Ref Arxiv: hep-ph/0608079
Ref. & Cit.: NASA ADS
Résumé:

There are many possibilities for new physics beyond the Standard Model that feature non-standard Higgs sectors. These may introduce new sources of CP violation, and there may be mixing between multiple Higgs bosons or other new scalar bosons. Alternatively, the Higgs may be a composite state, or there may even be no Higgs at all. These non-standard Higgs scenarios have important implications for collider physics as well as for cosmology, and understanding their phenomenology is essential for a full comprehension of electroweak symmetry breaking. This report discusses the most relevant theories which go beyond the Standard Model and its minimal, CP-conserving supersymmetric extension: two-Higgs-doublet models and minimal supersymmetric models with CP violation, supersymmetric models with an extra singlet, models with extra gauge groups or Higgs triplets, Little Higgs models, models in extra dimensions, and models with technicolour or other new strong dynamics. For each of these scenarios, this report presents an introduction to the phenomenology, followed by contributions on more detailed theoretical aspects and studies of possible experimental signatures at the LHC and other colliders.

Commentaires: Report of the CPNSH workshop, May 2004 - Dec 2005, 542 pages. The complete report as well as its individual chapters are also available from http://kraml.home.cern.ch/kraml/cpnsh/report.html

Ref HAL: hal-00020041_v1
Ref Arxiv: hep-ph/0602001
DOI: 10.1088/1126-6708/2006/03/033
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé:

We provide an up-to-date analysis of the parameter space of the minimal supergravity model (mSUGRA). Novel features include the new central value of the top quark mass, an improved calculation of the masses of the supersymmetric particles and the neutral Higgs bosons, constraints from b to s \ell^+ \ell^- decays, and a careful treatment of the most important experimental and theoretical uncertainties. In addition to the by now traditional plots of the allowed region in the (m_0, m_{1/2}) plane, we show allowed regions in the planes spanned by pairs of {\em physical} sparticle or Higgs boson masses. Moreover, we search for the minimal allowed masses of new particles for various sets of constraints. We find that in many cases the direct experimental limits from collider and Dark Matter searches can be saturated even in this minimal model, and even after including the by now quite restrictive constraint on the Dark Matter relic density.

Commentaires: About 35 pages, numerous postscript figures

Ref HAL: hal-00405712_v1
Exporter : BibTex | endNote
Résumé:

We discuss a recent implementation of the two-loop radiative corrections to the Higgs boson masses in three public codes for the calculation of the Minimal Supersymmetric Standard Model. We illustrate the residual theoretical and experimental uncertainties, and phenomenological consequences in representative MSSM scenarios. We discuss, in particular, the resulting most conservative upper bounds on the lighter Higgs boson mass in the general or constrained MSSM upon different assumptions.

Ref HAL: hal-00384091_v1
Exporter : BibTex | endNote
Résumé:

We present an updated analysis of the present constraints on the parameter space of the minimal supergravity model (mSUGRA). New features include, in particular, an improved calculation of the masses of neutral Higgs bosons, constraints from $b \rightarrow s l+ l-$ decays, and updated $g_\mu-2$ constraints. We focus on the minimal allowed masses of sparticles and Higgses from various sets of constraints. We find that the direct experimental limits from collider and Dark Matter searches can still be saturated in many cases within this model, even after the quite restrictive WMAP constraint on the Dark Matter relic density. Consequences for sparticle production at the International Linear Collider in this scenario are briefly discussed.

Ref HAL: in2p3-00025241_v1
Ref Arxiv: hep-ph/0511344
DOI: 10.1140/epjc/s2005-02460-1
WoS: 000241559400003
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
236 Citations
Résumé:

High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when higher-order corrections are included. We propose such a scheme, Supersymmetry Parameter Analysis SPA, based on a consistent set of conventions and input parameters. A repository for computer programs is provided which connect parameters in different schemes and relate the Lagrangian parameters to physical observables at LHC and high energy e+e- linear collider experiments, i.e., masses, mixings, decay widths and production cross sections for supersymmetric particles. In addition, programs for calculating high-precision low energy observables, the density of cold dark matter (CDM) in the universe as well as the cross sections for CDM search experiments are included. The SPA scheme still requires extended efforts on both the theoretical and experimental side before data can be evaluated in the future at the level of the desired precision. We take here an initial step of testing the SPA scheme by applying the techniques involved to a specific supersymmetry reference point.

Commentaires: 17pp; references corrected

Ref HAL: in2p3-00024175_v1
Ref Arxiv: hep-ph/0504090
DOI: 10.1016/j.physletb.2005.08.010
WoS: 000232071300007
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
67 Citations
Résumé:

The requirement that the lightest neutralino $\tilde\chi_1^0$ has the right thermal relic density to explain all Dark Matter in the universe strongly constrains the parameter space of supersymmetric models in general, and of the mSUGRA model in particular. Recently improved calculations of the mass of the light CP-even Higgs boson $h$ present in this model, and the increased central value of the mass of the top quark, have re--opened the possibility that $2 \mlsp \lsim m_h$. In this "$h-$pole region'' the LSP annihilation cross section is enhanced by near-resonant $h$ exchange in the $s-$channel, reducing the relic density to acceptable values. We delineate the corresponding region of mSUGRA parameter space, and explore its phenomenology. In particular, we find strong upper bounds on the masses of the gluino, lighter chargino and LSP.

Commentaires: 16 pages, latex, 4 eps figures; v2: references added

DOI: 10.1142/9789812702227_0277
Résumé:

We discuss a recent implementation of the two-loop radiative corrections to the Higgs boson masses in three public codes for the calculation of the Minimal Supersymmetric Standard Model. We illustrate the residual theoretical and experimental uncertainties, and phenomenological consequences in representative MSSM scenarios. We discuss, in particular, the resulting most conservative upper bounds on the lighter Higgs boson mass in the general or constrained MSSM upon different assumptions.

Commentaires: All proceedings of this conference can be found at http://eproceedings.worldscinet.com/9789812702227/9789812702227.shtml target=_blank > this URL