Untitled

Abstract

One simple modification of existing external fixation equipment has allowed a new halo-pelvic device to be constructed and used effectively to immobilize the spine.

Top quark asymmetry and dijet resonances

“…Alternatively, we consider a non-Abelian model with W ′ − d − t coupling, which has also been considered in hopes of explaining the top asymmetry [35][36][37][38] (see also [39]). By considering both tt and dijet measurements, the parameters of {M W ′ , M Z ′ , α X } = 160 GeV, 80 GeV, 0.086 with a small assumed flavordiagonal coupling induced by CKM-like mixing can produce σ(tt) ℓj = 8.3 pb, σ(tt) ℓℓ = 7.1 pb, A t F B = 0.15 and about 95 dijet excess events.…”

Multicomponent dark matter in supersymmetric hidden sector extensions

“…Recently several particle physics models have been constructed that connect the standard model (SM) to hidden sectors and lead to massive narrow vector boson resonances as well as other signatures which can be detected at colliders [1,2,3]. The connection to the hidden sector arises via mass mixings and kinetic mixings [1,2,3,4,5,6] and via higher dimensional operators.…”

“…The connection to the hidden sector arises via mass mixings and kinetic mixings [1,2,3,4,5,6] and via higher dimensional operators. Models with the above forms of communication between the sectors also have important implications for dark matter [7,3,6] (for a review see [8,9]). In this work we show that multicomponent dark matter can arise from U(1) n extensions of the minimal supersymmetric standard model (MSSM) with Abelian hidden sectors which include hidden sector matter.…”

“…(5) we give an analysis of event rates for the proposed models for CDMS-II and for XENON-100. We give the analysis within the framework of supergravity grand unified models [23,24] defined by the parameters m 0 , m 1/2 , A 0 , tan β, and sign(µ) with nonuniversalities (NUSUGRA) defined by δ 1,2,3 in the gaugino sector so that (3) C gaugino masses at the grand unified theory (GUT) scale are given bym i = m 1/2 (1 + δ i ) (i = 1, 2, 3) (see, e.g., [25] and references therein). We also discuss the possible new physics one might observe at the LHC (for a recent review see also [9]) and elsewhere for these models.…”

Electroweak cogenesis

“…The only way to imbue a neutral DM particle with baryon or lepton number is to couple it to the SM via higher dimension operators. While higher dimension operators are often employed in models of ADM and even certain theories of baryogenesis [7], we forgo them here in search of a fully renormalizable model of ADM. Higgs number is another logical possibility, but electroweak symmetry breaking will induce late time DM oscillations [8] which will instantaneously erase the DM asymmetry unless the associated Higgs couplings are exceedingly weak or non-renormalizable [9,10]. For these reasons, we take U (1) DM to be an additional global symmetry beyond the SM.…”