[Hybrid RBRC Seminar] Quasi-parton distributions and Quasi-fragmentation functions in the massive Schwinger model

by Sebastian Grieninger (Stony Brook University)

Thursday 18 Jul 2024, 12:30 → 13:30 US/Eastern

2-160 ( https://bnl.zoomgov.com/j/1619458475?pwd=Z1VDdXVXcWF1eUhsRDZObVJnME4rUT09)

We analyze the quasi-parton distributions of the lightest meson in massive QED2.
For increasing rapidity, we compute the spatial quasi-parton
distribution functions and amplitude for the lowest excited state
numerically both at strong and weak coupling and compare them to light
front results in the lowest Fock space approximation.
Moreover, we introduce the concept of the quark quasi-fragmentation
function (qFF) using an equal-time and spatially boosted form of  the
Collins-Soper fragmentation function where the out-meson fragment is
replaced by the current asymptotic condition. In the massive Schwinger
model, we compute the qFF by exact diagonalization of the spin
Hamiltonian. Finally, we compare the results to the qFF following from
the Drell-Levy-Yan result for QED2 and to QCD2 in the lowest Fock
approximation.

Based on: arXiv:2406.01891 and arXiv:2404.05112