The ATLAS group at CPPM consists of about thirty-five members, including staff physicists, engineers and graduate students. It is member of the ATLAS collaboration at the LHC since 1994. From 1990 to 1994 the group has participated in the detector R&D program for the LHC and since 1994 took an active part in three important technical activities in ATLAS: the Pixels detector, the electromagnetic calorimeter and the trigger's event filter. In these three activities, the group was in particular project manager of the construction of the electromagnetic calorimeter endcaps, has participated to the construction and the assembling of 30% of the Pixel detector ladders and was coresponsible of the design and the implementation of the trigger's event filter.
The group has also participated actively in several test beam campaigns of the ATLAS detectors at CERN and to the integration and the qualification of the ATLAS detector on site.
In the context of the upgrade of the Pixel detector after the first stage of the LHC operation and later for the Super LHC phase, several members of the ATLAS group are actively involved in the R&D studies of the electronics and the cooling system of the future Pixel detector. Besides these technical activities, the group is very active in the studies of the performance of the ATLAS detector, in particular in the electron identification and the b-jet tagging algorithms.
Concerning the preparation of the physics analysis, the group is involved since many years in the top quark studies, the searches for the Higgs boson and more recently in the search for physics beyond the Standard Model of particle physics.