# Combined measurement of the Higgs Boson mass in pp collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS and CMS experiments

This is a condensed description with plots for the analysis CERN-PH-EP-2015-075 ; CMS-HIG-14-042, arXiv:1503.07589.

## Abstract

A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the H → γγ and H → ZZ → 4ℓ decay channels. The results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. The measured masses from the individual channels and the two experiments are found to be consistent among themselves. The combined measured mass of the Higgs boson is mH = 125.09 $\pm$ 0.21 (stat.) $\pm$ 0.11 (syst.) GeV.

## Figures from the paper

 Figure 1:Scans of twice the negative log-likelihood ratio -2lnΛ(mH) as functions of the Higgs boson mass mH for the ATLAS and CMS combination of the H → γγ (red), H → ZZ → 4ℓ (blue), and combined (black) channels. The dashed curves show the results accounting for statistical uncertainties only, with all nuisance parameters associated with systematic uncertainties fixed to their best-fit values. The 1 and 2 standard deviation limits are indicated by the intersections of the horizontal lines at 1 and 4, respectively, with the log-likelihood scan curves. png (160kB), eps (16kB), pdf (21kB) Figure 2:Summary of Higgs boson mass measurements from the individual analyses of ATLAS and CMS and from the combined analysis presented here. The systematic (narrower, magenta-shaded bands), statistical (wider, yellow-shaded bands), and total (black error bars) uncertainties are indicated. The (red) vertical line and corresponding (gray) shaded column indicate the central value and the total uncertainty of the combined measurement, respectively. png (103kB), eps (20kB), pdf (48kB) Figure 3:The impacts δmH (see text) of the nuisance parameter groups in Table 1 on the ATLAS (left), CMS (center), and combined (right) mass measurement uncertainty. The observed (expected) results are shown by the solid (empty) bars. png (144kB), eps (16kB), pdf (15kB) Figure 4:Summary of likelihood scans in the 2D plane of signal strength μ versus Higgs boson mass mH for the ATLAS and CMS experiments. The 68% CL confidence regions of the individual measurements are shown by the dashed curves and of the overall combination by the solid curve. The markers indicate the respective best-fit values. The SM signal strength is indicated by the horizontal line at μ=1. png (132kB), eps (15kB), pdf (16kB)

## Table from the paper

 Table 1:Systematic uncertainties δmH (see text) associated with the indicated effects for each of the four input channels, and the corresponding contributions of ATLAS and CMS to the systematic uncertainties of the combined result. "ECAL" refers to the electromagnetic calorimeters. The numbers in parentheses indicate expected values obtained from the prefit Asimov data set discussed in the text. The uncertainties for the combined result are related to the values of the individual channels through the relative weight of the individual channel in the combination, which is proportional to the inverse of the respective uncertainty squared. The top section of the table divides the sources of systematic uncertainty into three classes, which are discussed in the text. The bottom section of the table shows the total systematic uncertainties estimated by adding the individual contributions in quadrature, the total systematic uncertainties evaluated using the nominal method discussed in the text, the statistical uncertainties, the total uncertainties, and the analysis weights, illustrative of the relative weight of each channel in the combined mH measurement. png (374kB), pdf (37kB)

 Table 1:Systematic uncertainties δmH (see text) associated with the indicated effects for ATLAS, CMS, and the combined result. The numbers in parentheses indicate expected values obtained from the prefit Asimov data set discussed in the text. The top section of the table divides the sources of systematic uncertainty into three classes, which are discussed in the text. The bottom section of the table shows the total systematic uncertainties estimated by adding the individual contributions in quadrature, the total systematic uncertainties evaluated using the nominal method discussed in the text, the statistical uncertainties, the total uncertainties, and the analysis weights, illustrative of the relative weight of each experiment in the combined mH measurement. png (386kB),pdf (36kB)
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