Twin mechanism for baryon and dark matter asymmetries

Abstract

In the context of Twin Higgs models, we study a simple mechanism that simultaneously generates asymmetries in the dark and visible sector through the out-of-equilibrium decay of a TeV scale particle charged under a combination of baryon and twin baryon number. We predict the dark matter to be a 5 GeV twin baryon, which is easy to achieve because of the similarity between the two confinement scales. Dark matter is metastable and can decay to three quarks, yielding indirect detection signatures. The mechanism requires the introduction of a new colored particle, typically within the reach of the LHC, of which we study the rich collider phenomenology, including prompt and displaced dijets, multi-jets, monojets and monotops.

Cosmological signals of a mirror twin Higgs

“…This raises the prospect of dis-1 For recent related work on the cosmology and cosmological signatures of non-minimal Twin Higgs scenarios, see e.g. [12][13][14][15][16][17][18].…”

“…It would be worthwhile to study models for the baryon asymmetry consistent with these scenarios. Steps in this direction have been taken in [17], which attempted to relate this to asymmetric dark matter in the twin sector.…”

“…Previous work attempting to construct dark matter candidates in the twin sector [11][12][13][14][15][16][17][18]) has relied upon explicit Z 2 -breaking that is not present in the mirror model. Dark matter may alternatively be -42 -…”

Cosmology in Mirror Twin Higgs and neutrino masses

“…A small hard breaking of the Z 2 symmetry in the Yukawa sector, as discussed in [25], offers a minimal approach to address the cosmological problems of the MTH, although here we shall follow a different route. Once the bounds on ∆N eff are satisfied, cosmological puzzles such as the origin of dark matter [26] and the generation of the baryon asymmetry [27] can be addressed. We note that conventional mirror models [28][29][30] are able to avoid the bounds on ∆N eff by simply eliminating the Higgs portal coupling between the two sectors.…”

Supersymmetric D-term Twin Higgs

“…refs. [19][20][21][22][23][24][25]. 3 Suppression of the Higgs mass at small tan β can be avoided if Z2 breaking quartic term is present but this comes at a cost of model simplicity, see e.g.…”