A summit between U.S. President Donald Trump and China's Xi Jinping this month is unlikely to create room for even a limited reset of business and investment ties, five people briefed on preparations said. American business leaders at this stage have not secured the CEO delegation some had sought. On the other side, there is no indication Beijing is on track for the investment protections it has sought on behalf of Chinese companies.Washington and Beijing are looking to maintain the stability that has characterised relations between the world's two largest economies since late last year after a bruising period marked…