Theorists suggest that WIMPs are anywhere from 40 to 1,000 times as
massive as protons.
The particles, named DS3 * (2860)-- and DS1 * (2860)-- , are about three times as
massive as protons (arxiv.org/abs/1407.7574 and arxiv.org/abs/1407.7712).
Not exact matches
All told, ISS - CREAM can distinguish electrons,
protons and atomic nuclei
as massive as iron
as they crash through the instruments.
They are known
as WIMPs (for weakly interacting
massive particles), and if they exist, these particles have masses tens or hundreds of times greater than that of a
proton but interact so weakly with ordinary matter that they're difficult to detect.