  We present a simple and efficient phenomenological model for the
two-dimensional two-point galaxy correlation function that works well over a
wide range of scales, from large scales down to scales as small as 25Mpc/h. Our
model incorporates nonlinear effects, a scale-dependent galaxy bias on small
scales, and allows the redshift-space distortions to be scale and direction
dependent. We validate our model using LasDamas mock catalogs, and apply it to
the Sloan Digital Sky Survey (SDSS) DR7 Luminous Red Galaxies (LRGs). Using
only the monopole and quadrupole of the correlation function measured from the
SDSS DR7 LRGs, we obtain improved measurements H(z)r_s(z_d)/c=0.0433\pm 0.0042,
D_A(z)/r_s(z_d)=6.59\pm 0.46, and f(z)sigma_8(z)=0.429\pm 0.089 at z=0.35,
using the scale range of 25<s<120Mpc/h. We expect our results and model to be
useful in tightening dark energy and gravity constraints from the full analysis
of current and future galaxy clustering data.
