Depuis plus de 20 ans, l'Accélérateur Grand Louvre d'Analyse Elémentaire (AGLAE) est exclusivement dédié à l'étude d'objets du patrimoine, à la croisée des sciences physiques et des sciences humaines. La nouvelle ligne de faisceau, complètement automatisée, a été inaugurée en 2017.

La conférence présentera les différentes étapes de l'achèvement de cet équipement d'excellence ainsi que les développements en cours et les défis à relever dans le futur.

The search for pevatrons (objects capable of accelerating 10$^{15}$ eV particles) has become one of the key targets of the high--energy gamma—ray community. These objects are of crucial importance in the context of the origin of cosmic rays (CRs), since the sources of Galactic CRs are expected to be pevatrons.
Currently, the most famous candidates for the origin of Galactic CRs are supernova remnants (SNRs), the shocks expanding in the interstellar medium after the explosion of  massive stars. But surprisingly, all detected SNRs have been shown to not be pevatrons, making the situation somewhat bewildering.
A special attention is currently being  devoted to the search of a SNR pevatron, and we will discuss the possibility of detecting and identifying one with next—generation gamma—ray instruments, such as the Cherenkov Telescope Array. 

The idea to use neutrinos as cosmic messengers dates back to the 1950s,
and the concept of Cherenkov Neutrino Telescopes deep underwater to the
year 1960. It took more than half a century before a detector large
enough to detect cosmic high-energy neutrinos was built: The IceCube
Neutrino Telescope at the South Pole. I will decribe the way towards
IceCube construction and sketch IceCube's main results, starting with
the discovery of a diffuse flux of cosmic neutrinos in 2013. I will also
try a look into the near future, where IceCube will be flanked by
telescopes of similar size in the Mediterranean Sea (KM3NeT) and in Lake
Baikal.

The presentation will focus on a recent search for non-standard Higgs bosons, performed with a data sample collected by the ATLAS experiment at the CERN Large Hadron Collider between 2015 and 2018, and relying on experimental signatures containing multiple leptons. After an introduction to the theoretical and experimental contexts, the discussion will be framed in terms of the search strategies used, with details on the backgrounds present in the regions of interest and the challenges encountered to estimate them precisely. The obtained results will be presented, followed by perspectives for future improvements.