Positively deflected anomaly mediation in the light of the Higgs boson discovery

Abstract

Anomaly mediated supersymmetry breaking (AMSB) is a well-known mechanism for flavorblind transmission of supersymmetry breaking from the hidden sector to the visible sector. However, the pure AMSB scenario suffers from a serious drawback, namely, the tachyonic slepton problem, and needs to be extended. The so-called (positively) deflected AMSB is a simple extension to solve the problem and also provides us with the usual neutralino lightest superpartner (LSP) as a good candidate for dark matter in the Universe. Motivated by the recent discovery of the Higgs boson at the large hadron collider (LHC) experiments, we perform the parameter scan in the deflected AMSB scenario by taking into account a variety of phenomenological constraints such as the dark matter relic density and the observed Higgs boson mass around 125-126 GeV. We identify the allowed parameter region and list benchmark mass spectra. We find that in most of the allowed parameter regions, the dark matter neutralino is Higgsino-like and its cross section of the elastic scattering with nuclei is within the future reach of the direct dark matter search experiments, while (colored) sparticles are quite heavy and their discovery at the LHC is challenging.

Dark matter in U(1) extensions of the MSSM with gauge kinetic mixing

“…The rotation (8) ensures that there is no explicit kinetic mixing in the Lagrangian written in the new basis (V Y , V E ). However, the effect of the kinetic mixing term now transfers to the interactions between the Abelian vector superfields and chiral superfields.…”

“…Moreover, the parameter regions with maximal stop mixing which allow to obtain the observed Higgs mass potentially have a metastable electroweak vacuum, and predict a global minimum which breaks charge and/or color symmetries [4][5][6]. In scenarios where the number of free parameters is limited due to some relations at a high energy scale, heavy squarks imply heavy sleptons [7,8]. Hence, the SUSY contribution to the muon anomalous magnetic dipole moment (g − 2) can hardly explain the discrepancy between the SM prediction and the experimental result.…”

NMSSM with generalized deflected mirage mediation

“…It is well known that purely anomaly mediation mechanism is bothered by the tachyonic slepton problem [12][13][14][15][16][17][18]. One of its non-trivial extensions with a messenger sector, namely the deflected anomaly mediation SUSY breaking (AMSB) scenario, can elegantly solve such a tachyonic slepton problem through the deflection of the RGE trajectory [19][20][21][22][23][24][25] by additional gauge [26][27][28][29][30][31][32] or Yukawa mediation contributions. Such a messenger sector can also be present in the mirage mediation scenarios and play an important role in generating a preferable low energy SUSY spectrum.…”

NMSSM from alternative deflection in generalized deflected anomaly mediated SUSY breaking

“…Although there are many possible ways to tackle such tachyonic slepton problem, the most elegant solution from aesthetical point of view is the deflected AMSB [11][12][13][14] (dAMSB) scenario. In deflected AMSB, additional messenger sectors are introduced to deflect the AMSB trajectory and additional gauge mediation contributions can possibly push the negative slepton squared masses to positive values [15,16]. On the other hand, N ≥ 4 species are always needed to give positive slepton squared masses with naturally negative deflection parameters, possibly leading to strong gauge couplings below GUT scale or Landau pole below Planck scale.…”