Superparticle phenomenology from the natural mini-landscape

Abstract

The methodology of the heterotic mini-landscape attempts to zero in on phenomenologically viable corners of the string landscape where the effective low energy theory is the Minimal Supersymmetric Standard Model with localized grand unification. The gaugino mass pattern is that of mirage-mediation. The magnitudes of various SM Yukawa couplings point to a picture where scalar soft SUSY breaking terms are related to the geography of fields in the compactified dimensions. Higgs fields and third generation scalars extend to the bulk and occur in split multiplets with TeV scale soft masses. First and second generation scalars, localized at orbifold fixed points or tori with enhanced symmetry, occur in complete GUT multiplets and have much larger masses. This picture can be matched onto the parameter space of generalized mirage mediation. Naturalness considerations, the requirement of the observed electroweak symmetry breaking pattern, and LHC bounds on mg together limit the gravitino mass to the m 3/2 ∼ 5-60 TeV range. The mirage unification scale is bounded from below with the limit depending on the ratio of squark to gravitino masses. We show that while natural SUSY in this realization may escape detection even at the high luminosity LHC, the high energy LHC with √ s = 33 TeV could unequivocally confirm or exclude this scenario. It should be possible to detect the expected light higgsinos at the ILC if these are kinematically accessible, and possibly also discriminate the expected compression of gaugino masses in the natural mini-landscape picture from the mass pattern expected in models with gaugino mass unification. The thermal WIMP signal should be accessible via direct detection searches at the multi-ton noble liquid detectors such as XENONnT or LZ.

Midi-review: Status of weak scale supersymmetry after LHC Run 2 and ton-scale noble liquid WIMP searches

“…The spectrum of Higgs bosons and superpartners from the mini-landscape [123] is thus expected to be rather similar to that expected from the full landscape of MSSM theories provided both invoke a natural solution to the SUSY µ problem with µ ∼ 100 − 300 GeV [114].…”

Diluting SUSY flavour problem on the Landscape

“…The second figure show the same data in terms of a histogram, where as we can see the mean value is close to zero and the variance is as expected from the formulae in eqs. (26,27).…”

“…Large number of sequestered hidden sectors have also been considered recently in [19][20][21], in models with multiple (pseudo)goldstini. Other works which have addressed supersymmetric soft spectrum phenomenology from the landscape following [22] include [23][24][25][26].…”

Aspects of the same-sign diboson signature from wino pair production with light higgsinos at the high luminosity LHC

“…[33], it was emphasized that for natural SUSY models with gaugino mass unification, the pp → Z 1Z2 j reaction followed byZ 2 → l þ l −Z 1 decay, combined with the SSdB channel, would cover the majority of natural SUSY parameter space with Δ EW < 30 at the high luminosity LHC. This conclusion no longer obtains in string-motivated models such as natural generalized mirage mediation [34] or the minilandscape [35] where the compressed spectrum of gauginos may allow for both wino and gluino masses beyond HL-LHC reach even while maintaining naturalness.…”