10-12 April 2019
Denver, CO
US/Mountain timezone
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Contribution contributed talk

Denver, CO - Director's Row I

Quark and gluon contributions to the proton mass and spin


  • Abha RAJAN

Primary authors


The Mellin moments of Generalized Parton Distributions connect to quantities that describe the QCD energy momentum tensor. They allow us to single out the separate contributions from quarks and gluons. Partonic orbital angular momentum (OAM) plays a key role in our understanding of the long standing proton spin puzzle. Our recent work demonstrates the connection between quark gluon interactions and intrinsic kT relevant for describing OAM. The QCD trace anomaly is crucial for understanding the origin of hadron mass. Although the total energy momentum tensor is a conserved quantity, the separate contributions from quarks and gluons are not and hence are renormalization scale dependent. By studying the correct connection of the trace anomaly to the quark and gluon gravitational form factors, we can estimate the size of these contributions and even connect to experimental observables.