I am reading through http://cerncourier.com/cws/article/cern/29662" [Broken] article for a paper and ran across the term transversity. I did some google searching but didn't come up with anything I could understand. I think it might be linked with transverse spin but I am also having trouble getting clarification on what that is. I know what spin is, and I'm wondering if it's just spin along a latitude instead of a longitude. My ultimate goal is to be able to explain what these guys are doing on the COMPASS project. I understand their aim is to try to solve the "proton spin crisis" and I have a pretty good understanding of what that is from some other articles I've read. So if you happen to have knowledge of that experiment as well as transversity and transverse spin, I'd really appreciate it.