FinanceChevron and Hess eye Guyana arbitration finale by year-endUS producers fighting with ExxonMobil and CNOOC International over prolific Stabroek blockHopes: Hess chief executive John Hess (left) and Chevron chief executive Mike WirthPhoto: REUTERS/SCANPIXRobert StewartNorth America Energy CorrespondentBaton Rouge