On the Bispectra of Very Massive Tracers in the Effective Field Theory
  of Large-Scale Structure
  The Effective Field Theory of Large-Scale Structure (EFTofLSS) provides a
consistent perturbative framework for describing the statistical distribution
of cosmological large-scale structure. In a previous EFTofLSS calculation that
involved the one-loop power spectra and tree-level bispectra, it was shown that
the $k$-reach of the prediction for biased tracers is comparable for all
investigated masses if suitable higher-derivative biases, which are less
suppressed for more massive tracers, are added. However, it is possible that
the non-linear biases grow faster with tracer mass than the linear bias,
implying that loop contributions could be the leading correction to the
bispectra. To check this, we include the one-loop contributions in a fit to
numerical data in the limit of strongly enhanced higher-order biases. We show
that the resulting one-loop power spectra and higher-derivative plus leading
one-loop bispectra fit the two- and three-point functions respectively up to
$k\simeq 0.19\ h\ \rm{Mpc}^{-1}$ and $k\simeq 0.14\ h\ \rm{Mpc}^{-1}$ at the
percent level. We find that the higher-order bias coefficients are not strongly
enhanced, and we argue that the gain in perturbative reach due to the leading
one-loop contributions to the bispectra is relatively small. Thus, we conclude
that higher-derivative biases provide the leading correction to the bispectra
for tracers of a very wide range of masses.
