Stau-catalyzed Nuclear Fusion

We point out that the stau τ̃ may play a role of a catalyst for nuclear fusions if the stau is a long-lived particle as in the scenario of gravitino dark matter. In this letter, we consider dd fusion under the influence of τ̃ where the fusion is enhanced because of a short distance between the two deuterons. We find that one chain of the dd fusion may release an energy of O(10) GeV per stau. We discuss problems of making the τ̃ -catalyzed nuclear fusion of practical use with the present technology of producing stau.