Jim Higgins, a managing director and New York-based head of the high-yield trading desk at Salomon Smith Barney, has moved to London, according to a buy-side trader and a trader at a rival firm who have spoken to people on Salomon's desk. The reason for the move could not be determined, nor could it be determined who would replace Higgins, or what his new responsibilities will be. Higgins could not be reached, according to a trader on the desk who declined to give his name. Mark Mulcahy, a senior high-yield trader on the desk, declined comment. Dan Noonan, a firm spokesman, was not available for comment shortly before press time.