Busca por matéria escura: uma análise fenomenológica, do Planck ao LHC

Abstract

In this thesis we will analyze the problem of Dark Matter (DM) from the Particle Physics point of view proposing and scrutinizing interaction models for a new weakly interacting massive particle (WIMP) considering it as the hole matter content of the dark sector of the Universe. We analyze two possibilities, in a first contribution, we discuss the phenomenology of a Majorana fermion as a dark matter candidate interacting only through the anapole moment, in other words, the mediator is the photon considering an effective Lagrangian, add that we apply a simplified models as well where the anapole moment is generated by loop level due to electric charged scalar. As our main contribution, we examine the possibility of the dark matter be produced and detected in the LHC using artificial intelligence algorithms. We perform a comparison between our results and the prospects of one of the most powerful next-generation experiment which considers the direct detection approaches showing the most effective values for the parameter space that favors collider detection. In a second moment, we studied the lepton flavor violation induced by dark matter. We focus our analysis considering the gauge extension of the standard model SU(3)c SU(3)L U(1)N so-called 3-3-1 with right-handed neutrinos. We will show that the new neutral vector gauge boson (namely Z0) gives the major contribution to both the relic abundance, its production in the early Universe, and a possible direct detection interaction for the dark matter in this model. In addition, we will shown that future experiments looking for LFV (VOENA, 2017; RENGA, 2018), in the decay process μ -> ey, will provide extremely relevant complementary links to DM, being able to probe much of the model’s parameter space (for the DM physics).