Searching for degenerate Higgs bosons - A profile likelihood ratio   method to test for mass-degenerate states in the presence of incomplete data   and uncertainties
  Using the likelihood ratio test statistic, we present a method which can be employed to test the hypothesis of a single Higgs boson using the matrix of measured signal strengths. This method can be applied in the presence of incomplete data and takes into account uncertainties on the measurements. The p-value against the hypothesis of a single Higgs boson is defined from the expected distribution of the test statistic, generated using pseudo-experiments. The applicability of the likelihood-based test is demonstrated using numerical examples with uncertainties and missing matrix elements. 
Andr\'e David, Jaana Heikkil\"a and Giovanni Petrucciani
hep-ph physics.data-an