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        "markdown": "# FACET: A new long-lived particle detector in the very forward region of the CMS experiment\n\nS. Cerci,a,1 D. Sunar Cerci,a,1 D. Lazic,b G. Landsberg,c,2 F. Cerutti,d M. Sabaté-Gilarte,d M.G. Albrow,e,2 J. Berryhill,e D.R. Green,e J. Hirschauer,e S. Kulkarni,f J.E. Brücken,g L. Emediato,h A. Mestvirishvili,h J. Nachtman,h Y. Onel,h A. Penzo,h O. Aydilek,i B. Hacisahinoglu,i S. Ozkorucuklu,i,2 H. Sert,i C. Simsek,i C. Zorbilmez,i I. Hos, $^ { j , 1 }$ N. Hadley,k A. Skuja,k M. Du,l R. Fang,l Z. Liu,l B. Isildak $^ { m , 1 }$ and V.Q. Tran $^ { n , o }$\n\naDepartment of Physics, Adiyaman University, 02040, Adiyaman, Turkey   \nbPhysics Department, Boston University, 590 Commonwealth Ave, Boston, MA 02215, U.S.A. cDepartment of Physics, Brown University, 182 Hope St, Providence, RI 02912, U.S.A.   \ndCERN, 1211 Geneva 23, Switzerland   \neFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, U.S.A.   \nf Institute of Physics, NAWI Graz, University of Graz, Universitätsplatz 5, A-8010 Graz, Austria gHelsinki Institute of Physics, University of Helsinki, Gustaf Hällströmin katu 2, 00560 Helsinki, Finland   \n$h$ Department of Physics and Astronomy, University of Iowa, 203 Van Allen Hall, Iowa City, IA 52242, U.S.A.   \niPhysics Department, Istanbul University, Vezneciler Caddesi, 34134, Istanbul, Turkey   \n$j$ Department of Engineering Sciences, Istanbul University-Cerrahpasa, 34320 Avcilar, Istanbul, Turkey   \nkDepartment of Physics, University of Maryland, College Park, MD 20742, U.S.A.   \nlDepartment of Physics, Nanjing University, Nanjing 210093, China   \n$_ { m }$ Department of Natural and Mathematical Sciences, Ozyegin University, Orman Sk 13, 34794, Istanbul, Turkey   \nnTsung Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China   \noFaculty of Fundamental Sciences, PHENIKAA University, Yen Nghia, Ha Dong, Hanoi 12116, Vietnam   \nE-mail: Salim.Cerci@cern.ch, Deniz.Sunar.Cerci@cern.ch,   \nDragoslav.Lazic@cern.ch, Greg.Landsberg@cern.ch,   \nFrancesco.Cerutti@cern.ch, Marta.Sabate.Gilarte@cern.ch,   \nalbrow@fnal.gov, Jeffrey.Berryhill@cern.ch, dgreen@fnal.gov,   \njhirsch@fnal.gov, suchita.kulkarni@uni-graz.at,   \njens.brucken@helsinki.fi, lregisem@cern.ch,   \nAlexi.Mestvirishvili@cern.ch, Jane.Nachtman@cern.ch,   \nyasar-onel@uiowa.edu, Aldo.Penzo@cern.ch, Orhan.Aydilek@cern.ch,   \nBurak.Hacisahinoglu@cern.ch, Suat.Ozkorucuklu@cern.ch,   \nHale.Sert@cern.ch, Cagdas.Simsek@cern.ch, Caglar.Zorbilmez@cern.ch,   \nIlknur.Hos@cern.ch, hadley@umd.edu, skuja@umd.edu,   \nmg1722004@smail.nju.edu.cn, 141150012@smail.nju.edu.cn,   \nzuoweiliu@nju.edu.cn, Bora.Isildak@cern.ch, vqtran@sjtu.edu.cn\n\nAbstract: 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 ForwardAperture 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.\n\nKeywords: Beyond Standard Model, Exotics, Hadron-Hadron Scattering, Dark Matter, Particle and Resonance Production\n\n# Contents\n\n1 Introduction 1\n\n2 FACET as a New Subsystem of CMS 3\n\n3 Sensitivity to Long-Lived Particles 5\n\n3.1 Dark Photons   \n3.2 Heavy Neutral Leptons   \n3.3 Axion-Like Particles   \n3.4 Dark Higgs Bosons 9\n\n4 Triggers 10\n\n5 Backgrounds 11\n\n6 Summary 13\n\n7 Acknowledgments 13\n\n# 1 Introduction\n\nThe existence of long-lived particles (LLPs), i.e., particles with the proper lifetime $c \\tau$ in a macroscopic range, is predicted in many models of physics beyond the standard model (BSM). Generally, LLPs are naturally expected in models with small mass splittings between the adjacent states (e.g., in supersymmetric models) or with suppressed couplings to standard model (SM) particles. In particular, LLPs are often present in particle dark matter (DM) models, where they serve as portals between the DM and SM particles. The existence of DM is well established from astronomical observations and cosmology. It is generally assumed that DM consists of BSM particles . While searches for such particles in the TeV mass range continue at the CERN Large Hadron Collider (LHC), the possibility that new particle