NEW YORK/TORONTO (Reuters) – UBS AG has poached a U.S. team of some 15 oil and gas investment bankers from Bank of Montreal (BMO), significantly weakening the energy dealmaking capacity at Canada’s fourth-largest bank, people familiar with the matter said. The moves come amid plummeting oil prices that have prompted banks to try to lure talented energy bankers with deep technical expertise. Such bankers can help them win new investment banking business from companies that want to shed assets.