The large-scale 3-point correlation function of the SDSS BOSS DR12 CMASS
  galaxies
  We report a measurement of the large-scale 3-point correlation function of
galaxies using the largest dataset for this purpose to date, 777, 202 Luminous
Red Galaxies in the Sloan Digital Sky Survey Baryon Acoustic Oscillation
Spectroscopic Survey (SDSS BOSS) DR12 CMASS sample. This work exploits the
novel algorithm of Slepian & Eisenstein (2015b) to compute the multipole
moments of the 3PCF in $\mathcal{O}(N^2)$ time, with $N$ the number of
galaxies. Leading-order perturbation theory models the data well in a
compressed basis where one triangle side is integrated out. We also present an
accurate and computationally efficient means of estimating the covariance
matrix. With these techniques the redshift-space linear and non-linear bias are
measured, with 2.6% precision on the former if $\sigma_8$ is fixed. The data
also indicates a $2.8\sigma$ preference for the BAO, confirming the presence of
BAO in the 3-point function.
