WordPress query args ignored.

        $wp_query=new WP_Query(
            array(
                "post_type"=>"post",
                'post_status'=>'publish',
                'cat'=>2,
                'category_name'=>'vendite',
                'category__not_in'=>9,
                'posts_per_page'=>$posts_per_page,
                'paged'=>get_query_var('paged')?get_query_var('paged'):1
            )
        );