Physics Prospects at the High-Luminosity LHC

Anne-Marie Magnan

14:00-15:00, HEPHY, Library

The High-Luminosity LHC (HL-LHC) is an upgrade of the Large Hadron Collider located at CERN (Geneva, Switzerland). Designed to achieve instantaneous luminosities a factor of five larger than the LHC nominal value, this new machine will enable the experiments to enlarge their data sample by one order of magnitude compared with the LHC baseline programme. The project is now halfway down its path, with the machine scheduled to start for physics in 2026. The corresponding multi-purpose detectors, ATLAS and CMS, will be substantially upgraded in order to fully exploit the physics potential offered by the increase in luminosity, and to cope with the demanding operational conditions at the HL-LHC. In this seminar, I will cover briefly the detector upgrade studies, in particular concerning the new high-granularity end-cap calorimeter (HGCAL) for CMS, and then review the recent updates on the physics potential that the HL-LHC can achieve. The large number of events expected in almost all Higgs boson measurement channels will allow very precise measurements of Higgs boson cross section and coupling properties, a better understanding of its coupling to first and second generation fermions, of the Higgs boson trilinear self-coupling, and strong constraints on the exotic decay channels, including invisible decays. I will also briefly cover the prospects for dark matter searches, and searches for long-lived particles including dark photons.