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Re:LHCb experiment reports observation of exotic pentaquark ... by betatim on Tuesday July 14, 2015 @04:55AM (#9883585)
A little history on previous pentaquark discoveries http://link.springer.com/article/10.1140%2Fepjh%2Fe2012-2003...
Re:LHCb experiment reports observation of exotic pentaquark ... by jcr on Tuesday July 14, 2015 @05:35AM (#9883709)
Unfortunately, that paper is pay-walled by springer.com.

On the bright side, the author of that paper, Kenneth H. Hicks, has provided three different explanations of pentaquarks here:

http://plato.phy.ohiou.edu/~hicks/thplus.html

They are a bit dated due to the news today, but they're helpful.