A Unified Theory of Matter Genesis: Asymmetric Freeze-In
ArXiv 1010.0245 (2010)
Authors:
Lawrence J Hall, John March-Russell, Stephen M West
Abstract:
We propose a unified theory of dark matter (DM) genesis and baryogenesis. It
explains the observed link between the DM density and the baryon density, and
is fully testable by a combination of collider experiments and precision tests.
Our theory utilises the "thermal freeze-in" mechanism of DM production,
generating particle anti-particle asymmetries in decays from visible to hidden
sectors. Calculable, linked, asymmetries in baryon number and DM number are
produced by the feeble interaction mediating between the two sectors, while the
out-of-equilibrium condition necessary for baryogenesis is provided by the
different temperatures of the visible and hidden sectors. An illustrative model
is presented where the visible sector is the MSSM, with the relevant CP
violation arising from phases in the gaugino and Higgsino masses, and both
asymmetries are generated at temperatures of order 100 GeV. Experimental
signals of this mechanism can be spectacular, including: long-lived metastable
states late decaying at the LHC; apparent baryon-number or lepton-number
violating signatures associated with these highly displaced vertices; EDM
signals correlated with the observed decay lifetimes and within reach of
planned experiments; and a prediction for the mass of the dark matter particle
that is sensitive to the spectrum of the visible sector and the nature of the
electroweak phase transition.
