Suche nach mikroskopischen schwarzen Löchern in den frühen Daten des ATLAS-Detektors am LHC

With the start of the LHC in 2010 a new era in Particle Physics has begun. In a yet unexplored kinematic regime, the Standard Model can be probed and new physics can be discovered with the ATLAS detector. In this work the search for microscopic black holes at the LHC is presented. Their discovery would unveil the existence of large extra dimensions. Theories of such, establishing low-scale gravity, address problems of the Standard Model like the hierarchy problem. Different search strategies are discussed, which are aimed at an early discovery with the centre-of-mass energies provided by the LHC. They exploit key features of the decay of black holes, namely high mass final states with a large multiplicity of objects with high pT. With the first 297 1/nb of sqrt(s) = 7TeV data, a search for such new physics is conducted. No deviations from Standard Model predictions are found, and consequently a limit on the cross section times acceptance of sigma × A < 0.46 nb at 95% CL is set. Theory predictions for the cross section are of the order O(10 - 100 pb), hence this result has an impact on theories of low-scale gravity.