New Physics; Long Lived Particles; Secluded Sector; Majorana neutrinos; LHCb upgrade; Charm meson decays; Fixed target experiment
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The Standard Model of particle physics describes all known microscopic phenomena with great precision. However, it is not considered a complete theory of fundamental interactions. The main experimental evidences of the failure of the Standard Model are: the existence of Dark Matter and the matter-antimatter asymmetry in the Universe.For these reasons the search for new particles, that might complete the Standard Model and solve its problems, has been one of the main area of research in particle physics in the last decades. This is also one of the main goals of the LHC experiments. However, up to this moment there is not yet a microscopic evidence of the existence of such new particles. In particular, the recent discovery of a Higgs-like boson with a mass of about 125 GeV can be interpreted as a strong confirmation of the Standard Model.It is possible that new particles couple too weakly with Standard Model particles and therefore escape detection. This would imply that these new particles should be searched for at the high intensity frontier rather than at the high energy frontier.I propose to search for these particles at two complementary facilities: the SHIP experiment and the LHCb upgrade. The SHIP experiment is a new fixed-target experiment at the Super Proton Synchrotron (SPS) of CERN, which would offer the unique possibility to open up a new window in the search for hidden particles with long lifetimes. The applicant is one of the initiators of this experiment and he is responsible for sensitivity studies to the different models with long living particles. Here, I propose to further optimise the facility and extend the physics case of the SHIP experiment. I propose to search for hidden particle with shorter lifetime at the LHCb upgrade. To fully exploit the LHCb upgrade potential, dedicated reconstruction, trigger and selection algorithms for long living particles will be developed.This approach is novel in its scope and in its methods and it can have a large impact on the field of particle physics. Given the present experimental status and the foreseen upgrade of SPS and LHCb this is the ideal time to pursue this project.