Disentangling spinning and nonspinning binary black hole populations with spin sorting

The individual component spins of binary black holes (BBH) are difficult to resolve using gravitational-wave observations but carry key signatures of the processes shaping their formation and evolution. Recent analyses have found conflicting evidence for a sub-population of black holes with negligible spin, but the Default spin magnitude population model used in LIGO-Virgo-KAGRA analyses cannot formally accommodate an excess of systems with zero spin. In this talk, we present an analysis of simulated BBH populations which shows that, despite this mismodeling, spinning and nonspinning populations can still be reliably distinguished when using the Default spin magnitude population model coupled with spin sorting. We will demonstrate that current BBH observations are inconsistent with a fully nonspinning population, but could be explained by a population with only one spinning black hole per binary or a population with up to 80% nonspinning sources.