Negotiators for Anheuser-Busch and the Teamsters union have announced a tentative agreement, heading off a possible nationwide strike that would have included the company’s 73-year-old factory in Newark. The five-year agreement would significantly raise pay, improve health care and retirement benefits, and enhance job security, the union said in announcing the agreement Wednesday night. A ratification vote by the full membership is expected next week. The union’s current contract expires after 11:59 p.m. Thursday, after which approximately 5,000 employees — including nearly 200 in Newark — had…