Neutralino dark matter in gauge mediation after run I of LHC and LUX

Abstract

Neutralino can be the dark matter candidate in the gauge-mediated supersymmetry breaking models if the conformal sequestered mechanism is assumed in the hidden sector. In this paper, we study this mechanism by using the current experimental results after the run I of LHC and LUX. By adding new Yukawa couplings between the messenger fields and Higgs fields, we find that this mechanism can predict a neutralino dark matter with correct relic density and a Higgs boson with mass around 125 GeV. All our survived points have some common features. Firstly, the Higgs sector falls into the decoupling limit. So the properties of the light Higgs boson are similar to the predictions of the Standard Model one. Secondly, the correct EWSB hints a relatively small µ-term, which makes the lightest neutralino lighter than the lightest stau. So a bino-higgsino dark matter with correct relic density can be achieved. And the relatively small µ-term results in a small fine-tuning. Finally, this bino-higgsino dark matter can pass all current bounds, including both spin-independent and spin-dependent direct searches. The spin-independent cross section of our points can be examined by further experiments.

Hybrid anomaly and gravity mediation for electroweak supersymmetry

“…In other words in terms of some delicated model construction, the little hierarchy can be improved. For example, through introducing interactions between messenger and higgs the fine-tuning can be reduced to 2000 [61][62][63][64][65][66][67][68].…”

Towards the natural gauge mediation

“…There is generally no flavor problem since the gravitino mass m 3/2 is typically smaller than O(1) GeV. On the other hand, to generate a non-vanishing A t -term at the messenger scale and lift the Higgs boson mass, we can introduce the Higgs-messengers interaction [29][30][31][32][33][34][35][36]. Therefore, in this paper, we shall propose the GMSB with the generalized GM mechanism and Higgs-messenger interaction.…”

“…The discovery of a SM-like Higgs boson at 125 GeV as well as the natural SUSY assumption indicates a large A t -term in the MSSM. In order to generate a non-vanishing A t -term at the messenger scale, an extended Higgs-messenger coupling λ u H u Φ 1Φ2 has always been introduced in GMSB [29][30][31][32][33][34][35][36][37][38][39]. In those SUSY models, the Yukawa coupling λ d between H d and messenger fields always turns off, otherwise the µ/B µproblem will show up.…”

“…The GMSB models can be extended by introducing new Yukawa couplings between the Higgs sector and messengers [29][30][31][32][33][34][35][36][37][38][39]. In this paper, we modestly modify the exact sweet spot SUSY models by including the a direct interaction between Higgs field H u and messengers…”

Towards the Natural Gauge Mediation

“…There is generally no flavor problem since the gravitino mass m 3/2 is typically smaller than O(1) GeV. On the other hand, to generate a non-vanishing A t -term at the messenger scale and lift the Higgs boson mass, we can introduce the Higgs-messengers interaction [29][30][31][32][33][34][35][36]. Therefore, in this paper, we shall propose the GMSB with the generalized GM mechanism and Higgs-messenger interaction.…”