The kinetic dark-mixing in the light of CoGENT and XENON100

Abstract

Several string or GUT constructions motivate the existence of a dark U (1)D gauge boson which interacts with the Standard Model only through its kinetic mixing. We compute the dark matter abundance in such scenario and the constraints in the light of the recent data from CoGENT, CDM-SII and XENON100. We show in particular that a region with relatively light WIMPS, MZ D < ∼ 40 GeV and a kinetic mixing 10 −4 < ∼ δ < ∼ 10 −3 is not yet excluded by the last experimental data and seems to give promising signals in a near future. We also compute the value of the kinetic mixing needed to explain the DAMA/CoGENT/CRESST excesses and find that for MZ D < ∼ 30 GeV, δ ∼ 10 −3 is sufficient to fit with the data.

Unitarity and monojet bounds on models for DAMA, CoGeNT, and CRESST-II

“…There are at least two well motivated ways to couple a new light Z to the SM without affecting the huge phenomenological success of the SM [36][37][38][39][40][41][42][43][44][45]. The first is to couple the new boson via kinetic mixing with the hypercharge vector.…”

Extra U(1), effective operators, anomalies and dark matter

“…(3.11) an approximate solution for the gluonic annihilation cross section (we ignore here the factors of X L − X R 9 The literature on the subject is very vast. We suggest for further reading [73][74][75][76][77] for dark matter constraints, [78] for LHC constraints, [79,80] for string motivations and [81,82] for other studies. 10 In all our study we use the conventions described in [76,77].…”

Extra U(1) as natural source of a monochromatic gamma ray line

“…It could be interesting to notice that in any of the cases discussed above, the direct detection rate is largely suppressed. Indeed, this rate can become important for a kinetic mixing around δ ≃ 10 −3 [29][30][31][32][33] and could even explain DAMA/CoGENT excess with δ ≃ 10 −2 . However, in the model we are considering, the "portal" between the dark matter sector and the visible one does not go through this kinetic mixing, but through the trivectorial couplings generated in eq.…”

“…The Dark Matter (DM) candidate ψ 0 could be the lightest (and thus stable) particle of this secluded sector. Such a mixing has been justified in recent string constructions [18][19][20][21][22], but has also been studied within a model independent approach [23][24][25][26][27][28][29][30][31][32][33] or in a supersymmetric extension [34][35][36][37].…”