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Measuring the total neutrino mass is one of the most exciting opportunitiesavailable with next-generation cosmological data sets. We study the possibilityof detecting the total neutrino mass using large-scale clustering in 21cmintensity mapping and photometric galaxy surveys, together with CMBinformation. We include the scale-dependent halo bias contribution due to thepresence of massive neutrinos, and use a multi-tracer analysis in order toreduce cosmic variance. The multi-tracer combination of an SKAO-MID 21cmintensity map with Stage~4 CMB dramatically shrinks the uncertainty on totalneutrino mass to $\sigma(M_\nu) \simeq 45\,$meV, using only linear clusteringinformation ($k_{\rm max} = 0.1\, h/$Mpc) and without a prior on optical depth.When we add to the multi-tracer the clustering information expected from LSST,the forecast is $\sigma(M_\nu) \simeq 12\,$meV.

Constraining the neutrino mass using a multi-tracer combination of two galaxy surveys and CMB lensing