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arXiv · 2009.02839

QCD vacuum and baryon masses

Youngman Kim·Igor A. Mazur·Masayasu Harada·Hyun Kyu Lee
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Abstract

To study a possible role of the quantum chromodynamics (QCD) vacuum in nuclear and hadron physics, we evaluate a physical quantity in a candidate of the QCD vacuum. In this study we adopt the Copenhagen (spaghetti) picture of the QCD vacuum and calculate the ground-state baryon masses in a constituent quark model. We find that the calculated baryon mass does depend on a parameter that characterizes the Copenhagen picture of the QCD vacuum and satisfies the Gell-Mann-Okubo mass relation for the baryon octet. We also observe that the effective constituent quark mass defined in this study contains a contribution attributed to the Copenhagen vacuum, that is the gluon background field. We then estimate the value of the background gluon field as a function of the up (down) constituent quark mass by using the baryon masses as inputs.

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Youngman Kim, Igor A. Mazur, Masayasu Harada, Hyun Kyu Lee. 2020-09-07. QCD vacuum and baryon masses. https://arxiv.org/abs/2009.02839

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