Dark Matter and the elusive Z′ in a dynamical Inverse Seesaw scenario

• Published in: The journal of high energy physics 2017-10, Vol.2017 (10), p.1-21, Article 169
• Main Authors: De Romeri, Valentina, Fernandez-Martinez, Enrique, Gehrlein, Julia, Machado, Pedro A. N., Niro, Viviana
• Format: Article
• Language: English
• Subjects: Beyond Standard Model; Classical and Quantum Gravitation; Elementary Particles; Neutrino Physics; Physics; Physics and Astronomy; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Theoretical Physics; Relativity Theory; String Theory
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP10(2017)169

A bstract The Inverse Seesaw naturally explains the smallness of neutrino masses via an approximate B − L symmetry broken only by a correspondingly small parameter. In this work the possible dynamical generation of the Inverse Seesaw neutrino mass mechanism from the spontaneous breaking of a gauged U(1) B − L symmetry is investigated. Interestingly, the Inverse Seesaw pattern requires a chiral content such that anomaly cancellation predicts the existence of extra fermions belonging to a dark sector with large, non-trivial, charges under the U(1) B − L . We investigate the phenomenology associated to these new states and find that one of them is a viable dark matter candidate with mass around the TeV scale, whose interaction with the Standard Model is mediated by the Z ′ boson associated to the gauged U(1) B − L symmetry. Given the large charges required for anomaly cancellation in the dark sector, the B − LZ ′ interacts preferentially with this dark sector rather than with the Standard Model. This suppresses the rate at direct detection searches and thus alleviates the constraints on Z ′-mediated dark matter relic abundance. The collider phenomenology of this elusive Z ′ is also discussed.