Ego--Datum and the Memory of a Vanished Source. Record Persistence in Quantum Pair Production

This paper introduces the notion of \emph{Record persistence}: the possibility that information concerning a physical object remains accessible after the disappearance of its original bearer. Photon conversion into an electron--positron pair provides the guiding example. Pair-conversion polarimetry shows that information about the linear polarization of incident radiation remains statistically accessible in the angular distributions of the resulting pairs. This motivates a distinction between individual and statistical Record persistence. A simple logical model illustrates how information may be instantiated relationally rather than in either component separately. The proposal extends the Ego--Datum notion of Record and suggests a relational interpretation of questions concerning information in quantum correlations.