Abstract
CMS results are presented on the measurement of properties of the Higgs-like particle discovered last summer with a mass in the range of 125–126 GeV, based on the full statistics of about 25 fb−1 , collected in 2011 and 2012 at 7 and 8 TeV respectively. Five decay channels are considered for these studies, namely the ZZ, γγ , WW, ττ , and bb modes. The mass of the new boson is measured to be 125.7 ± 0.4 GeV. The event yields measured by the different analyses, targeting specific decay modes and production mechanisms, are consistent with those expected for the standard model (SM) Higgs boson, with an overall best-fit signal strength of 0.80 ± 0.14 at the measured mass. A discussion on the measurement of the couplings and the spin-parity properties of this new particle is presented, using the most recent results.
Highlights
Within the Standard Model (SM) of particle physics [1,2,3], the particle masses arise from the spontaneous breaking of the electroweak symmetry which is implemented through the Higgs mechanism
The properties of the recently discovered boson have been measured with the CMS experiment at the Large Hadron Collider (LHC) using the full 2011 and 2012 dataset, consisting of up to 5.1 fb−1 collected at 7 TeV and up to 19.6 fb−1 at 8 TeV center-ofmass energy respectively
Five exclusive decay modes are combined in the measurement, namely the ZZ(∗) → 4l, γγ, WW(∗) → 2l2ν, ττ, and bb final states
Summary
Within the Standard Model (SM) of particle physics [1,2,3], the particle masses arise from the spontaneous breaking of the electroweak symmetry which is implemented through the Higgs mechanism. After breaking of the electroweak symmetry, only one scalar field is present in the theory and the corresponding quantum, the Higgs boson, should be experimentally observable [4,5,6,7,8,9]. An updated mass measurement and a set of tests on the properties of the new resonance with the CMS detector [12] are reported. The comprehensive results on the new boson property measurements at CMS can be found in Ref. The comprehensive results on the new boson property measurements at CMS can be found in Ref. [13]
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