2023/12/22 by J. M. Flynn, Andreas Jüttner, Flynn, J. M. +3
Physics and Astronomy · Medicine · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Medical Imaging Techniques and Applications
paper · pdf · doi:10.48550/arxiv.2312.14631
We discuss our recently proposed model-independent framework for fitting hadronic form-factor data, which are often only available at discrete kinematical points, using parameterisations based on unitarity and analyticity. The accompanying dispersive bound on the form factors (unitarity constraint) is used to regulate the ill-posed fitting problem and allow model-independent predictions over the entire physical range. Kinematical constraints, for example for the vector and scalar form factors in semileptonic meson decays, can be imposed exactly. The core formulae are straight-forward to implement with standard math libraries. We demonstrate the method for the exclusive semileptonic decay Bs→ Kℓν, an example requiring one to use a generalisation of the original Boyd Grinstein Lebed (BGL) unitarity constraint. We further present a first application of the method to B → D^*ℓ ν decays.