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The search for photons at EeV energies and beyond has considerableastrophysical interest and will remain one of the key challenges for ultra-highenergy cosmic ray (UHECR) observatories in the near future. Several upperlimits to the photon flux have been established since no photon has beenunambiguously observed up to now. An improvement in the reconstructionefficiency of the photon showers and/or better discrimination tools are neededto improve these limits apart from an increase in statistics. Following thisdirection, we analyze in this work the ability of the surface parameter Sb,originally proposed for hadron discrimination, for photon search.  Semi-analytical and numerical studies are performed in order to optimize Sbfor the discrimination of photons from a proton background in the energy rangefrom 10^18.5 to 10^19.6 eV. Although not shown explicitly, the same analysishas been performed for Fe nuclei and the corresponding results are discussedwhen appropriate. The effects of different array geometries and theunderestimation of the muon component in the shower simulations are analyzed,as well as the Sb dependence on primary energy and zenith angle.

Improving photon-hadron discrimination based on cosmic ray surface detector data