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We analyze the 2D correlation function of the SDSS-III Baryon OscillationSpectroscopic Survey (BOSS) CMASS sample of massive galaxies of the ninth datarelease to measure cosmic expansion H and the angular diameter distance D_A ata mean redshift of <z> = 0.57. We apply, for the first time, a new correlationfunction technique called clustering wedges. Using a physically motivatedmodel, the anisotropic baryonic acoustic feature in the galaxy sample isdetected at a significance level of 4.7 sigma compared to a featureless model.The baryonic acoustic feature is used to obtain model independent constraintscz/H/r_s = 12.28 +- 0.82 (6.7 per-cent accuracy) and D_A/r_s = 9.05 +- 0.27(3.0 per-cent) with a correlation coefficient of -0.5, where r_s is the soundhorizon scale at the end of the baryonic drag era. We conduct thorough tests onthe data and 600 simulated realizations, finding robustness of the resultsregardless of the details of the analysis method. Combining with r_sconstraints from the Cosmic Microwave Background we obtain H(0.57) = 90.8 +-6.2 kms-1Mpc-1 and D_A(0.57) = 1386 +- 45 Mpc. We use simulations to forecastresults of the final BOSS CMASS data set. We apply the reconstruction techniqueon the simulations demonstrating that the sharpening of the anisotropicbaryonic acoustic feature should improve the detection as well as tightenconstraints of H and D_A by 30 per-cent on average.

The Clustering of Galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Measuring H(z) and D_A(z) at z = 0.57 with Clustering Wedges