title: Probing hidden sectors with Stückelberg U(1) gauge fields.
abstract: We propose a framework in which visible matter interacts with matter from a hidden sector through mass mixings of Stückelberg U(1) gauge fields. In contrast to other Z(') mediation scenarios, our setup has the added appealing features that (i) the choice of Z(')'s can be significantly broadened without necessarily introducing unwanted exotic matter and (ii) there can be sizable tree-level interactions between the visible and hidden sectors. String theory embeddings of this scenario and their phenomenological features are briefly discussed.
authors.affiliation: Center for Fundamental Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Hong Kong and Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), 80805 München, Germany.
authors.forename: Wan-Zhe
authors.initials: WZ
authors.lastname: Feng
authors.affiliation: Center for Fundamental Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Hong Kong and Department of Physics, 1150 University Avenue, University of Wisconsin, Madison, Wisconsin 53706, USA.
authors.forename: Gary
authors.initials: G
authors.lastname: Shiu
authors.affiliation: Center for Fundamental Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Hong Kong and Department of Physics, 1150 University Avenue, University of Wisconsin, Madison, Wisconsin 53706, USA.
authors.forename: Pablo
authors.initials: P
authors.lastname: Soler
authors.affiliation: Center for Fundamental Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Hong Kong and Department of Physics, 1150 University Avenue, University of Wisconsin, Madison, Wisconsin 53706, USA.
authors.forename: Fang
authors.initials: F
authors.lastname: Ye