Type I and new seesaw in left–right symmetric theories

摘要

We extend the Type I seesaw and suggest anewseesaw mechanism to generate neutrino masses within the left–right symmetric theories where parity is spontaneously broken. We construct a next to minimal left–right symmetric model where neutrino masses are determined irrespective of theB?Lbreaking scale and call it thenewseesaw mechanism. In this scenarioB?Lscale can be very low. This makesB?Lgauge boson and the quasi-Diracheavyleptons very light. These TeV scale particles could have large impact on lepton flavor and CP violating processes. We also shed light on the phenomenological aspects of the model within the reach of the LHC.