Carlyle Group LP, one of the world’s largest private equity investors, has hired banks for an initial public offering of Ortho Clinical Diagnostics Inc., according to people with knowledge of the matter. Washington-based Carlyle is working with Goldman Sachs Group Inc., Barclays Plc and JPMorgan Chase & Co. on the planned listing, which could value Ortho Clinical at as much as $7 billion including debt, said the people, who asked not to be identified because they weren’t authorized to speak publicly.