  The imperfect knowledge of the Higgs boson decay rates and cross sections at
the LHC constitutes a critical systematic uncertainty in the study of the Higgs
boson properties. We show that the full covariance matrix between the Higgs
rates can be determined from the most elementary sources of uncertainty by a
direct application of probability theory. We evaluate the error magnitudes and
full correlation matrix on the set of Higgs cross sections and branching ratios
at $\sqrt{s}=7$, $8$, $13$ and $14$ TeV, which are provided in ancillary files.
The impact of this correlation matrix on the global fits is illustrated with
the latest $7$+$8$ TeV Higgs dataset.

High Energy Physics - Phenomenology