A dark vector resonance at CLIC *

Abstract

One of the main problems in Particle Physics is to understand the origin and nature of Dark Matter. An exciting possibility is to consider that the Dark Matter belongs to a new complex but hidden sector. In this paper, we assume the existence of a strongly interacting dark sector consisting on a new scalar doublet and new vector resonances, in concordance with a model recently proposed by our group. 4 Since in a previous work it was found that it is very challenging to find the new vector resonances at the LHC, here we study the possibility of finding them at the a future Compact Linear Collider (CLIC) running at √ s = 3 TeV. We consider two distinct scenarios: when the non-standard scalars are heavy, the dark resonance is intense enough to make its discovery possible at CLIC when the resonance mass is in the range [2000, 3000] GeV. In the second scenario, when the non-standard scalars are light, the new vector boson is too broad to be recognized as a resonance and is not detectable except when the mass of the scalars is close to (but smaller than) a half of the resonance mass and the scale of the dark sector is high. In all the positive cases, less than a tenth of the maximum integrated luminosity is needed to reach the discovery level. Finally, we also comment about the mono-Z

Dimension and Dimensional Reduction in Quantum Gravity

“…In most of physics the dimension of space, or spacetime, is taken as a fixed external parameter. While the notion of dimension is ancient-see [3][4][5] for discussion of the history and philosophythe mathematical formalism for a space of arbitrary dimension is fairly recent, often attributed to Schäfli's work in the early 1850s [6]. The question of why our universe should have the number of dimensions it does was famously discussed in 1917 by Ehrenfest [7], who pointed out that such features as the stability of Newtonian orbits and the duality between electric and magnetic fields are unique to three spatial dimensions.…”