Towards the time-like pion form factor beyond the elastic regime using domain-wall QCD
Abstract
In this work, we investigate the time-like pion form factor from lattice QCD in the isosymmetric limit, a quantity that plays an important role in understanding hadron physics with substantial phenomenological applications. This observable can be calculated in the elastic region using the finite-volume approach, up to the first (four-particle) open channel. With the goal of accessing the exclusive two-pion form factor in the inelastic region, starting from a three-point correlator involving the vector current and two (temporally-displaced) pion interpolating operators, we examine the associated underlying spectral density and calculate the form factor using a formalism based on the LSZ reduction. A preliminary analysis on one ensemble generated by the RBC/UKQCD collaboration using domain-wall fermions is presented.
Cite
@article{arxiv.2603.04094,
title = {Towards the time-like pion form factor beyond the elastic regime using domain-wall QCD},
author = {Gabriele Morandi and Mattia Bruno and Francesca Argia Bresciani and Christoph Lehner and Julian Parrino},
journal= {arXiv preprint arXiv:2603.04094},
year = {2026}
}
Comments
10 pages, 3 figures, Proceedings of The 42nd International Symposium on Lattice Field Theory (Lattice 2025), 2-8 November 2025, Tata Institute of Fundamental Research, Mumbai, India