Neutrino Magnetic Moments: Status and Prospects

The strong evidence of neutrino oscillations from the solar, atmospheric and long baseline accelerator and reactor neutrino measurements implies finite neutrino masses and mixings[1,2]. Their physical origin and experimental consequences are not fully understood. Experimental studies on the neutrino properties and interactions can shed light to these fundamental questions and provide constraints to the interpretations in the future precision oscillation experiments. New and improved neutrino sources and detector technologies have to be developed in parallel for such studies. The couplings of neutrinos with the photons are generic consequences of finite neutrino masses, and are one of the important intrinsic neutrino properties[3] to explore. The neutrino electromagnetic vertex can be parametrized by terms with γη and σηξ corresponding to interactions without and with its spin, respectively identified as the “neutrino charge radius” and “neutrino magnetic moments”, the latter of which is the subject of this review .