Search for single photon events with large missing E T in pp collisions at LHC with the ATLAS detector

ALONSO FRANCISCO

Arequipa

Otro; CERN Latin American School in HEP 2013; 2013

CERN

Supersymmetry (SUSY) introduces a simmetry between fermions and bosons, resulting in a SUSY partner (sparticle) with identical quantum numbers except a difference by a half a unit of spin for each Standar Model particle. As none of these sparticles have been observed, SUSY must be a broken symmetry if realised in nature.In gauge-mediated SUSY breaking (GMSB) models, the LSP is the gravitino, and its experimental signatures are largely determined by the nature ofthe next-to-lightest SUSY particle, which for a large part of the GMSB parameter space is the lightest neutralino. The lightest neutralino is a mixture of gaugino and higgsino eigenstates, and therefore decays to either a , Z or a Higgs boson.Searches for SUSY in ATLAS with photons in the final statehave been done for photon+MET, photon + (lepton/b) + MET. Here we focus in photon + Z + MET.