Proceedings of the Third High-Energy Physics International Conference HEP-MAD 07

This is the Third of the series of HEP-MAD conference organized regularly every 2 or 3 years in Madagascar, The conference is expected to involve few numbers of physicists from abroad and equal numbers of experimental and theoretical high-energy physicists. HEP-MAD aims to have a wide view of physics: from High-Energy to Astro Physics. National contributions cover Nuclear and Environment Physics and the new form of energies. This conference is a compromise between a standard one where specialized topics are presented and an introductory school to each subjects.It gives the opportunity for high-energy physicists to promote the field of high-energy physics (theory and experiments)in Madagascar. In the same time, the meeting will permit to the participants to discover the country (well-known about its bio-diversity and rare animal and plant species) and its tradition and population from different origins.The theoretical and experimental talks cover different aspects of high-energy physics which are in the form of introductional reviews to the field, short contributions and posters. These talks are complemented by other national talks in other areas of physics.