[RBRC seminar] Mechanical properties of hadrons via dispersion relations
by
2-160
https://bnl.zoomgov.com/j/1600983728?pwd=RAD7OLcqre7Ycsp6JfFp6HAnpyLxex.1
Quantum Chromodynamics (QCD) is the theoretical framework to study hadrons by means of their fundamental degrees of freedom, i.e. quarks and gluons, collectively referred to as partons. QCD defines many types of distributions describing a given hadron in terms of partons and, for the purposes of this talk, we are interested in the so-called generalized parton distributions (GPDs). These ones are off-forward matrix elements of parton operators whose convolutions with kernels describing the interactions at the partonic level are named Compton form factors (CFFs). Real and imaginary parts of CFFs are related by dispersion relations (DRs). At the lowest order approximation, DRs relate the CFFs (accessible in experiments of exclusive scattering) to the pressure inside the hadron. In a recent publication, we showed that by including kinematic power corrections (twist effects), DRs also allow to extract distributions of angular and linear momentum. These results bypass the calculation of moments of GPDs for accessing these properties, which typically requires either their modelling or lattice simulations; and conect the mechanical properties of hadrons to experimentally measurable quantities (the CFFs). In this talk, I will present my latest work in the topic after review of the concepts of exclusive scattering and twist.