Abstract
A summary of the latest results on the combined measurement of the Higgs boson mass in the H → ZZ* → 4l and the H → γγ decay channels with the ATLAS detector is presented. The analysis uses 25 fb−1 of pp collision data recorded by the ATLAS detector at the CERN Large Hadron Collider at centre-of-mass energies of 7TeV and 8 TeV during 2011 and 2012. The combined measured value of the Higgs boson mass is mH = 125.36 ± 0.37 (stat) ± 0.18 (syst) GeV.
Highlights
Since the discovery of the Higgs boson by the CMS and ATLAS collaborations in July 2012 [1, 2], many efforts have been made to measure the Higgs boson properties
The ATLAS detector previously measured the Higgs boson mass, with the same data quoted here, at mH = 125.5 ± 0.2(stat)+−00..56(syst) GeV with a signal strength, defined as the number of observed events normalized to the SM prediction, of An updated and improved mass μ = 1.33+−00..2118 [3]. measurement was done in the
It is immersed in toroidal magnetic fields in the central and end-cap regions having an integral of approximately 3 Tm to 6 Tm respectively
Summary
Since the discovery of the Higgs boson by the CMS and ATLAS collaborations in July 2012 [1, 2], many efforts have been made to measure the Higgs boson properties. The ATLAS detector previously measured the Higgs boson mass, with the same data quoted here, at mH = 125.5 ± 0.2(stat)+−00..56(syst) GeV with a signal strength, defined as the number of observed events normalized to the SM prediction, of An updated and improved mass μ = 1.33+−00..2118 [3]. The new result is based on an improved calibration for photons and electrons, new corrections to the muon momentum uncertainty and improved analysis techniques. A summary of the updated mass measurement using these channels is presented this proceedings.
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