S. Leupold

activity

20242026

collaborators

3 papers

hep-ph2026

Dispersive Analysis of $D$ - and $B$ -Meson Form Factors with Chiral and Heavy-Quark Constraints

Simon Mutke, Leon A. Heuser, Ingrid Dax +2

We analyze the isovector vector form factors of $D$ , $D^{*}$ , $B$ , and $B^{*}$ mesons at low energies. We employ all constraints due to chiral and heavy-quark symmetry, and include the…

hep-ph2025

Kinetic Mixing and Axial Charges in the Parity-Doublet Model

Christian Kummer, Stefan Leupold, Lorenz von Smekal

The standard parity doublet model with its mass-mixing mechanism fails to describe the axial charge $g_{A}$ of the nucleon. While $g_{A} = 1$ in the original Gell-Mann--Levy model, whi…

nucl-th2024

Electromagnetic isovector form factors of the transition from the $N^{*} (1520)$ to the nucleon

Di An, Stefan Leupold

Dispersion theory is used to provide a model-independent low-energy representation of the three electromagnetic isovector transition form factors $N^{*} (1520) \to N$ . At low energie…

Dispersive Analysis of D- and B-Meson Form Factors with Chiral and Heavy-Quark Constraints

Kinetic Mixing and Axial Charges in the Parity-Doublet Model

Electromagnetic isovector form factors of the transition from the N∗(1520) to the nucleon

Dispersive Analysis of $D$ - and $B$ -Meson Form Factors with Chiral and Heavy-Quark Constraints

Electromagnetic isovector form factors of the transition from the $N^{*} (1520)$ to the nucleon