PRODUCTION, COLLECTION, AND UTILIZATION OF VERY LONG-LIVED HEAVY CHARGED LEPTONS

If a fourth generation of leptons exists, both the neutrino and its ch arged partner must be heavier than 45 GeV. We suppose that the neutrin o is the heavier of the two, and that a global or discrete symmetry pr ohibits intergenerational mixing. In that case, nonrenormalizable Plan ck scale interactions will induce a very small mixing; dimension-five interactions will lead to a lifetime for the heavy charged lepton simi lar to (1 - 100) yr. Production of such particles is discussed, and it is shown that a few thousand can be produced and collected at a linea r collider. The possible uses of these heavy leptons are also briefly discussed.