Hadron and light nucleus radii from electron scattering*

Conceptually, radii are amongst the simplest Poincar\'e-invariant properties that can be associated with hadrons and light nuclei. Accurate values of these quantities necessary so one may judge character putative solutions to strong interaction problem within Standard Model. However, limiting their ability serve in this role, recent measurements new analyses older data have revealed uncertainties imprecisions proton, pion, kaon, deuteron. In context radius measurement using electron + hadron elastic scattering, past decade has shown reliable extraction requires complete elimination bias practitioner-dependent choices fitting functions. Different answers challenge been offered; perspective describes statistical Schlessinger point method (SPM), unifying applications deuteron radii. Grounded analytic function theory, independent assumptions about underlying dynamics, free from practitioner-induced bias, applicable same form diverse systems observables, SPM returns an objective expression information contained any under consideration. Its robust nature versatility make it suitable for use many branches experiment theory.