FACET: a new long-lived particle detector in the very forward region of the CMS experiment

Cerci S., Sunar Cerci D., Lazic D., Landsberg G., Cerutti F., Sabaté-Gilarte M., ...More

Journal of High Energy Physics, vol.2022, no.6, 2022 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 2022 Issue: 6
  • Publication Date: 2022
  • Doi Number: 10.1007/jhep06(2022)110
  • Journal Name: Journal of High Energy Physics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, INSPEC, zbMATH, Directory of Open Access Journals
  • Keywords: Beyond Standard Model, Exotics, Hadron-Hadron Scattering, Dark Matter, Particle and Resonance Production
  • Yıldız Technical University Affiliated: No


We describe a proposal to add a set of very forward detectors to the CMS experiment for the high-luminosity era of the Large Hadron Collider to search for beyond the standard model long-lived particles, such as dark photons, heavy neutral leptons, axion-like particles, and dark Higgs bosons. The proposed subsystem is called FACET for Forward-Aperture CMS ExTension, and will be sensitive to any particles that can penetrate at least 50 m of magnetized iron and decay in an 18 m long, 1 m diameter vacuum pipe. The decay products will be measured in detectors using identical technology to the planned CMS Phase-2 upgrade.