This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (search for hidden particles) experiment is intended to hunt for new physics in the largely unexplored domain of very weakly interacting particles with masses below the Fermi scale, inaccessible to the LHC experiments, and to study tau neutrino physics. The same proton beam setup can be used later to look for decays of tau-leptons with lepton flavour number non-conservation, and to search for weakly-interacting sub-GeV dark matter candidates. We discuss the evidence for physics beyond the standard model and describe interactions between new particles and four different portals - scalars, vectors, fermions or axion-like particles. We discuss motivations for different models, manifesting themselves via these interactions, and how they can be probed with the SHiP experiment and present several case studies. The prospects to search for relatively light SUSY and composite particles at SHiP are also discussed. We demonstrate that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.
Bibliographical noteFunding Information:
The work of T Asaka was supported in part by JSPS KAKENHI Grant Numbers 25400249 and 26105508. The work of C Corral was supported by CONICYT (Chile) under Grant No.21130179. The work of P S B Dev and A Pilaftsis is supported by the Lancaster-Manchester-Sheffield Consortium for Fundamental Physics under STFC grant ST/L000520/1. The work of Christophe Grojean was supported in part by the Marie Curie Career Integration Grant 631962, by the Spanish Ministry MICINN under contract FPA2010-17747 and by the Generalitat de Catalunya grant 2014-SGR-1450.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)