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One fundamental goal of the newly born gravitational wave astronomy isdiscovering the origin of the observed binary black hole mergers. Towards thisend, identifying features in the growing wealth of data may help indistinguishing different formation pathways. While large uncertainties stillaffect the binary formation models, spin-mass relations remain characteristicfeatures of specific classes of channels. By focusing on the effective inspiralspin $\chi_\text{eff}$, the best reconstructed spin-related merger parameter,we show that current GWTC-3 data support the hypothesis that a fraction ofevents may display mass-spin correlations similar to one expected by dynamicalformation channels of either astrophysical or primordial nature. We quantifythe Bayesian evidence in favour of those models, which are substantiallypreferred when compared to the Gaussian phenomenological model adopted todescribe the distribution of $\chi_\text{eff}$ in the recent LIGO/Virgo/KAGRApopulation analyses.

Searching for mass-spin correlations in the population of gravitational-wave events: the GWTC-3 case study