Neutrinos in large extra dimensions and short-baseline nu(e) appearance

Abstract

Fermi Research Alliance, LLC ; U.S. Department of Energy, Office of Science, Office of High Energy Physics ; U.S. Department of Energy ; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) ; Fermilab theory group ; Hong Kong Ph.D. Fellowship Scheme (HKPFS) ; Hong Kong University of Science and Technology ; European Union's Horizon Research and Innovation Programme under Marie Sklodowska-Curie Grant ; National Science Foundation ; Fermi Research Alliance, LLC: DE-AC02-07CH11359 ; U.S. Department of Energy: DE-FG02-13ER41958 ; U.S. Department of Energy: DE-AC02-06CH11357 ; Processo FAPESP: 2012/21627-9 ; European Union's Horizon Research and Innovation Programme under Marie Sklodowska-Curie Grant: 674896 ; European Union's Horizon Research and Innovation Programme under Marie Sklodowska-Curie Grant: 690575 ; National Science Foundation: PHY-1607611 ; We show that, in the presence of bulk masses, sterile neutrinos propagating in large extra dimensions (LED) can induce electron-neutrino appearance effects. This is in contrast to what happens in the standard LED scenario, and hence LED models with explicit bulk masses have the potential to address the MiniBooNE and LSND appearance results as well as the reactor and Gallium anomalies. A special feature in our scenario is that the mixing of the first Kaluza-Klein modes to active neutrinos can be suppressed, making the contribution of heavier sterile neutrinos to oscillations relatively more important. We study the implications of this neutrino mass generation mechanism for current and future neutrino oscillation experiments and show that the Short Baseline Neutrino Program at Fermilab will be able to efficiently probe such a scenario. In addition, this framework leads to massive Dirac neutrinos and thus precludes any signal in neutrinoless double beta decay experiments.