What is the Model Independent Expectation Value for QCD Vacuum?

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The discussion centers on understanding the Quantum Chromodynamics (QCD) vacuum and its model-independent expectation value. Participants seek foundational literature on the topic, highlighting a specific paper from arXiv as a valuable resource. The conversation mentions Peccei's role in introducing the Axion to address the strong CP problem linked to QCD vacuum structure. Additionally, Weinberg's Quantum Field Theory volume 2 is recommended for further insights. Overall, the thread emphasizes the complexity of the QCD vacuum and the need for accessible literature.
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How to understand QCD vacuum? What is the model independent expectation value for it? Looking for some basic literature on it.

Thanks in advance!
 
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
 
you could also try Weinberg's QFT vol 2
 

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