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We study pair production of small BPS BH's in heterotic strings compactifiedon tori and in the FHSV model. After recalling the identification of small BH'sin the perturbative BPS spectrum, we compute the tree-level amplitudes forprocesses initiated by massless vector bosons or gravitons. We then analyze theresulting cross sections in terms of energy and angular distributions. Finally,we briefly comment on scenari with large extra dimensions and ongeneralizations of our results to non-BPS, non-extremal and rotating BH's.

Pair Production of small Black Holes in Heterotic String Theories