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Interpretation of solar polarization spectra accounting for partial orcomplete frequency redistribution requires data on various collisionalprocesses. Data for depolarization and polarization transfer are needed butoften missing, while data for collisional broadening are usually more readilyavailable. Recent work by Sahal-Br\'echot and Bommier concluded that despiteunderlying similarities in the physics of collisional broadening anddepolarization processes, relationships between them are not possible to derivepurely analytically.  We aim to derive accurate numerical relationships between the collisionalbroadening rates and the collisional depolarization and polarization transferrates due to hydrogen atom collisions. Such relationships would enable accurateand efficient estimation of collisional data for solar applications.  Using earlier results for broadening and depolarization processes based ongeneral (i.e. not specific to a given atom), semi-classical calculationsemploying interaction potentials from perturbation theory, genetic programming(GP) has been used to fit the available data and generate analytical functionsdescribing the relationships between them. The predicted relationships from theGP-based model are compared with the original data to estimate the accuracy ofthe method.

A unified numerical model of collisional depolarization and broadening rates due to hydrogen atom collisions