Black hole production and Large Extra Dimensions

Black hole (BH) production at colliders is possible when the colliding energy is above the Planck scale, which can effectively be at TeV scale in models of large extra dimensions. In this work, we study the production of black holes at colliders and discuss the possible signatures. We point out the ``$ij\to {\rm BH}+$ others'' subprocesses, in which the BH and other SM particles are produced with a large transverse momentum. When the BH decays, it gives a signature that consists of particles of high multiplicity in a boosted spherical shape on one side of the event and a few number of high $p_T$ partons on the other side, which provide very useful tags for the event.