The FACET Project: Forward Aperture CMS ExTension to search for new Long-Lived Particles
Abstract
FACET is a proposed new subsysem for CMS to search for portals such as dark photons, dark higgs, heavy neutral leptons and axion-like particles in the very forward direction at the High Luminosity LHC. Such particles can penetrate up to 50 m of iron and then decay inside a 14 m3 vacuum pipe made by enlarging an 18 m long section of the LHC pipe to a radius of 50 cm.
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