* Had sought at least $8 billion for business * Will forge ahead with L.A. stadium plan By Ronald Grover and Soyoung Kim March 14 (Reuters) - U.S. billionaire Phil Anschutz has decided to retain ownership in Anschutz Entertainment Group and will terminate the sale process for the sports and entertainment empire, the company said on Thursday. As part of the decision, Dan Beckerman will become president and chief executive officer of AEG, replacing Tim Leiweke, who has been at the helm since 1996 and is leaving the company. AEG put the company up for sale on Sept. 19. ... More...