Electroweak cogenesis

Abstract

We propose a simple renormalizable model of baryogenesis and asymmetric dark matter generation at the electroweak phase transition. Our setup utilizes the two Higgs doublet model plus two complex gauge singlets, the lighter of which is stable dark matter. The dark matter is charged under a global symmetry that is broken in the early universe but restored during the electroweak phase transition. Because the ratio of baryon and dark matter asymmetries is controlled by model parameters, the dark matter need not be light. Thus, new force carriers are unnecessary and the symmetric dark matter abundance can be eliminated via Higgs portal interactions alone. Our model places a rough upper bound on the dark matter mass, and has implications for direct detection experiments and particle colliders.

CP -violating phenomenology of flavor conserving two Higgs doublet models

“…We fix the other parameters to be m H þ ¼ 420 GeV, m h 2 ¼ 400 GeV, m h 3 ¼ 450 GeV, ν ¼ 1.0, and α ¼ β − π=2. 5,6,7 We find the dominant contributions are always from hγγ or Hγγ (H ¼ h 2 , h 3 ) diagrams at low or high tan β regimes, respectively. Around tan β ≈ 10-20, they have comparable magnitudes and opposite signs, leading to a cancellation in the total d e .…”

“…General expressions for oblique parameters in 2HDM were given by Grimus et al [38]. 6 The charged Higgs mass is chosen to be > 380 GeV in order to satisfy B → X s γ bounds [39]. 7 We note that the reported 3.4σ deviation of the rate forB → D ðÃÞ τ −ν τ [40] from the SM prediction cannot be accommodated by the 2HDM scenario analyzed here.…”

“…It is well known that BSM CP violation is required to account for the observed excess of matter over antimatter in the present Universe. If realized in nature, the 2HDM may provide the necessary CP violation and may enable the generation of the matterantimatter asymmetry during the era of EWSB [3][4][5], and possibly the co-generation of both baryonic and dark matter in the Universe [6]. If so, then the 2HDM CP violation may have observable signatures in laboratory tests.…”

Gravitational Waves, baryon asymmetry of the universe and electric dipole moment in the CP-violating NMSSM

“…This generally translates into the widely adopted criteria φ EW (T C )/T C 1 [44][45][46] where φ EW ≡ ϕ 2 u +ϕ 2 d 1) . Due to the addition of the extra scalar singlet and the inclusion of CPV in the Higgs potential, the field space is of relatively high dimension and thus the phase transition history can be of quite rich structures [19] and typically have a two step EWPT [25,[48][49][50][51][52][53][54][55][56] 2) . Due to the relatively large parameter space of this model, we seek here only representative benchmark points to illustrate the phase structures while a more comprehensive analysis of the model parameter space is deferred to future works.…”

Electroweak Baryogenesis from Dark-Sector CP Violation

“…Within the bubble wall, the Higgs VEV turns on, while the S VEV simultaneously turns off. Such a transition to the electroweak broken phase has been studied and involves a two-step process from the original vacuum with S = H = 0 [36,[39][40][41][42]. The necessary ingredient to allow for a strongly first order EWPT is a sizable scalar quartic term, |S| 2 |H| 2 , by which the Higgs becomes a portal to the dark sector.…”