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We present cosmological constraints from the Dark Energy Survey (DES) using acombined analysis of angular clustering of red galaxies and theircross-correlation with weak gravitational lensing of background galaxies. Weuse a 139 square degree contiguous patch of DES data from the ScienceVerification (SV) period of observations. Using large scale measurements, weconstrain the matter density of the Universe as Omega_m = 0.31 +/- 0.09 and theclustering amplitude of the matter power spectrum as sigma_8 = 0.74 +/- 0.13after marginalizing over seven nuisance parameters and three additionalcosmological parameters. This translates into S_8 = sigma_8(Omega_m/0.3)^{0.16}= 0.74 +/- 0.12 for our fiducial lens redshift bin at 0.35 <z< 0.5, while S_8 =0.78 +/- 0.09 using two bins over the range 0.2 <z< 0.5. We study therobustness of the results under changes in the data vectors, modelling andsystematics treatment, including photometric redshift and shear calibrationuncertainties, and find consistency in the derived cosmological parameters. Weshow that our results are consistent with previous cosmological analyses fromDES and other data sets and conclude with a joint analysis of DES angularclustering and galaxy-galaxy lensing with Planck CMB data, Baryon AccousticOscillations and Supernova type Ia measurements.

Cosmology from large scale galaxy clustering and galaxy-galaxy lensing with Dark Energy Survey Science Verification data