125992217
Higgs Boson Beyond the SM (Alternate EW Breaking Scenarios): Nonstandard Higgs Decays
119378973
Quantum modified mooses
Abstract We summarize our findings on the quantum moduli constraints and superpotentials of an infinite family of moose extensions of nf=nc SUSY QCD. For nc=2, we perform concrete calculations using traditional integrating out techniques as well as Intriligator's “integrating in” technique. Checking the constraints and superpotentials in the limits of setting Λ's to zero or integrating out mass terms, we find that the quantum moduli constraints are local in theory space and are equivalent to a consistent structure of “splitting relations” amongst the different theories. Extending the results to arbitrary nc, we show that the splitting relations, along with a set of rules for flowing from a high energy theory to a low energy theory, incorporate much of the physics of the moose chain. The relations can be used both to simplify perturbative calculations of symmetry breaking and to incorporate nonperturbative effects.
122856053
Neutrino alternatives for missing energy events at colliders
If the dark matter consists of a weakly interacting massive particle, it can be produced and studied at future collider experiments like those at the LHC. The production of collider-stable weakly interacting massive particles is characterized by hard scattering events with large missing transverse energy. Here we emphasize and discuss the fact that the discovery of events inconsistent with the standard model with large missing transverse energy need not point to the existence of new, collider-stable particles. We explore an alternative explanation where the only sources of missing transverse energy are standard model neutrinos. We present concrete examples of such scenarios, focusing on supersymmetric models with R-parity violation. We also discuss means of differentiating neutrino missing energy signals from the production of new collider-stable particles. These include both model-dependent signals, such as particle tags and flavor counts, as well as model-independent tests that attempt to measure the missing particle mass.
119203377
CoGeNT Interpretations
Recently, the CoGeNT experiment has reported events in excess of expected background. We analyze dark matter scenarios which can potentially explain this signal. Under the standard case of spin independent scattering with equal couplings to protons and neutrons, we find significant tensions with existing constraints. Consistency with these limits is possible if a large fraction of the putative signal events is coming from an additional source of experimental background. In this case, dark matter recoils cannot be said to explain the excess, but are consistent with it. We also investigate modifications to dark matter scattering that can evade the null experiments. In particular, we explore generalized spin independent couplings to protons and neutrons, spin dependent couplings, momentum dependent scattering, and inelastic interactions. We find that some of these generalizations can explain most of the CoGeNT events without violation of other constraints. Generalized couplings with some momentum dependence, allows further consistency with the DAMA modulation signal, realizing a scenario where both CoGeNT and DAMA signals are coming from dark matter. A model with dark matter interacting and annihilating into a new light boson can realize most of the scenarios considered. ar X iv :1 00 4. 06 97 v2 [ he pph ] 1 0 A ug 2 01 0
14393339
The New Fat Higgs: Slimmer and More Attractive
In this paper we increase the MSSM tree level higgs mass bound to a value that is naturally larger than the LEP-II search constraint by adding to the superpotential a λSH u H d term, as in the NMSSM, and UV completing with new strong dynamics before λ becomes non-perturbative. Unlike other models of this type the higgs fields remain elementary, alleviating the supersym-metric fine-tuning problem while maintaining unification in a natural way.
14269455
A Supersymmetric Twin Higgs
We present a supersymmetric realization of the twin Higgs mechanism, which cancels off all contributions to the Higgs mass generated above a scale f. Radiative corrections induced by the top quark sector lead to a breaking of the twin sector electroweak symmetry at a scale f ∼ TeV. In our sector, below the scale f , these radiative corrections from the top quark are present but greatly weakened, naturally allowing a Z boson mass an order of magnitude below f , even with a top squark mass of order 1 TeV and a messenger scale near the Planck mass. A sufficient quartic interaction for our Higgs boson arises from the usual gauge contribution together with a radiative contribution from a heavy top squark. The mechanism requires the presence of an SU (2)-adjoint superfield, and can be simply unified. Naturalness in these theories is usually associated with light winos and sleptons, and is largely independent of the scale of the colored particles. The assumption of unification naturally predicts the existence of many exotic fields. The theory often has particles which may be stable on collider timescales, including an additional color octet superfield. In the limit that m SU SY ≫ f , the mechanism yields a UV completion of the non-supersymmetric twin Higgs, and with the notable improvement of a tree-level quartic for the standard model Higgs. In this framework, a successful UV completion requires the existence of new charged fields well below the scale f .
118806664
Search for the Top Quark in the $e +$ Jets with $\mu^-$ Tag Channel at D0