It is Kali, the supreme goddess of death, dancing on Shiva’s corpse.
She is worshipped because she brings Moksha; eternal oblivion.
Since both personal experience (to include living for a time in India) and research (Internet and otherwise) informs that the CERN statue is of Shiva (along with the attestation by the Indian Government to that fact as cited in the link), can you provide a source (with image) for your assertion it is, in fact, a statue of Kali?