally produce asymmetrical alteration in signal strengths of different production channels, generally causing µ V BF µ ggF > 1. Finally we extend some ATLAS analyses in the low ∆m = mt − mχ0 1 region, extending the excluded masses of light stops. This enables us to limit the maximum effects of light stops on the Higgs, and further limits the parameter space where the light stop scenario of electroweak baryogenesis is viable.

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UFO – The Universal FeynRules Output

Cited by 1,284 publications

References 81 publications

NSUSY fits

NSUSY fits

Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

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