By Chris Prentice and Dhara Ranasinghe WASHINGTON/LONDON (Reuters) -World stocks rose to a five-week peak on Wednesday in choppy trading as U.S. shares were mixed, with investors weighing disappointing earnings from U.S. heavyweights with hopes the Federal Reserve will slow its aggressive pace of interest rate hikes. The U.S. dollar index fell to a five-week low as the pound touched its highest since Sept. 13, continuing its rally after Rishi Sunak became Britain’s prime minister. News that the British government’s plan to repair the country’s public finances will be delayed by more than two w…