118432750
A non standard supersymmetric spectrum
Taking a bottom-up point of view and focussing on the lack of signals so far in the Higgs and in the flavour sectors, we argue in favour of giving consideration to supersymmetric extensions of the Standard Model where the lightest Higgs boson has a mass between 200 and 300 GeV and the first two generations of s-fermions are above 20TeV. After examining the simplest extensions of the Minimal Supersymmetric Standard Model that allow this in a natural way, we summarize the main consequences of this pattern of masses at the LHC and we analyze the consequences of a heavier than normal Higgs boson for Dark Matter.
122546935
Supersymmetry, R-parity breaking and the neutrino magnetic moment
Abstract We show that supersymmetric theories with R -parity breaking naturally give rise to significant neutrino magnetic moments. In the minimal supersymmetric standard model the transition magnetic moment μ ν e ν μ can be as large as 10 −13 μ B ( μ B is the Bohr magneton). By requiring an SU (2) H horizontal symmetry of the lagrangian in the Yukawa-less limit, μ ν e ν μ may be one order magnitude larger. In this case the main naturalness constraint on the maximum μ ν e ν μ attainable is the electron mass value rather than the bound on the neutrino mass itself.
11346163
What is the limit on the Higgs mass
Abstract We obtain the bounds on all the gauge invariant, flavour symmetric, CP-even operators of dimension 6 that can affect the electroweak precision tests. For the preferred Higgs mass of about 100 GeV , their minimal scales range from 2 to 10 TeV. Depending on the individual operator, these limits are often significantly stronger than those quoted in the literature, when they exist at all. The impact, if any, of these bounds on the upper limit con the Higgs mass itself is discussed.
118381299
Composite vectors at the Large Hadron Collider
An unspecified strong dynamics may give rise to composite vectors sufficiently light that their interactions, among themselves or with the electroweak gauge bosons, be approximately described by an effective Lagrangian invariant under SU(2)L × SU(2)R/SU(2)L+R. We study the production at the LHC of two such states by vector boson fusion or by the Drell-Yan process in this general framework and we compare it with the case of gauge vectors from a SU(2)L × SU(2)R × SU(2)N gauge model spontaneously broken to the diagonal SU(2) subgroup by a generic σ-model. Special attention is payed to the asymptotic behaviour of the different amplitudes in both cases. The expected rates of multi-lepton events from the decay of the composite vectors are also given. A thorough phenomenological analysis and the evaluation of the backgrounds to such signals, aiming at assessing the visibility of composite-vector pairs at the LHC, is instead deferred to future work.
27801366
Grand unification and the supersymmetric threshold.
It is shown that grand unification of the minimal supersymmetric standard model does not lead to a prediction for the scale of the superpartner masses, even if the inputs {alpha}, sin{sup 2}{theta}, and {alpha}{sub {ital s}} are known exactly.
16779631
Electric dipole moments as signals of supersymmetric unification
Abstract If supersymmetric unification is true, we show how the combined effort of several experiments under way to try to measure an electric dipole moment of the electron or of the neutron has a significant chance not only of producing a positive signal but also of providing crucial information to understand the physical origin of the signal itself.
218730825
Measurement of pseudorapidity distributions of charged particles in proton–proton collisions at √s = 8 TeV by the CMS and TOTEM experiments