breaking a research treaty

Only one way. WAR

Well, you could also load the last save before the treaty.

Note that when you give a race a treaty (economic or research) you do not lose anything. The 10% is not subtracted from your treasury/labs, just shared. Also, when you start a war against a race with which you have a treaty, a permanent "-" is added to every other race's view of your civ. That is to say, the other races will look unfavorably upon that action and that view will never change. That being said, if the race with which you have a treaty declares war on you, then there is no such penalty assessed. In other words, try tickin off the Drengin