LanHEP—a package for the automatic generation of Feynman rules in field theory. Version 3.0

Семенов, А.

doi:10.1016/j.cpc.2008.10.012

Cited by 161 publications

(134 citation statements)

References 13 publications

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“…(i) Bino LSP: In this case, in the MSSM, right-handed squarks with light fermionic partners decay only hadronically as in (22). The resulting 0 lepton þ 1 jet þ E 6 T signal can be unambiguously established at the LHC [16].…”

Section: Uð1þ 0 Effects Through Gauge and Higgs Fermionsmentioning

confidence: 99%

“…We compute the cross sections and branching ratios, and generate parton-level events by using CalcHEP v.2.5 [21]. We modified the package to incorporate the features pertaining to the Uð1Þ 0 model with the help of LanHEP Package [22]. Hadronization (including initial and final state radiations) and restrictions imposed by various cuts have been achieved with PYTHIA [23] by using the CalcHEPÀPYTHIA interface.…”

Section: B the Lhc Signatures Of The Uð1þmentioning

confidence: 99%

“…In either case, the decay mode above has 100% branching fraction as there is no other open decay channel for theq R in the MSSM. In contrast to the MSSM decay mode (22), the righthanded squarks exhibit a completely new decay pattern in the Uð1Þ 0 model. As seen from Table I,q R now decays via two distinct channels,…”

Section: Uð1þ 0 Effects Through Gauge and Higgs Fermionsmentioning

confidence: 99%

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Search for gauge extensions of the MSSM at the LHC

et al. 2009

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The extensions of the minimal supersymmetric model (MSSM), driving mainly from the need to solve the problem, involve novel matter species and gauge groups. These extended MSSM models can be searched for at the LHC via the effects of the gauge and Higgs bosons or their fermionic partners. Traditionally, the focus has been on the study of the extra forces induced by the new gauge and Higgs bosons present in such models. An alternative way of studying such effects is through the superpartners of matter species and the gauge forces. We thus consider a Uð1Þ 0 gauge extension of the MSSM, and perform an extensive study of the signatures of the model through the production and decays of the scalar quarks and gluino, which are expected to be produced copiously at the LHC. After a detailed study of the distinctive features of such models with regard to the signatures at the LHC, we carry out a detailed Monte Carlo analysis of the signals from the process pp ! n leptons þ m jets þ E 6 T , and compare the resulting distributions with those predicted by the MSSM. Our results show that the searches for the extra gauge interactions in the supersymmetric framework can proceed not only through the forces mediated by the gauge and Higgs bosons but also through the superpartner forces mediated by the gauge and Higgs fermions. Analysis of the events induced by the squark/gluino decays presented here is complementary to the direct Z 0 searches at the LHC.

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Section: Uð1þ 0 Effects Through Gauge and Higgs Fermionsmentioning

confidence: 99%

Section: B the Lhc Signatures Of The Uð1þmentioning

confidence: 99%

Section: Uð1þ 0 Effects Through Gauge and Higgs Fermionsmentioning

confidence: 99%

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Search for gauge extensions of the MSSM at the LHC

et al. 2009

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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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“…Fig. 8 shows the tree-level Drell-Yan production cross sections, computed with the program CompHEP 4.4 [12], using a model file generated with the help of the LanHEP package [13].…”

Section: Collider Phenomenologymentioning

confidence: 99%

Signatures of the Minimal Moose Model With Exact Parity

Freitas

Schwaller

Wyler

2010

Nuclear Physics B - Proceedings Supplements

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In the popular littlest Higgs model, T-parity can be broken by Wess-Zumino-Witten (WZW) terms induced by a strongly coupled UV completion. On the other hand, certain models with multiple scalar multiplets (called moose models) permit the implementation of T-parity such that it is not broken by the WZW terms. Here we present a concrete realization of such a model, and discuss the phenomenology at the Large Hadron Collider, in particular differences with respect to the littlest Higgs model. AbstractIn the popular littlest Higgs model, T-parity can be broken by Wess-Zumino-Witten (WZW) terms induced by a strongly coupled UV completion. On the other hand, certain models with multiple scalar multiplets (called moose models) permit the implementation of an exchange symmetry (X-parity) such that it is not broken by the WZW terms. Here we present a concrete and realistic construction of such a model. The little Higgs model with X-Parity is a concrete and realistic implementation of this idea. In this contribution, the properties of the model are reviewed and the collider phenomenology is discussed in some detail. We also present new results on the decay properties and LHC signatures of the light triplet scalars that are predicted by this model.

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LanHEP—a package for the automatic generation of Feynman rules in field theory. Version 3.0

Cited by 161 publications

References 13 publications

Search for gauge extensions of the MSSM at the LHC

Search for gauge extensions of the MSSM at the LHC

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Signatures of the Minimal Moose Model With Exact Parity

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