The latest Higgs boson mass measurement from the CMS experiment, in the highly precise diphoton decay channel is 125.78 ± 0.26 GeV, which is 2.3 sigma above the current PDG value and modifies the combined value from CMS to 125.38 ± 0.14 GeV.
This tends to pull up the global average measurement of the Higgs boson mass from its Particle Data Group value of 125.10 ± 0.14 GeV which incorporated a combined value of 125.25 ± 0.20 ± 0.08 from CMS. The PDG used a value of 124.86 ± 0.27 from the ATLAS experiment. Since the new CMS number is very precise, this new measurement receives considerable weight in that determination, and probably pulls the global average up to 125.20 GeV, with a smaller margin of error than the current 0.14 GeV. The ATLAS combined average and the CMS combined average are consistent with each other at roughly the 1.7 sigma level.
(Submitted on 15 Feb 2020)
A measurement of the mass of the Higgs boson in the diphoton decay channel is presented. This analysis is based on 35.9 fbof proton-proton collision data collected during the 2016 LHC running period, with the CMS detector at a center-of-mass energy of 13 TeV. A refined detector calibration and new analysis techniques have been used to improve the precision of this measurement. The Higgs boson mass is measured to be 125.78 0.26 GeV. This is combined with a measurement of already performed in the H ZZ 4 decay channel using the same data set, giving 125.46 0.16 GeV. This result, when further combined with an earlier measurement of using data collected in 2011 and 2012 with the CMS detector, gives a value for the Higgs boson mass of 125.38 0.14 GeV. This is currently the most precise measurement of the mass of the Higgs boson.