Sure. There's a bit of a difficulty in talking about direct experiments involving the vacuum, of course, because it's the vacuum... it's not like we can turn it on and off to see what changes! But we can calculate its expected effects from some theory and look for those. jal mentioned the Casimir effect, although I don't know that the QCD contribution has been seen there. Interactions with the QCD vacuum are what cause the "running" of the strong coupling constants -- that is, the strong interactions becomes weaker as you increase the energy of your experiment. This has been observed experimentally, and matches theoretical predictions of the effect of the vacuum.damgo!
I do not like to argue about faith and opinions.
Do you have some other facts to present that we can discuss.
You said only, "typically called the QCD vacuum".
Have you got an experiment that can be discussed?
In the limit of very high energies we get something called "asymptotic freedom", where the objects inside the proton seem to be just 'floating freely' around in it (not bound at all) if you hit them hard enough. This effect is also seen, and the small corrections to it also match predictions.
see, eg http://courses.washington.edu/phys55x/558Hwi_03_soln.htm [Broken] and http://www.nikhef.nl/pub/experiments/zeus/theses/wouter_verkerke/latex2html/node8.html
(esp http://courses.washington.edu/phys55x/558Hwi_03_soln_files/image098.jpg [Broken] and http://www.nikhef.nl/pub/experiments/zeus/theses/wouter_verkerke/latex2html/img123.gif )
Those two articles you mentionned don't change our understanding of the standard model... They are all about understanding the kinds of things we're talking about, how the nuclear environment behaves and how to calculate various properties of the nucleus.
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