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SUMMARY:Exploring the lifetime frontier: the MATHUSLA detector proposal - 
 Cristiano Alpigiani (University of Washington)
DTSTART:20220426T150000Z
DTEND:20220426T160000Z
UID:TALK173261@talks.cam.ac.uk
CONTACT:William Fawcett
DESCRIPTION:The observation of neutral long-lived particles at the LHC wou
 ld reveal physics beyond the Standard Model and could account for the many
  open issues in our understanding of our universe. Long-lived particle sig
 natures are well motivated and can appear in many theoretical constructs t
 hat address the Hierarchy Problem\, Dark Matter\, Neutrino Masses\, and th
 e Baryon Asymmetry of the Universe.\nWith the current experiments at the p
 article accelerators\, no search strategy will be able to observe the deca
 y of neutral long-lived particles with masses above ∼GeV and lifetimes a
 t the limit set by Big Bang Nucleosynthesis (BBN)\, c*tau~10^7−10^8 m. T
 he MATHUSLA detector concept (MAssive Timing Hodoscope for Ultra-Stable ne
 utraL pArticles) will be presented. It can be implemented on the surface a
 bove the CMS detector in time for the high-luminosity LHC operations to se
 arch for neutral long-lived particles with lifetimes up to the BBN limit. 
 The large area of the detector allows MATHUSLA to make important contribut
 ions also to cosmic-ray physics. I will describe the basic detector concep
 t and layout\, the current status of the project\, the ongoing R&D and bac
 kground studies\, as well as the future plans. I will also report on the a
 nalysis of data collected by the test stand installed on the surface above
  the ATLAS detector in 2018.
LOCATION:Ryle Seminar Room
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