Measurement of the SM Higgs boson mass in the diphoton and 44\ell decay channels using the ATLAS detector

Collaboration
for the collaboration.
Mar 20, 2018
8 pages
Published in:
  • PoS EPS-HEP2017 (2018) 329
Contribution to:
  • Published: Mar 20, 2018 by SISSA
Report number:
  • ATL-PHYS-PROC-2018-013
Experiments:

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Abstract: (PoS)
One of the fundamental properties of the Higgs boson, its mass, is measured by studying the invariant mass of the 44 \ell and diphoton decay channels with about 36 fb1^{−1} of data collected by the ATLAS experiment at the Large Hadron Collider (LHC). Since in these channels the final state can be fully reconstructed, an invariant mass peak with a good experimental resolution can be obtained in a model independent way and used as an input to compare other Higgs properties measurements with the SM predictions. The measured values of the Higgs boson mass for the HZZ4H \to ZZ^* \to 4\ell and HγγH\to\gamma\gamma decay modes are mH=124.88±0.37 (stat)±0.05 (syst) m_H = 124.88\pm{0.37} \ (\mathrm{stat}) \pm 0.05 \ (\mathrm{syst}) GeV and mH=125.11±0.21 (stat)±0.36 (syst) m_H = 125.11 \pm{0.21} \ (\mathrm{stat}) \pm{0.36} \ (\mathrm{syst}) GeV respectively, and the mass derived from the combined fit is mH=124.98±0.19 (stat)±0.21 (syst) m_H = 124.98 \pm{0.19} \ (\mathrm{stat}) \pm{0.21} \ (\mathrm{syst}) GeV. These results are in good agreement with the LHC Run-1 average of 125.09±0.24125.09\pm0.24 GeV.
  • talk: Venice 2017/07/05
  • p p: scattering
  • p p: colliding beams
  • Higgs particle: radiative decay
  • Z0: pair production
  • Z0: leptonic decay
  • Higgs particle: mass: measured
  • CERN LHC Coll
  • ATLAS
  • mass spectrum: two-photon