Ref HAL: hal-00327555_v1
DOI: 10.1016/j.nuclphysbps.2005.08.001
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Preface

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

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Cosmic dark matter may be in form of superweakly interacting elementary particles such as the gravitino or the axino. Direkt dark matter searches are not capable of discovering such dark matter. However, gravitinos and axinos are often produced as warm dark matter leaving a signature and the primordial power spectrum. Moreover, their production often entails a perturbation of the epoch of Big Bang nucleosynthesis, thus leaving a signature in the light element abundances. In this talk both of these potential signatures are discussed.

Ref HAL: in2p3-00114511_v1
Ref Arxiv: hep-ex/0609051
DOI: 10.1140/epjc/s10052-006-0156-8
Ref. & Cit.: NASA ADS
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49 citations
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Cross sections, angular distributions and forward-backward asymmetries are presented, of two-fermion events produced in e+e- collisions at centre-of-mass energies from 189 to 209 GeV at LEP, measured with the ALEPH detector. Results for e+e-, mu+mu-, tau+tau-, qq, bb and cc production are in agreement with the Standard Model predictions. Constraints are set on scenarios of new physics such as four-fermion contact interactions, leptoquarks, Z' bosons, TeV-scale quantum gravity and R-parity violating squarks and sneutrinos.

Commentaires: to be published in The European Physical Journal C - ALEPH

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Ref Arxiv: hep-ph/0612133
DOI: 10.1142/S0217732307023870
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65 citations
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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.

Ref HAL: hal-00123548_v1
Ref Arxiv: hep-ph/0612134
DOI: 10.1016/j.cpc.2007.05.001
Ref. & Cit.: NASA ADS
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146 citations
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NMSPEC is a Fortran code that computes the sparticle and Higgs masses, as well as Higgs decay widths and couplings in the NMSSM, with soft SUSY breaking terms specified at MGUT. Exceptions are the soft singlet mass m_s^2 and the singlet self coupling kappa, that are both determined in terms of the other parameters through the minimization equations of the Higgs potential. We present a first analysis of the NMSSM parameter space with universal SUSY breaking terms at MGUT -- except for m_s and A_kappa -- that passes present experimental constraints on sparticle and Higgs masses. We discuss in some detail a region in parameter space where a SM-like Higgs boson decays dominantly into two CP odd singlet-like Higgs states.

Ref HAL: in2p3-00090207_v1
Ref Arxiv: hep-ph/0608297
DOI: 10.1103/PhysRevD.75.014005
Ref. & Cit.: NASA ADS
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167 citations
Résumé:

We use QCD spectral sum rules to test the nature of the meson X(3872), assumed to be an exotic four-quark (c\bar{c}q\bar{q}) state with J^{PC}=1^{++}. For definiteness, we work with the current proposed recently by Maiani et al [1], at leading order in \alpha_s, consider the contributions of higher dimension condensates and keep terms which are linear in the light quark mass m_q. We find M_X=(3925+- 127) MeV which is compatible, within the errors, with he experimental candidate X(3872), while the SU(3) breaking-terms lead to an unusual mass-splitting M_{X^{s}}-M_X=- (61+-30) MeV. The mass-difference between the neutral states due to isospin violation of about 2 MeV is much smaller than the value 8 MeV proposed in [1]. For the b-quark, we predict M_{X_b}= (10144+-106) MeV for the X_b(b\bar{b}q \bar{q}), which is much below the {\bar B}B* threshold in contrast to the {\bar B}B* molecule prediction [2], and for the X_b^s(b\bar{b}s \bar{s}), a mass-splitting M_{X^s_{b}}-M_{X_b}=-(121+-182) MeV. Our analysis also indicates that the mass-splitting between the ground state and the radial excitation of about (225~250) MeV is much smaller than in the case of ordinary mesons and is (within the errors) flavour-independent. We also extract the decay constants, analogous to f_\pi, of such mesons, which are useful for further studies of their leptonic and hadronic decay widths. The uncertainties of our estimates are mainly due to the ones from the c and b quark masses.

Commentaires: 14 pages, 9 figures