Speaker
Description
The talk reviews two dosens of works during 2020's, with I.Zahed and students.
At the spectroscopy side we develop novel methods to derive wave functions
of multiquark hadrons with Fermi statistics,
based on representations of permutation groups Sn. Particularly
I will discuss pentaquarks and their admixture to nucleons, which are central to the
spin puzzle and antiquark PDFs. We also gradually developed hadronic spectroscopy on the
light cone, from mesons and baryons to tetra and pentaquarks.
We solve natural Hamiltonians using Jacobi coordinates, and get LC wave functions, from
which PDFs, GPDs and formfactors are consistently calculated. We argue that description
at resolution scale $\mu\sim 1 \, GeV$ is common, both from below by spectroscopic models
and from above by gluonic evolution.