For almost 3 decades the study of the spin of the proton and its
decomposition in terms of the spin and motion of its basic
constituents, quarks and gluons, has taken center stage and generated
many fruitful past and present experimental programs of nucleon spin
structure worldwide. Along the way a paradigm shift in the way
nucleon structure is viewed has emerged in attempting to access all
the pieces of the proton spin decomposition, namely through the window
of Wigner distributions that encapsulate the information of nucleon
In contrast, the "mass decomposition of the proton" in terms of its constituents and their dynamics has not received as much attention from the hadron/nuclear physics community. Although one of the outstanding successes of lattice QCD is to reproduce the baryon mass spectrum, it doesn’t lend itself to communicating to a general audience a deeper understanding of how the different parts contribute to the whole.
In an effort to explore the fundamental importance and meaning of the "proton mass decomposition" in terms of the confined motion of the constituents we would like to organize an intensive 2-day workshop with enough time for discussions. The expected outcome of this workshop is a path forward to organize a week long workshop at the Institute of Nuclear Theory where a wider group of theorists and experimentalists will define a platform where experimental proposals to laboratories like Jefferson Lab and the future Electron Ion Collider will be put forward.
In this workshop we would like to discuss and address the following questions: