Ja n 20 01 Particle Identification by Multifractal Parameters in γ - Astronomy with the HEGRA - Čerenkov - Telescopes HEGRA Collaboration

Čerenkov images of air showers can also be classified using multifractal and wavelet parameters, as compared to the conventional Hillas image parameters. This new technique was applied to the images recorded by the cameras of the stereoscopic imaging air Čerenkov-telescopes operated by the HEGRA collaboration. With respect to the identification of particles, the performance of multifractal and wavelet parameters was examined using a data sample from the observation of the active galaxy Mkn 501 that showed a high γ-ray flux. The multifractal parameters were also combined with the Hillas parameters using a neural network approach in order to further improve the γ/hadron-separation.