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Journal of High Energy Physics

, 2016:134 | Cite as

Distinguishing between MSSM and NMSSM through ∆F = 2 processes

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Regular Article - Theoretical Physics
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Abstract

We study deviations between MSSM and Z 3-invariant NMSSM, with respect to their predictions in ΔF = 2 processes. We find that potentially significant effects arise either from the well known double-penguin diagrams, due to the extra scalar NMSSM states, or from neutralino-gluino box contributions, due to the extended neutralino sector. Both are discussed to be effective in the large tan β regime. Enhanced genuine-NMSSM contributions in double penguins are expected for a light singlet spectrum (CP-even, CP-odd), while the magnitude of box effects is primarily controlled through singlino mixing. The latter is found to be typically subleading (but non-negligible) for λ ≲ 0.5, however it can become dominant for \( \uplambda \sim \mathcal{O}(1) \). We also study the low tan β regime, where a distinction between MSSM and NMSSM can come instead due to experimental constraints, acting differently on the allowed parameter space of each model. To this end, we incorporate the LHC Run-I limits from H → Z Z, A → h Z and H ± → τ ν non-observation along with Higgs observables and set (different) upper bounds for new physics contributions in ΔF = 2 processes. We find that a ∼ 25% contribution in ΔM s(d) is still possible for MFV models, however such a large effect is nowadays severely constrained for the case of MSSM, due to stronger bounds on the charged Higgs masses.

Keywords

Supersymmetry Phenomenology 
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Copyright information

© The Author(s) 2016

Authors and Affiliations

  1. 1.Department of High Energy PhysicsTata Institute of Fundamental ResearchMumbaiIndia
  2. 2.Department of Physics, Division of Theoretical PhysicsUniversity of IoanninaIoanninaGreece

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