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It is generally believed that any particle to be discovered will have aTeV-order mass. Given its great mass, it must have a large decay width.Therefore, the interference effect will be very common if they and theStandard-Model (SM) particles contribute to the same final state.However, theinterference effect could make a new particle show up not like a resonance, andit is difficult to search and measure its properties. In this work, amodel-independent method, F2F (Fit To Fourier coefficients), is proposed tosearch for an unknown resonance and to determine its mass ($M$) and width($\Gamma$) in the presence of interference. Basically we express the sum ofreosnant signal and the interference as a cosine Fourier series and relate theFourier coefficients with the mass and width. The relation is based on thegeneral propagator form, $1/(x^2-M^2+iM\Gamma)$. Thus it does not need anysignal model. Toy experiments show that the obtained mass and width agree wellwith the inputs with a similar precision as using an explicit signal model. Wealso show that we can apply this method to measure the Stardard-Model Higgswidth and to make statistic interpretation in searching for new resonanceallowing for interference.

F2F, a model-independent method to determine the mass and width of a particle in the presence of interference