In the paper in equations 4 and 5, some of the mass of the nucleons comes from the "trace anomaly" of the QCD energy-momentum tensor (as described in the paragraph following these equations). Is there a simple physical interpretation of where this mass comes from? Such as the other contributions coming from quark mass and Parton kinetic energy.
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$\begingroup$ Please type out the specific equations you are referring to. Links can change with time and become useless. $\endgroup$– flaudemusCommented Mar 20, 2019 at 16:58
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2$\begingroup$ The paper makes ample references to the trace anomaly. It is the piece "purely" due to QM, which vanishes as $\hbar \to 0$, so it is due to glue and its quantum interactions and fluctuations. It is at the heart of the RG. Have you read up on the trace anomaly? $\endgroup$– Cosmas ZachosCommented Mar 20, 2019 at 19:35
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