By ALANNA DURKIN RICHER, MARÍA VERZA and CHRISTOPHER SHERMAN WASHINGTON — Ismael “El Mayo” Zambada, a longtime leader of Mexico’s Sinaloa cartel, and Joaquín Guzmán López, a son of another infamous cartel leader, were arrested by U.S. authorities in Texas on Thursday, the U.S. Justice Department said. A leader of the powerful Sinaloa cartel for decades alongside Joaquín “El Chapo” Guzmán, Zambada is one of the most powerful drug traffickers in the world and known for running the cartel’s smuggling operations while keeping a lower profile. The U.S.