== Anomaly Free Z prime Model

=== Autors

* Martin Bauer
  * Durham University
  * martin.m.bauer@...

* Sascha Diefenbacher
  * Universität Hamburg
  * sascha.daniel.diefenbacher@...

* Tilman Plehn
  * Universität Heidelberg
  * plehn@...

* Michael Russell


* Daniel A. Camargo

=== Model Description

We consider consistent dark matter models with a spin-1 mediator Z' and a dark matter
fermion χ, charged under the new gauge group. The available options are purely singlet
SM fermions, gauged lepton number differences, or the well-known anomaly-free difference
between the lepton and baryon numbers 

{{{#!latex
$\mbox{Var}[\tau(X_p,X_d)]=\mbox{Var}[E(\tau(X_p,X_d)|X_p)]+E[\mbox{Var}(\tau(X_p,X_d)|X_p)]$
}}}