CERN Accelerating science

Scientific Committee Paper
Report number	arXiv:1811.00927 ; CERN-LHCC-2018-025 ; LHCC-I-031 ; LHCC-I-031
Title	A Letter of Intent for MATHUSLA: a dedicated displaced vertex detector above ATLAS or CMS.
Project Manager/Technical Coordinator	Lubatti, Henry; Young, Charles
Author(s)	Alpigiani, Cristiano (Washington U., Seattle) ; Ball, Austin (CERN) ; Barak, Liron (Tel Aviv U.) ; Beacham, James (Ohio State U.) ; Benhammo, Yan (Tel Aviv U.) ; Cao, Tingting (Tel Aviv U.) ; Camarri, Paolo (INFN, Rome2 ; Rome U., Tor Vergata) ; Cardarelli, Roberto (INFN, Rome2) ; Rodríguez-Cahuantzi, Mario (Puebla U., Mexico) ; Chou, John Paul (Rutgers U., Piscataway) ; Curtin, David (Toronto U.) ; Diamond, Miriam (SLAC) ; Di Sciascio, Giuseppe (INFN, Rome2) ; Drewes, Marco (Louvain U., CP3) ; Eno, Sarah C. (Maryland U.) ; Etzion, Erez (Tel Aviv U.) ; Essig, Rouven (SUNY, Stony Brook) ; Evans, Jared (Cincinnati U.) ; Fischer, Oliver (KIT, Karlsruhe, IKP) ; Giagu, Stefano (U. Rome La Sapienza (main)) ; Gomes, Brandon (Rutgers U., Piscataway) ; Haas, Andy (New York U.) ; Heng, Yuekun (Beijing, Inst. High Energy Phys.) ; Iaselli, Giuseppe (Bari Polytechnic) ; Johns, Ken (Arizona U.) ; Karagoz, Muge (Maryland U.) ; Kasper, Luke (Rutgers U., Piscataway) ; Kvam, Audrey (Washington U., Seattle) ; Lazic, Dragoslav (Boston U.) ; Li, Liang (Shanghai Jiao Tong U.) ; Liberti, Barbara (INFN, Rome2) ; Liu, Zhen (Fermilab) ; Lubatti, Henry (Washington U., Seattle) ; Marsella, Giovanni (Salento U.) ; McCullough, Matthew (CERN) ; McKeen, David (TRIUMF) ; Meade, Patrick (SUNY, Stony Brook) ; Mizrachi, Gilad (Tel Aviv U.) ; Morrissey, David (TRIUMF) ; Moshe, Meny Raviv (Tel Aviv U.) ; Caballero-Mora, Karen Salomé (Chiapas Autonoma U.) ; Paye Mamani, Piter A. (Bolivia U.) ; Policicchio, Antonio (U. Rome La Sapienza (main)) ; Proffitt, Mason (Washington U., Seattle) ; Reggiani-Guzzo, Marina (Campinas State U.) ; Rothberg, Joe (Washington U., Seattle) ; Santonico, Rinaldo (INFN, Rome2 ; Rome U., Tor Vergata) ; Schioppa, Marco (Calabria U. ; INFN, Cosenza) ; Shelton, Jessie (Illinois U., Urbana (main)) ; Shuve, Brian (Harvey Mudd Coll.) ; Subieta Vasquez, Martin A. (Bolivia U.) ; Stolarski, Daniel (Carleton U.) ; de Roeck, Albert (CERN) ; Fernández Téllez, Arturo (Puebla U., Mexico) ; Muñoz, Guillermo Tejeda (Puebla U., Mexico) ; Hernández, Mario Iván Martínez (Puebla U., Mexico) ; Silver, Yiftah (Tel Aviv U.) ; Thayil, Steffie Ann (Rutgers U., Piscataway) ; Torro, Emma (Washington U., Seattle) ; Tsai, Yuhsin (Maryland U.) ; Arteaga-Velázquez, Juan Carlos (IFM-UMSNH, Michoacan) ; Watts, Gordon (Washington U., Seattle) ; Young, Charles (SLAC) ; Zurita, Jose (KIT, Karlsruhe, IKP ; KIT, Karlsruhe, TTP)
Corporate author(s)	CERN. Geneva. The LHC experiments Committee
Series	(Letter of Intent)
Submitted by	[email protected] on 17 Jul 2018
Referee	[email protected] on 30 Jul 2018
Subject category	Detectors and Experimental Techniques
Abstract	In this Letter of Intent we propose the construction of MATHUSLA (MAssive Timing Hodoscope for Ultra-Stable neutraL pArticles) [1], a dedicated large-volume displaced vertex detector (DV) for the HL-LHC on the surface above ATLAS or CMS. Such a detector, which can be built using existing technologies with a reasonable budget in time for the HL-LHC upgrade, could search for neutral long-lived particles (LLPs) without trigger limitations and with very low or zero backgrounds, allowing it to probe LLP cross sections and lifetimes up to several orders of magnitude beyond the reach of ATLAS or CMS. MATHUSLA would also act as a cutting-edge cosmic ray telescope at CERN, exploring many open questions in cosmic ray and astro-particle physics.
Copyright/License	preprint: (License: CC-BY-4.0)

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