Abstract
Abstract We perform a global fit to Higgs signal-strength data in the context of light stops in Natural SUSY. In this case, the Wilson coefficients of the higher dimensional operators mediating gg → h and h → γγ, given by c g , c γ , are related by c g = 3 (1 + 3α s /(2π))c γ /8. We examine this predictive scenario in detail, combining Higgs signal-strength constraints with recent precision measurements of m W , Br( $ \overline{B} $ → X s γ) constraints and direct collider bounds on weak scale SUSY, finding regions of parameter space that are consistent with all of these constraints. However it is challenging for the allowed parameter space to reproduce the observed Higgs mass value with sub-TeV stops. We discuss some of the direct stop discovery prospects and show how Higgs search data can be used to exclude light stop parameter space difficult to probe by direct collider searches. We determine the current status of such indirect exclusions and estimate their reach by the end of the 8 TeV LHC run.
Highlights
Light in order to keep the fine-tuning of the theory reasonably small
The Wilson coefficients of the higher dimensional operators mediating g g → h and h → γ γ, given by cg, cγ, are related by cg = 3 (1 + 3 αs/(2 π))cγ/8. We examine this predictive scenario in detail, combining Higgs signalstrength constraints with recent precision measurements of mW, Br(B → Xs γ) constraints and direct collider bounds on weak scale SUSY, finding regions of parameter space that are consistent with all of these constraints
This is the line of reasoning we develop in this paper, where we examine the current constraints on minimal NSUSY from these indirect probes
Summary
In generic SUSY scenarios motivated as a solution to the hierarchy problem, one expects all superpartners near the electroweak scale, with the soft breaking mass scale MSUSY not higher than O(1) TeV. In order to fix our notation, we write the parts of the low-energy Lagrangian most relevant for our analysis This Lagrangian is not supersymmetric as it applies below the scale of the heavy SUSY particles (with masses ∼ MSUSY 1 TeV). The quartic Hl coupling determines the light Higgs mass as usual and is the prime example of a coupling that receives sizeable SUSY-breaking corrections (that help in increasing the Higgs mass above its tree level minimal SUSY value below mZ). Such corrections will be discussed in subsection 5.A. where we used c2β = cos 2β, mt is the top mass and MQL, MtR, At are soft SUSY-breaking masses.
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