Abstract
We explore the discovery potential of light gravitino mass m_{3/2} by combining future cosmology surveys and collider experiments. The former probe the imprint of light gravitinos in the cosmic matter density field, whereas the latter search signatures of a supersymmetry breaking mechanism. Free-streaming of light gravitinos suppresses the density fluctuations at galactic and sub-galactic length scales, where weak gravitational lensing can be used as a powerful probe. We perform numerical simulations of structure formation to quantify the effect. We then run realistic ray-tracing simulations of gravitational lensing to measure the cosmic shear in models with light gravitino. We forecast the possible reach of future wide-field surveys by Fisher analysis; the light gravitino mass can be determined with an accuracy of m_{3/2}=4\pm 1 eV by a combination of the Hyper Suprime Cam survey and cosmic microwave background anisotropy data obtained by Planck satellite. The corresponding accuracy to be obtained by the future Large Synoptic Survey Telescope is \delta m_{3/2}=0.6 eV. Data from experiments at Large Hadron Collider at 14 TeV will provide constraint at m_{3/2} \simeq 5 eV in the minimal framework of gauge-mediated supersymmetry breaking (GMSB) model. We conclude that a large class of the GMSB model can be tested by combining the cosmological observations and the collider experiments.
Highlights
With the vacuum expectation value of F -term F and the reduced Planck mass Mpl ≃ 2.43 × 1018 GeV
We forecast the possible reach of future wide-field surveys by Fisher analysis; the light gravitino mass can be determined with an accuracy of m3/2 = 4 ± 1 eV by a combination of the Hyper Suprime Cam survey and cosmic microwave background anisotropy data obtained by Planck satellite
While the cosmological observations place an upper bound on the gravitino mass, the terrestrial collider experiments such as on-going Large Hadron Collider (LHC) give a lower bound through signatures of other SUSY particles
Summary
In the GMSB models [8,9,10,11,12,13], the SUSY breaking is mediated from the hidden sector to the MSSM sector via some messenger fields that are charged under the standard model gauge group. The LHC current and future reach for the GMSB models is studied in detail in [15,16,17,18,19,20,21,22,23] It is generally model-dependent to connect masses of heavier SUSY particles and mass of the light gravitino. The collider lower bound on the light gravitino mass depends on properties of the messenger and hidden sectors, N5 and λx in the case of the minimal GMSB model as we can see from eqs. In order to derive specific constraints, we discuss the LHC constraints in section 5 by taking some specific focus point in the minimal GMSN model
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