Abstract
I describe a possible Forward Multiparticle Spectrometer (FMS) that could be installed downstream of the superconducting recombination dipole D1 in Run 4, from z = 96 m - 126 m to measure multi-TeV hadron spectra in low luminosity p + p collisions at Rt(s) = 14 TeV, as well as p + O and O + O collisions as relevant for cosmic ray showers. Light antinuclei and charmed hadrons at high Feynman xF can be measured, both of importance for astrophysics. At the full high luminosity HL-LHC a search for new long-lived neutral particles (LLPs) decaying in a 20 m long, 70 cm diameter vacuum pipe to visible decay modes (including gamma+gamma, e+e-, mu+mu-, tau+tau-, ccbar and jets) can be made. The FMS is especially well suited for LLPs with 1 GeV < M(X)< 10 GeV and lifetimes c.tau from about 10 m to several km. I discuss this as a possible addition to CMS but it has no formal approval yet, therefore the talk is not given on behalf of CMS.
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