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Non-statistical event-by-event fluctuations are considered an importantsignal for the critical endpoint of the QCD phase diagram. Event-by-eventfluctuations of different observables are thus investigated in detail incurrent experiments. In this contribution, a study of the centrality dependenceof event-by-event fluctuations of particle yield ratios by the NA49 experimentin Pb+Pb collisions at 158A GeV beam energy is presented for the first time. Anincrease of the absolute values of dynamical fluctuations towards lowercentralities is observed. The influence of resonance decays will be discussed.Event-by-event fluctuations are an important observable to be studied at thefuture CBM experiment at FAIR. CBM will investigate the intermediate region ofthe QCD phase diagram in great detail searching for the first order phasetransition line and the expected critical endpoint. It is therefore importantto investigate the sensitivity of the CBM detector to particle ratiofluctuations in Au+Au collisions at 10-45 AGeV beam energy. Detailed simulationstudies will be presented.

Event-by-event Particle Yield Ratio Fluctuations in the CBM and NA49 Experiments