  In this paper, we evaluate the lifetime of the light stringy states that
emerge in intersecting D-brane realisations of the Standard Model. For
concreteness, we focus on a light massive scalar decaying into two massless
fermions. Given the present experimental lower bounds of the string scale, we
extrapolate the lifetime as a function of the intersection angles to very small
angles in order to have states with lifetimes of the order of the universe.
That provides an alluring example of a massive, very weakly interacting field
with a huge lifetime, proposing itself as a potential dark matter candidate.
