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We present a detection of the Sunyaev-Zel'dovich (SZ) decrement associatedwith the Luminous Red Galaxy (LRG) sample of the Sloan Digital Sky Survey. TheSZ data come from 148 GHz maps of the equatorial region made by the AtacamaCosmology Telescope (ACT). The LRG sample is divided by luminosity into fourbins, and estimates for the central Sunyaev-Zel'dovich temperature decrementare calculated through a stacking process. We detect and account for a bias ofthe SZ signal due to weak radio sources. We use numerical simulations to relatethe observed decrement to Y200 and clustering properties to relate the galaxyluminosity bins to mass. We also use a relation between brightest clustergalaxy luminosity and cluster mass based on stacked gravitational lensingmeasurements to estimate the characteristic halo masses. The masses are foundto be around 1e14 M_sun.

The Atacama Cosmology Telescope: Detection of Sunyaev-Zel'dovich Decrement in Groups and Clusters Associated with Luminous Red Galaxies