What is the Model Independent Expectation Value for QCD Vacuum?

[Naeem Anwar]

How to understand QCD vacuum? What is the model independent expectation value for it? Looking for some basic literature on it.

Thanks in advance!

 

[Sleuth]

The question is a bit vague to me, but for example a place where a discussion on the QCD vacuum can be found is:

http://arxiv.org/pdf/hep-ph/0607268.pdf

Peccei was one of the "inventors" of the Axion in order to provide a solution of the so called strong CP problem, which arises precisely due to the structure of the QCD vacuum.

I hope this helps

Sleuth

 

[ChrisVer]

you could also try Weinberg's QFT vol 2