Procura de Sinais de Dimensões Extras Universais em Colisões Próton-Antipróton

Abstract

Models that predict the existence of extra spatial dimensions have been studied since the beginning of the 20th century. These models can incorporate gravity in the framework that describes the other interactions and they can present a number of interesting features such as a dark matter candidate. In this work, we explore the consequences of the Universal Extra Dimensions (UED) model by searching for the production of Kaluza-Klein particles whose decay chain leads to signature $\mu^{\pm}\mu^{\pm} + \mathrm{jets} + \met$. We employ the data set corresponding to an integrated luminosity of \unit{7.3}{\femto\barn}$^{-1}$, collected by the \dzero{} detector at a $p\bar p$ collider at a center of mass energy of \unit{1.96}{\tera\electronvolt}. Since no excess was observed in the data, we were able to set a lower limit on the compactification scale of $R^{-1}>260$ GeV in the model. This is the first study to impose a direct limit on the minimal UED model.