Search for dark matter

Physics – Nuclear Physics

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Scientific paper

The non-luminous matter which constitutes probably more than 90% of the mass of the universe cannot be any particle presently known to us in the Standard Model of particle physics. Significant experimental limits have already been set on a wide range of masses and interactions of proposed candidate dark matter particles: light neutrinos, axions, shadow matter, and weakly interacting massive particles (WIMPs) of both Majorana and Dirac types. Majorana WIMPs (Majorana neutrinos, sneutrinos, photrinos, higgsinos, zinos), as well as a small mass range of Dirac WIMPs, could accumulate in the sun, and high energy neutrinos from their annihilation products could be observed in proton decay detectors. These experiments eliminate sneutrinos and Majorana neutrinos between 10 and 20 GeV/c2. Other limits on these particles are set by direct detection through scattering off Ge or Si nuclei. In this way the UCSB/LBL/UCB/Saclay experiments limit Dirac neutrinos to the mass range 4-11 GeV/c2, Cosmions (which would also solve the solar neutrino problem) to 4-6 GeV/c2, and generally eliminate Dirac WIMPs between 11 GeV/c2 and 6 TeV/c2.

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