Context :

Aims : We wish to determine the distribution of dark matter halo masses as a function of the stellar mass and the stellar mass profile , for massive galaxies in the BOSS CMASS sample .

Methods : We use grizy photometry from HSC to obtain Sérsic fits and stellar masses of CMASS galaxies for which HSC weak lensing data is available , visually selected to have spheroidal morphology .
We apply a cut in stellar mass , \log { M _ { * } / M _ { \odot } } > 11.0 , selecting \sim 10 , 000 objects .
Using a Bayesian hierarchical inference method , we first investigate the distribution of Sérsic index and size as a function of stellar mass .
Then , making use of shear measurements from HSC , we measure the distribution of halo mass as a function of stellar mass , size and Sérsic index .

Results : Our data reveals a steep stellar mass-size relation R _ { e } \propto M _ { * } ^ { \beta _ { R } } , with \beta _ { R } larger than unity , and a positive correlation between Sérsic index and stellar mass : n \propto M _ { * } ^ { 0.46 } .
Halo mass scales approximately with the 1.7 power of the stellar mass .
We do not find evidence for an additional dependence of halo mass on size or Sérsic index at fixed stellar mass .

Conclusions : Our results disfavour galaxy evolution models that predict significant differences in the size growth efficiency of galaxies living in low and high mass halos .