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Low energy supersymmetric models provide a solution to the hierarchy problemand also have the necessary ingredients to solve two of the most outstandingissues in cosmology: the origin of the baryon asymmetry and the source of darkmatter. In the MSSM, weak scale generation of the baryon asymmetry may beachieved in the presence of light stops, with masses lower than about 130 GeV.Moreover, the proper dark matter density may be obtained in the stop-neutralinoco-annihilation region, where the stop-neutralino mass difference is smallerthan a few tens of GeV. Searches for scalar top quarks (stops) in pairproduction processes at the Tevatron and at the Large Hadron Collider (LHC)become very challenging in this region of parameters. At the LHC, however,light stops proceeding from the decay of gluino pairs may be identified,provided the gluino mass is smaller than about 900 GeV. In this article wepropose an alternative method for stop searches in the co-annihilation region,based on the search for these particles in events with missing energy plus onehard photon or jet. We show that this method is quite efficient and, whencomplemented with ongoing Tevatron searches, allows to probe stop masses up toabout 160 GeV, fully probing the region of parameters consistent withelectroweak baryogenesis in the MSSM.

Light Stop Searches at the LHC in Events with One Hard Photon or Jet and Missing Energy