Assist. Prof. Dr. Miha Mihovilovič (FMF, IJS): Still shrinking? The unsolved problem of the proton's size

The discrepancy between the proton charge radius determined by Lamb shift measurements in muonic hydrogen and the value obtained from elastic scattering has put decades of experimental data under intense scrutiny --- and even called into question our understanding of quantum electrodynamics.
Driven to resolve this "proton radius puzzle", researchers over the past decade have launched a series of high-precision experiments, complemented by extensive theoretical work. These efforts have examined in detail the processes affecting the Lamb shift measurements and explored new ways to interpret form-factor data from scattering experiments.
Yet, in spite of 15 years of focused investigation and several claims of resolution, the mystery remains unsolved. In this talk I will discuss the latest experimental approaches, their challenges and setbacks, and how these studies impact broader areas of nuclear physics --- particularly neutrino-related research.
Cookies, tea