You'd think they'd know if they have a black hole or not. But apparently it's only speculation. BBC : Lab fireball 'may be black hole'. Or you can read the rather mathy paper, The RHIC fireball as a dual black hole.
I'm presuming it's not going to eat the earth up because in tiny fractions of a second it doesn't get big enough to be stable and thus flies appart when they turn off the juice.
Anyway, while we wait for the earth to collapse, there's a highly amusing Slashdot discussion of the alleged phenomenon.
They evaporate extremely quickly if they’re not of at least a certain size. I see that the /. article’s first commentor was the guy putting together the document on how to destroy the earth, Sam Hughes. I just yesterday included that my news headlines, suggesting that Bush and his neo-con friends would require at least a credible claim to be able to destroy the earth to hold on to power within a few years. It seems as if there’s actually good progress on their research.
whoops, not actually Sam Hughes, just somebody claiming to have him as one of his minions.