A Letter of Intent for MATHUSLA: a dedicated displaced vertex detector above ATLAS or CMS.

In this Letter of Intent (LOI) we propose the construction of MATHUSLA (MAssive Timing Hodoscope for Ultra-Stable neutraL pArticles), a dedicated large-volume displaced vertex detector 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) with up to several orders of magnitude better sensitivity than ATLAS or CMS, while also acting as a cutting-edge cosmic ray telescope at CERN to explore many open questions in cosmic ray and astro-particle physics. We review the physics motivations for MATHUSLA and summarize its LLP reach for several different possible detector geometries, as well as outline the cosmic ray physics program. We present several updated background studies for MATHUSLA, which help inform a first detector-design concept utilizing modular construction with Resistive Plate Chambers (RPCs) as the primary tracking technology. We present first efficiency and reconstruction studies to verify the viability of this design concept, and we explore some aspects of its total cost. We end with a summary of recent progress made on the MATHUSLA test stand, a small-scale demonstrator experiment currently taking data at CERN Point 1, and finish with a short comment on future work.

Andy Haas | Steffie Ann Thayil | Zhen Liu | Roberto Cardarelli | Liang Li | James Beacham | Matthew McCullough | Austin Ball | John Paul Chou | Oliver Fischer | Giovanni Marsella | Miriam Diamond | Erez Etzion | Antonio Policicchio | Liron Barak | Stefano Giagu | Barbara Liberti | Henry Lubatti | Yiftah Silver | Marco Schioppa | Rinaldo Santonico | S. A. Thayil | Gordon Watts | Yuekun Heng | Daniel Stolarski | Muge Karagoz | Cristiano Alpigiani | Yan Benhammo | Tingting Cao | Paolo Camarri | Mario Rodriguez-Cahuantzi | David Curtin | Giuseppe Di Sciascio | Marco Drewes | Sarah C. Eno | Rouven Essig | Jared Evans | Brandon Gomes | Giuseppe Iaselli | Ken Johns | Luke Kasper | Audrey Kvam | Dragoslav Lazic | David McKeen | Patrick Meade | Gilad Mizrachi | David Morrissey | Meny Raviv Moshe | Karen Salome Caballero-Mora | Piter A. Paye Mamani | Mason Proffitt | Marina Reggiani-Guzzo | Joe Rothberg | Jessie Shelton | Brian Shuve | Martin A. Subieta Vasquez | Albert de Roeck | Arturo Fernandez Tellez | Guillermo Tejeda Munoz | Mario Ivan Martinez Hernandez | Emma Torro | Yuhsin Tsai | Juan Carlos Arteaga-Velazquez | Charles Young | Jose Zurita | J. C. Arteaga-Velázquez | J. Chou | S. Giagu | L. Barak | P. Camarri | R. Cardarelli | E. Etzion | A. Haas | K. Johns | B. Liberti | H. Lubatti | A. Policicchio | R. Santonico | M. Schioppa | Y. Silver | G. Watts | T. Cao | G. Iaselli | A. Roeck | S. Eno | A. Ball | C. Alpigiani | J. Beacham | C. Young | Y. Heng | G. T. Muñoz | M. Diamond | A. Kvam | M. Proffitt | M. Karagoz | A. F. Tellez | Mario Iván Martínez Hernández | M. Vasquez | O. Fischer | D. Curtin | M. Drewes | B. Shuve | G. Sciascio | P. Meade | D. Stolarski | J. Zurita | M. McCullough | J. Shelton | R. Essig | Yuhsin Tsai | M. Rodríguez-Cahuantzi | M. Reggiani-Guzzo | D. Morrissey | G. Marsella | D. McKeen | G. Mizrachi | M. M. Moshe | Yan Benhammo | Liang Li | E. Torró | J. Rothberg | L. Kasper | J. Evans | D. Lazic | Brandon Gomes | Zhen Liu | Karen Salome Caballero-Mora | K. Johns | M. I. M. Hernández | G. Marsella | K. S. Caballero-Mora | James Beacham | M. Hernández

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