Dark Energy Survey Year 1 Results: A Precise H0 Measurement from DES Y1,
  BAO, and D/H Data
  We combine Dark Energy Survey Year 1 clustering and weak lensing data with
Baryon Acoustic Oscillations (BAO) and Big Bang Nucleosynthesis (BBN)
experiments to constrain the Hubble constant. Assuming a flat $\Lambda$CDM
model with minimal neutrino mass ($\sum m_\nu = 0.06$ eV) we find
$H_0=67.2^{+1.2}_{-1.0}$ km/s/Mpc (68% CL). This result is completely
independent of Hubble constant measurements based on the distance ladder,
Cosmic Microwave Background (CMB) anisotropies (both temperature and
polarization), and strong lensing constraints. There are now five data sets
that: a) have no shared observational systematics; and b) each constrain the
Hubble constant with a few percent level precision. We compare these five
independent measurements, and find that, as a set, the differences between them
are significant at the $2.1\sigma$ level ($\chi^2/dof=20.1/11$, probability to
exceed=4%). This difference is low enough that we consider the data sets
statistically consistent with each other. The best fit Hubble constant obtained
by combining all five data sets is $H_0 = 69.1^{+0.4}_{-0.6}$ km/s/Mpc.
