FACET: a new long-lived particle detector in the very forward region of the CMS experiment
S. Cerci, D. Sunar Cerci, D. Lazic, G. Landsberg, F. Cerutti, M. Sabaté-Gilarte, M. G. Albrow, Jeffrey Berryhill, D. R. Green, J. Hirschauer, Suchita Kulkarni, E. Brücken, Luiz Emediato, Alexi Mestvirishvili, J. Nachtman, Y. Onel, A. Penzo, O. Aydilek, B. Hacışahinoğlu, S. Özkorucuklu, H. Sert, C. Simsek, Ç. Zorbilmez, İ. Hoş, N. J. Hadley, A. Skuja, Mingxuan Du, Rundong Fang, Zhihong Liu, B. Isildak, Van Que Tran
Abstract
A bstract 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 F orward- A perture C MS E x T ension, 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.