Revisit to non-decoupling MSSM

Abstract

Editor: M. Cvetič Dipole operatorsσ μν F μν b requires the helicity flip in the involving quark states thus the breaking of chiral U (3) Q × U (3) d .On the other hand, the b quark mass generation is also a consequence of chiral U (3) Q × U (3) d symmetry breaking. Therefore, in many models, there might be strong correlation between the b → sγ and b quark Yukawa coupling. In this Letter, we use non-decoupling MSSM model to illustrate this feature. In the scenario, the light Higgs boson may evade the direct search experiments at LEPII or Tevatron while the 125 GeV Higgs-like boson is identified as the heavy Higgs boson in the spectrum. A light charged Higgs is close to the heavy Higgs boson which is of 125 GeV and its contribution to b → sγ requires large supersymmetric correction with large PQ and R-symmetry breaking. The large supersymmetric contribution at the same time significantly modifies the b quark Yukawa coupling. With combined flavor constraints B → X s γ and B s → μ + μ − and direct constraints on Higgs properties, we find best fit scenarios with light stop of O(500 GeV), negative A t around −750 GeV and large μ-term of 2-3 TeV. In addition, reduction in bb partial width may also result in large enhancement of τ τ decay branching fraction. Large parameter region in the survival space under all bounds may be further constrained by H → τ τ if no excess of τ τ is confirmed at LHC. We only identify a small parameter region with significant H → hh decay that is consistent with all bounds and reduced τ τ decay branching fraction. In the end, if current dark matter mostly consists of neutralino, direct detection experiments like XENON100 also puts stringent bound over this scenario with light Higgs bosons. The light stops which are required by flavor constraints can further enhance the scattering cross section.

Light neutralino dark matter: direct/indirect detection and collider searches

“…These light Higgs bosons could be either CP-even or CP-odd. A light CP-even Higgs boson also appears in the non-decoupling solution of the MSSM [120][121][122][123]125]. They could give rise to new decay channels of the SM-like Higgs boson observed at the LHC and thus would be constrained by the current observations [113,[124][125][126].…”

“…A light CP-even Higgs boson also appears in the non-decoupling solution of the MSSM [120][121][122][123]125]. They could give rise to new decay channels of the SM-like Higgs boson observed at the LHC and thus would be constrained by the current observations [113,[124][125][126]. If the light Higgs bosons are present in the main annihilation channels for the DM, such as in the case of A 1 , H 1 -funnels, slight mixing with the MSSM Higgs sector is required to ensure large enough cross sections forχ 0 1χ 0 [106][107][108] has incorporated all these constraints on the light Higgs bosons.…”

“…We see that the exotic decays can be as large as 40% and still consistent with the current Higgs measurements. Given the possible decay final states of A 1 and H 1 to τ τ , bb or γγ, dedicated searches for these exotic multi-body decays of the SM-like Higgs could be fruitful in studying these solutions [113,[124][125][126]. A generic 7-parameter fit with extrapolation shows the LHC 14 TeV could bound the exotic decays of the Higgs boson up to 14 − 18% (7 − 11%) with 330 (3000) fb −1 of integrated luminosity [163], assuming the couplings of the Higgs boson to W and Z not exceeding the SM values [164].…”

Light top squark in precision top quark sample

“…In the decoupling MSSM limit, the 125 GeV new particle can be identified as the lightest CP-even Higgs boson h. In order to predict m h =125 GeV, a large A t is necessary for moderate light stops [21][22][23][24][25][26][27][28][29]. Such a large A t -term would lead to a big splitting of stop masses.…”

MSSM with $$m_\mathrm{h}=125$$ m h = 125 GeV in high-scale gauge mediation

“…Its implications in the context of the minimal supersymmetric standard model (MSSM) have been extensively explored, see, e.g, [3][4][5][6][7][8][9][10][11][12][13][14][15]. Specifically, a large loop-induced correction to m h is needed, and this requires either a large stop mass, ∼ several TeV for A t = 0, or ∼1 TeV for maximal mixing.…”