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The DMASS sample is a photometric sample from the DES Year 1 data setdesigned to replicate the properties of the CMASS sample from BOSS, in supportof a joint analysis of DES and BOSS beyond the small overlapping area. In thispaper, we present the measurement of galaxy-galaxy lensing using the DMASSsample as gravitational lenses in the DES Y1 imaging data. We test a number ofpotential systematics that can bias the galaxy-galaxy lensing signal, includingthose from shear estimation, photometric redshifts, and observing conditions.After careful systematic tests, we obtain a highly significant detection of thegalaxy-galaxy lensing signal, with total $S/N=25.7$. With the measured signal,we assess the feasibility of using DMASS as gravitational lenses equivalent toCMASS, by estimating the galaxy-matter cross-correlation coefficient $r_{\rmcc}$. By jointly fitting the galaxy-galaxy lensing measurement with the galaxyclustering measurement from CMASS, we obtain $r_{\rm cc}=1.09^{+0.12}_{-0.11}$for the scale cut of $4~h^{-1}{\rm Mpc}$ and $r_{\rm cc}=1.06^{+0.13}_{-0.12}$for $12~h^{-1}{\rm Mpc}$ in fixed cosmology. By adding the angular galaxyclustering of DMASS, we obtain $r_{\rm cc}=1.06\pm 0.10$ for the scale cut of$4~h^{-1}{\rm Mpc}$ and $r_{\rm cc}=1.03\pm 0.11$ for $12~h^{-1}{\rm Mpc}$. Theresulting values of $r_{\rm cc}$ indicate that the lensing signal of DMASS isstatistically consistent with the one that would have been measured if CMASShad populated the DES region within the given statistical uncertainty. Themeasurement of galaxy-galaxy lensing presented in this paper will serve as partof the data vector for the forthcoming cosmology analysis in preparation.

Galaxy-galaxy lensing with the DES-CMASS catalogue: measurement and constraints on the galaxy-matter cross-correlation