Abstract
In the context of a simplified leptophilic Dark Matter (DM) scenario where the mediator is a new charged fermion carrying leptonic quantum number and the DM candidate is either scalar or vector, the complementarity of different bounds is analysed. In this framework, the extra lepton and DM are odd under a $\mathbb Z_2$ symmetry, hence the leptonic mediator can only interact with the DM state and Standard Model (SM) leptons of various flavours. We show that there is the possibility to characterise the DM spin (scalar or vector), as well as the nature of the mediator, through a combined analysis of cosmological, flavour and collider data. We present an explicit numerical analysis for a set of benchmarks points of the viable parameter space of our scenario.
Highlights
Among the open problems in physics, understanding the origin of dark matter (DM) has one of the highest priorities
We are not assuming here that the heavy lepton can decay into states other than DM and Standard Model (SM) leptons: as we are in the context of a simplified model, the width of the heavy lepton is computed through the masses and couplings of the Lagrangians in Eq (1) or (2) and we have considered a coupling value which is small enough for the Vector-like XL (VLL) to be in the NW approximation (NWA) regime whether it decays to scalar or vector DM
In the attempt to extract information on the properties of DM, and/or a new mediator to its creation, we have put forward here a scenario where the former is a boson, of spin 0 or 1, and the latter a vector-like fermion, of spin 1=2, carrying lepton number, each being an odd eigenstate of a discrete Z2 symmetry which distinguishes SM particles from these two new states, thereby providing the means to render such a DM candidate stable and the mediator to decay exclusively to it
Summary
Among the open problems in physics, understanding the origin of dark matter (DM) has one of the highest priorities. If the mediator is not a SM particle, a further subdivision can be done by considering models where the mediator is even or odd under the same discrete Z2 symmetry This analysis focuses on how applying complementary constraints from different observables from cosmology, flavor and collider physics can help in the characterization of the spin of DM within a specific class of simplified scenarios. We will discuss the constraints on the new parameters of this scenario (masses and couplings) and combine them to identify exclusion/detection regions for some representative benchmarks points (BPs) characterized by how the extra lepton (XL) interacts with the SM ones Once this is done, we shall proceed to the aforementioned characterization of the DM spin, by concentrating on the parameter space surviving both space and ground experiments, as we shall detail below.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
