The question of federal court jurisdiction over arbitration proceedings has historically led to different conclusions. A few years ago, the  United States Supreme Court clarified in Vaden v. Discover Bank that Section 4 of the Federal Arbitration Act (“FAA”) authorizes a federal court to “look through” to the underlying controversy to determine if there is federal court jurisdiction to adjudicate a motion compelling arbitration. Until recently, however, the “look through” approach had not been adopted by the Second Circuit for determining whether a federal court has jurisdiction to hear a motion to vacate an arbitration award.