Grégory Moreau

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It is notorious that, contrary to all other precision electroweak data, the forward– backward asymmetry for b quarks A b F B measured in Z decays at LEP1 is nearly three standard deviations away from the predicted value in the Standard Model; significant deviations also occur in measurements of the asymmetry off the Z pole. We show that these discrepancies(More)
We consider the Randall-Sundrum extra dimensional model with fields propagating in the bulk based on an extended electroweak gauge symmetry with specific fermion charges and localizations that allow to explain the LEP anomaly of the forward– backward asymmetry for b–quarks, A b F B. We study the manifestations of the strongly– interacting and electroweak(More)
We analyze the Minimal Supersymmetric extension of the Standard Model that we have after the discovery of the Higgs boson at the LHC, the hMSSM (habemus MSSM?), i.e. a model in which the lighter h boson has a mass of approximately 125 GeV which, together with the non-observation of superparticles at the LHC, indicates that the SUSY-breaking scale M S is(More)
We study the single chargino production e + e − → ˜ χ ± µ ∓ at linear colliders which occurs through the λ121 R-parity violating coupling constant. We focus on the final state containing 4 leptons and some missing energy. The largest background is supersymmetric and can be reduced using the initial beam polarization and some cuts based on the specific(More)
In the Minimal Supersymmetric Standard Model with bilinear R-parity violation, only one neutrino eigenstate acquires a mass at tree level, consequently experimental data on neutrinos cannot be accommodated at tree level. We show that in the Next-to-Minimal extension, where a gauge singlet superfield is added to primarily address the so-called µ-problem, it(More)
Amongst the diverse propositions for extra dimensional scenarios, the model of Randall and Sundrum (RS), which offers a solution for the long standing puzzle of the gauge hierarchy problem, has attracted considerable attention from both the theoretical and experimental points of view. In the context of the RS model with gauge bosons and fermions living in(More)
Vector-like quarks (VLQ) that are partners of the heavy top and bottom quarks are predicted in many extensions of the standard model (SM). We explore the possibility that these states could explain not only the long-standing anomaly in the forward–backward asymmetry in b-quark production at LEP, A b FB , but also the more recent ∼2σ deviation of the cross(More)
In the context of a simple five-dimensional (5D) model with bulk matter coupled to a brane-localized Higgs boson, we point out a non-commutativity in the 4D calculation of the mass spectrum for excited fermion towers: the obtained expression depends on the choice in ordering the limits, N → ∞ (infinite Kaluza–Klein tower) and → 0 (being the parameter(More)