Ref HAL: hal-00288517_v1
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Résumé:

Je parlerai de densité de relique de matière noire dans le modèle supersymétrique non minimal (NMSSM) avec des paramètres semi- universels à l'échelle de grande unification.

Ref HAL: hal-00288516_v1
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I will present the fortran code NMHDECAY which calculates the NMSSM sparticle and Higgs masses and decay widths starting from general (electroweak scale) free parameters, as well as the code NMSPEC which does the same for mSUGRA type (GUT scale) parameters. I will also discuss the link between these programs and the relic density computation program micrOMEGAs.

Ref HAL: hal-00258401_v1
Ref Arxiv: 0801.4321
DOI: 10.1088/1126-6708/2008/07/002
Ref. & Cit.: NASA ADS
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60 citations
Résumé:

We discuss constrained and semi--constrained versions of the next--to--minimal supersymmetric extension of the Standard Model (NMSSM) in which a singlet Higgs superfield is added to the two doublet superfields that are present in the minimal extension (MSSM). This leads to a richer Higgs and neutralino spectrum and allows for many interesting phenomena that are not present in the MSSM. In particular, light Higgs particles are still allowed by current constraints and could appear as decay products of the heavier Higgs states, rendering their search rather difficult at the LHC. We propose benchmark scenarios which address the new phenomenological features, consistent with present constraints from colliders and with the dark matter relic density, and with (semi--)universal soft terms at the GUT scale. We present the corresponding spectra for the Higgs particles, their couplings to gauge bosons and fermions and their most important decay branching ratios. A brief survey of the search strategies for these states at the LHC is given.

Ref HAL: in2p3-00175932_v1
Ref Arxiv: 0707.0628
DOI: 10.1088/1475-7516/2007/11/009
Ref. & Cit.: NASA ADS
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47 citations
Résumé:

We explore the parameter space of the Constrained Next-to-Minimal Supersymmetric Standard Model with GUT scale boundary conditions (CNMSSM) and find regions where the relic density of the lightest neutralino is compatible with the WMAP measurement. We emphasize differences with the MSSM: cases where annihilation of the LSP occurs via a Higgs resonance at low values of tan\beta and cases where the LSP has a large singlino component. The particle spectrum as well as theoretical and collider constraints are calculated with NMSSMTools. All neutralino annihilation and coannihilation processes are then computed with micrOMEGAs, taking into account higher order corrections to the Higgs sector.

Commentaires: 17 pages.

Ref Arxiv: hep-ph/0602198
Ref. & Cit.: NASA ADS
Résumé:

The work contained herein constitutes a report of the "Beyond the StandardModel'' working group for the Workshop "Physics at TeV Colliders", Les Houches,France, 2-20 May, 2005. We present reviews of current topics as well asoriginal research carried out for the workshop. Supersymmetric andnon-supersymmetric models are studied, as well as computational tools designedin order to facilitate their phenomenology.

Commentaires: 269 pages, 165 figures. Web page of the workshop (with links to the talks) http://lappweb.in2p3.fr/conferences/LesHouches/Houches2005/

Ref HAL: hal-00314140_v1
Ref Arxiv: hep-ph/0508022
DOI: 10.1016/j.cpc.2006.04.004
Ref. & Cit.: NASA ADS
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300 citations
Résumé:

We describe the improved properties of the NMHDECAY program, that is designed to compute Higgs and sparticle masses and Higgs decay widths in the NMSSM. In the version 2.0, Higgs decays into squarks and sleptons are included, accompanied by a calculation of the squark, gluino and slepton spectrum and tests against constraints from LEP and the Tevatron. Further radiative corrections are included in the Higgs mass calculation. A link to MicrOMEGAs allows to compute the dark matter relic density, and a rough (lowest order) calculation of BR(b→sγ) is performed. Finally, version 2.1 allows to integrate the RGEs for the soft terms up to the GUT scale.

Commentaires: Supersymmetry; NMSSM; Higgs masses; Sparticle masses

Ref HAL: hal-00123552_v1
Ref Arxiv: hep-ph/0612133
DOI: 10.1142/S0217732307023870
Ref. & Cit.: NASA ADS
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65 citations
Résumé:

We update the upper bound on the lightest CP even Higgs mass in the NMSSM, which is given as a function of tan(beta). For m_top=178 GeV, squark masses of 1 TeV and maximal mixing it is assumed near tan(beta) 2.1 and close to 140 GeV.