Neutrino physics and the mirror world: how exact parity symmetry explains the solar neutrino deficit, the atmospheric neutrino anomaly and the LSND experiment

摘要

Evidence for $\bar \nu_{\mu} \rightarrow \bar \nu_e$ oscillations has beenreported at LAMPF using the LSND detector. Further evidence for neutrino mixingcomes from the solar neutrino deficit and the atmospheric neutrino anomaly. Allof these anomalies require new physics. We show that all of these anomalies canbe explained if the standard model is enlarged so that an unbroken paritysymmetry can be defined. This explanation holds independently of the actualmodel for neutrino masses. Thus, we argue that parity symmetry is not only abeautiful candidate for a symmetry beyond the standard model, but it can alsoexplain the known neutrino physics anomalies.