The Monopole & Exotics Detector at the LHC

The LHC is opening up a new energy regime in which we can search for new physics beyond the Standard Model. The search strategy for exotics planned for the main LHC detectors can be extended with dedicated experiments designed to enhance, in a complementary way, the physics reach of the LHC. The MoEDAL (Monopole and Exotics Detector at the LHC) project is such an experiment. The prime motivation of MoEDAL is to directly search for the Magnetic Monopole or Dyon and other highly ionizing Stable (or pseudo-stable) Massive Particles (SMPs) at the LHC.

MoEDAL  Nuclear Track Detectors (NTDs) will be able to record the tracks of highly ionizing particles with magnetic/electric charges greater than 3gD (≡ 206e), the detection of even one magnetic monopole or dyon that fully penetrated a MoEDAL NTD stack is  expected to be distinctive.

Another important area of physics beyond the Standard Model that can be addressed by MoEDAL is the existence of SMPs with single electrical charge which provide a second category of particle that is heavily ionizing by virtue of its small speed. The most obvious possibility for an SMP is that one or more new states exist which carry a new conserved, or almost conserved, global quantum number.  For example, SUSY with R-parity, extra dimensions with KK-parity, and several other models fall into this category. The lightest of the new states will be stable, due to the conservation of this new parity, and depending on quantum numbers, mass spectra, and interaction strengths, one or more higher-lying states may also be stable or meta-stable.

The third class of SMP which could be accessed by MoEDAL  has multiple electric charge such as the black hole remnant, or long-lived doubly charged Higgs bosons.  SMPs with magnetic charge, single or multiple electric charge and with Z/β (β=v/c)  as low as five can, in principle, be detected by the CR39 nuclear track detectors, putting them within the physics reach of  MoEDAL.