Source-linked AI summary
Combined Measurement of the Higgs Boson Mass in $pp$ Collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS and CMS Experiments
ATLAS, CMS Collaborations
TL;DR
The Higgs boson mass is a fundamental parameter, and improved precision informs predictions for other Higgs properties and tests of Standard Model consistency. Combining ATLAS and CMS Run 1 data in two decay channels, the paper measures mH = 125.09 ± 0.21 (stat.) ± 0.11 (scale) ± 0.02 (other) ± 0.01 (theory) GeV.
Problem
The Higgs-boson mass is a fundamental parameter whose precision informs predictions for other Higgs properties and comparisons that test Standard Model consistency.
Source: p. 3Method
The paper combines ATLAS and CMS Run 1 data in the H→γγ and H→ZZ→4ℓ channels, with minimal reliance on the assumption that the Higgs boson behaves as predicted by the Standard Model.
Source: p. 11Results
mH = 125.09 ± 0.21 (stat.) ± 0.11 (scale) ± 0.02 (other) ± 0.01 (theory) GeV; the four measurements across two channels and two experiments agree within 2 σ.
Source: pp. 9, 11Takeaways & Limitations
The combined measurement improves upon the individual experiments’ results and is the most precise measurement to date of the Higgs-boson mass.
Source: p. 11The VBF+VH combination is omitted because the ATLAS H→γγ mass measurement is not sensitive to μγγ.
Source: p. 11
Abstract
from arXiv · showhide
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 $H \rightarrow γγ$ and $H \rightarrow ZZ\rightarrow 4\ell$ 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 $m_{H} = 125.09\pm0.21\,\mathrm{(stat.)}\pm0.11\,\mathrm{(syst.)}~\mathrm{GeV}$.