Authorities in Bergen County have charged a former band teacher with additional counts of sexual assault after an investigation alleged he had sexual contact with a second student in a separate school district, Bergen County Prosecutor Mark Musella said Thursday. Kurt Zimmermann, 55, of Rockaway Township was arrested and charged with three counts of second-degree sexual assault Wednesday regarding alleged sexual contact with a student while teaching in the Morris Hills Regional School District. The additional charges are the result of an investigation earlier this year that accused Zimmermann …