Abstract
Abstract We compare the experimental prospects of direct stop and sbottom pair production searches at the LHC. Such searches for stops are of great interest as they directly probe for states that are motivated by the SUSY solution to the hierarchy problem of the Higgs mass parameter — leading to a “Natural” SUSY spectrum. Noting that sbottom searches are less experimentally challenging and scale up in reach directly with the improvement on b-tagging algorithms, we discuss the interplay of small TeV scale custodial symmetry violation with sbottom direct pair production searches as a path to obtaining strong sub-TeV constraints on stops in a natural SUSY scenario. We argue that if a weak scale natural SUSY spectrum does not exist within the reach of LHC, then hopes for such a spectrum for large regions of parameter space should “sbottom out”. Conversely, the same arguments make clear that a discovery of such a spectrum is likely to proceed in a “sbottom up” manner.
Highlights
JHEP05(2012)139 scale MSUSY to this sector, which leads to large perturbative corrections to Lagrangian parameters linked to the EWSB scale v ∼ 246 GeV without fine tuning
The second restriction comes from the paradigm of natural SUSY with minimal fine tuning, namely that the stop sector should be close to the electroweak symmetry breaking scale
We have exploited the minimal consistency constraints associated with experimentally motivated limits of custodial symmetry violation to link the stops — and the issue of fine-tuning — to the comparatively cleaner and more promising searches for sbottoms
Summary
We consider three sources of minimal consistency constraints on the stop sector before discussing the experimental prospects of stop and sbottom searches . Due to EWPD constraints and/or insisting on SUL(2) preserving soft masses, raising the direct exclusion limit of mb indirectly yields an exclusion constraint in the space of (mt, mt2, θt) The constraints on this space are likely to be driven by sbottom searches for large regions of parameter space, as we will discuss. In a natural SUSY spectrum, one expects light Higgsinos as their mass is driven by the μ parameter, and relatively light gluinos with a mass scale 1 TeV This later expectation follows from the one loop correction that gluinos generate for stop masses, which contributes to eq (2.9) at two loops. The contributions from these particles to this fine tuning measure are sub dominant and neglected.
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