The clustering of galaxies in the SDSS-III Baryon Oscillation
  Spectroscopic Survey: Signs of neutrino mass in current cosmological datasets
  We investigate the cosmological implications of the latest growth of
structure measurement from the Baryon Oscillation Spectroscopic Survey (BOSS)
CMASS Data Release 11 with particular focus on the sum of the neutrino masses,
$\sum m_{\nu}$. We examine the robustness of the cosmological constraints from
the Baryon Acoustic Oscillation (BAO) scale, the Alcock-Paczynski effect and
redshift-space distortions ($D_V/r_s$, $F_{\rm AP}$, $f\sigma_8$) of
\citet{Beutler:2013b}, when introducing a neutrino mass in the power spectrum
template. We then discuss how the neutrino mass relaxes discrepancies between
the Cosmic Microwave Background (CMB) and other low-redshift measurements
within $\Lambda$CDM. Combining our cosmological constraints with WMAP9 yields
$\sum m_{\nu} = 0.36\pm0.14\,$eV ($68\%$ c.l.), which represents a $2.6\sigma$
preference for non-zero neutrino mass. The significance can be increased to
$3.3\sigma$ when including weak lensing results and other BAO constraints,
yielding $\sum m_{\nu} = 0.35\pm0.10\,$eV ($68\%$ c.l.). However, combining
CMASS with Planck data reduces the preference for neutrino mass to $\sim
2\sigma$. When removing the CMB lensing effect in the Planck temperature power
spectrum (by marginalising over $A_{\rm L}$), we see shifts of $\sim 1\sigma$
in $\sigma_8$ and $\Omega_m$, which have a significant effect on the neutrino
mass constraints. In case of CMASS plus Planck without the $A_{\rm L}$-lensing
signal, we find a preference for a neutrino mass of $\sum m_{\nu} = 0.34\pm
0.14\,$eV ($68\%$ c.l.), in excellent agreement with the WMAP9+CMASS value. The
constraint can be tightened to $3.4\sigma$ yielding $\sum m_{\nu} = 0.36\pm
0.10\,$eV ($68\%$ c.l.) when weak lensing data and other BAO constraints are
included.
