Aug 19 (Reuters) - ** Shares in Brazilian sugarcane processor Raizen RAIZ4.SA fall after state-run Petrobras PETR4.SA said it has no planned investments in ethanol production or distribution with Raizen
** Raizen shares had soared on Monday following a weekend report from newspaper O Globo saying Petrobras was exploring investment opportunities with the sugar and ethanol producer
** Shares in Raizen are down more than 7% in Sao Paulo morning trading, after a 10.6% jump the previous day
** The company is a joint venture between Cosan CSAN3.SA and Shell SHEL.L
** Raizen is the worst performer on Brazil's Bovespa stock index .BVSP, which is down 1.5%
** Year-to-date, Raizen's shares slip more than 50%
(Reporting by Fernando Cardoso; Editing by Gabriel Araujo)
((fernando.cardoso@thomsonreuters.com;))