Abstract
We study dark matter physics in the Minimal Supersymmetric Standard Model with non-universal gaugino masses at the unification scale. In this scenario, the specific ratio of wino and gluino masses realizes the electro-weak scale naturally and achieves 125 GeV Higgs boson mass. Then, relatively light higgsino is predicted and the lightest neutral particle, that is dominantly given by the neutral component of higgsino, is a good dark matter candidate. The direct detection of the dark matter is sensitive to not only a higgsino mass but also gaugino masses significantly. The upcoming XENON1T experiment excludes the parameter region where bino or gluino is lighter than about 2.5 TeV if the higgsino and the gaugino mass parameters have same signs. We see that the direct detection of dark matter gives stronger bound than the direct search at the LHC experiment when higgsino gives sizable contribution to the dark matter abundance.
Highlights
Wino mass to the gluino mass achieves the EW scale and the 125 GeV Higgs boson mass
This small mass difference makes it difficult to detect higgsino directly at the LHC, because their daughter particles are too soft to be distinguished from backgrounds and their lifetimes are too short to be recognized as charged tracks unlike the case that wino is the lightest SUSY particle (LSP) [45]
We study the dark matter physics in the Non-Universal Gaugino Mass scenario
Summary
The NUGM scenario is known as one of the attractive SUSY models to realize μ-parameter near the EW scale and the 125 GeV Higgs boson mass simultaneously. Let us assume that the all ratios of soft SUSY breaking parameters are fixed by some mediation mechanisms and the overall scale is given by M0. In this assumption, eq (2.1) corresponds to the relation between μ and M0. From the relation eq (2.1), the tuning measure of the μ-parameter can be written as ∆μ = 2|μ|2/m2Z up to radiative corrections to the condition, so that small |μ| is required to avoid the fine-tuning in this assumption The details of this kind of discussions in the NUGM scenario are shown in refs. A2t / m2tLm2tR increases and the SM-like Higgs boson mass around 125 GeV can be achieved due to the relatively large wino
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