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Pion scalar, vector and tensor form factors from a contact interaction
- Publication Year :
- 2022
-
Abstract
- The pion scalar, vector and tensor form factors are calculated within a symmetry-preserving contact interaction model (CI) of quantum chromodynamics (QCD), encompassed within a Dyson-Schwinger and Bethe-Salpeter equations approach. In addition to the traditional rainbow-ladder truncation, a modified interaction kernel for the Bethe-Salpeter equation is adopted. The implemented kernel preserves the vector and axial-vector Ward-Takahashi identities, while also providing additional freedom. Consequently, new tensor structures are generated in the corresponding interaction vertices, shifting the location of the mass poles appearing in the quark-photon and quark tensor vertex and yielding a notorious improvement in the final results. Despite the simplicity of the CI, the computed form factors and radii are compatible with recent lattice QCD simulations.<br />Comment: 11 pages, 8 figures
- Subjects :
- High Energy Physics - Phenomenology
High Energy Physics - Lattice
Nuclear Theory
Subjects
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.2207.04339
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevD.106.054016