14thNov. 2003	Calibration and First Results from HESS	talk in pdf
10:30	Dr. Patrick Berghaus (Collège de France)

The HESS Imaging Cherenkov Telescope Array has been taking data since summer 2002. In this talk, a summary of the calibration procedure and first observation results will be presented. Special emphasis is given to the camera pointing correction.

7thNov. 2003	Searches for New Phenomena at Colliders	talk in pdf
14:30	Dr. Emmanuelle Perez (CEA - Saclay)

I will present the status of searches for exotic phenomena at the LEP, HERA and Tevatron colliders. I will review some "interesting" observations and will present the existing constraints on several models extending the Standard Model, with some emphasis on the complementarity between the different experiments.

6thFeb. 2004	Dark matter: models and methods for detection	talk in pdf
14:30	Prof. Lars Bergström (SCFAB, Stockholm University)

Abstract: One of the largest mysteries in present-day cosmology concerns the existence of dark matter. New data on the microwave background shows that this dark matter has to be non-baryonic, and thus lies outside the Standard Model of particle physics. In this talk, a general review of the evidence for dark matter will be made, and some promising candidates will be displayed. In particular, models based on supersymmetry will be discussed, and prospects for direct or indirect detection be made.

22thApril 2004	Pentaquarks of baryons: predictions, discoveries and implications
14:30	Prof. M. Polyakov (ULg)

Abstract: We review theoretical ideas about the nature of the recently discovered pentaquark states. Special attention is paid to the soliton picture of baryons.

30thApril 2004	Virgo and the quest for Gravitational Waves	talk in pdf
14:30	Dr. Fabien Cavalier (LAL - Université de Paris Sud)

Abstract: Virgo is an French-Italian collaboration which builds a kilometric interferometer for the direct detection of gravitational waves. After several years of construction and a first commissioning of the central part, the commissioning of the full instrument has begun in september 2003. First of all, the possible sources of gravitational waves will be described and the principle of interferometric detection will be given. On the other hand, the Virgo experiment will be presented and the first results obtained during the commissioning will be discussed.

27thMay 2004	Deep Inelastic Scattering, Regge theory and DGLAP evolution	talk in pdf
14:30	Dr. Grégory Soyez (Liège)

Abstract: The talk shall basically contain three parts. In the first part, I shall introduce two important approaches to the Deep Inelastic Scattering: DGLAP evolution in perturbative QCD (pQCD) on one side and S-matrix theory through Regge theory on the other side. In the second part, I shall show how we can use t-channel unitarity to obtain the photon-photon amplitude from the proton-proton and the photon-proton amplitudes. I shall show how multiple-poles Regge models can be applied to predict the photon structure functions. In the third part, I shall show how we can use Regge theory to constraint the initial condition in the DGLAP global fits. In this approach, the small Q2 data are described with Regge theory while the large Q2 domain is described by pQCD. I shall finally discuss the applicability of Regge theory at large Q2.

Thu. 24thJune 2004	The Pierre Auger Observatory and the detection of ultra-high energy neutrinos
14:30	Dr. Veronique Van Elewyck (Universidad Nacional Autonoma de Mexico)

Abstract: The Pierre Auger Observatory (PAO), whose southern site is being deployed in Malargue (Argentina), combines fluorescence telescopes and an air shower array at ground level with the objective of exploring the ultra-high energy cosmic ray spectrum (above 1018 eV), especially around the "GZK barrier" corresponding to the interaction with the cosmic microwave background (CMB). Although the main goal of the PAO is the observation and characterization of hadronic cosmic rays (protons and heavier nuclei), it should also enable us to study ultra-high energy neutrinos through the detection of quasi-horizontal, deeply penetrating air showers. After describing the main features of the PAO, I will survey the possible sources of ultra-high energy neutrinos and the associated fluxes. Then I'll discuss the type of signals which these can produce in the detector, as well as the (still preliminary) estimations of the expected number of events.

Fri. 25thJune 2004	Measurement of the longitudinal polarisation at HERA with a Fabry-Perot cavity	talk in ps.gz
14:30	Dr. Marie Jacquet (Orsay)

Abstract: In 2001-2002, large machine upgrades have been done at the HERA electon-proton collider. In particular, the lepton beam is now longitudinally polarised at H1 and Zeus interaction points. And because a precise knowledge of this polarisation is necessary to measure accuratly physic observables, an upgrade of the HERA longitudinal polarimeter have been proposed. This new polarimeter is based on a Fabry-Perot cavity. Before its installation at HERA in summer 2003, the cavity has been built and operated at Orsay. The main results obtained at Orsay during these development and test phases are exposed as well as the actual status of the cavity at DESY.