Abstract
CMS and ATLAS collaborations have observed a Higgs-like boson at around 125 GeV. Differential measurements of signal strength(μ) of the Higgs-like boson in diphoton decay channel is reported here. The analysis uses the entire dataset collected by the CMS experiment during the years 2011 and 2012. The dataset corresponds to integrated luminosities of 5.1fb−1 at s=7 TeV and 19.7fb−1 at s=8 TeV. Spin hypothesis tests have been performed comparing the standard model Higgs boson with a spin-2 graviton-like model with minimal couplings. The hypothesis of the signal being 2m+ is disfavoured.
Highlights
A Higgs boson [1] has been observed at around MH = 125 GeV by both general purpose experiments, ATLAS and CMS, at LHC [3, 4]
The Monte Carlo simulation of detector response employs a detailed description of the CMS detector, and uses GEANT4 [5]
The diphoton mass resolution is driven by photon energy resolution and photon angular resolution, which is dominated by the knowledge of the vertex from which the photons originate
Summary
A Higgs boson [1] has been observed at around MH = 125 GeV by both general purpose experiments, ATLAS and CMS, at LHC [3, 4]. After this observation it has become very important to measure the properties of the state to determine if they are compatible with predictions from the standard model(SM). 2. Data Samples fusion and VBF processes are obtained using the nextto-leading order matrix-element generator POWHEG (version 1.0) [6] interfaced with PYTHIA [2]. For the spin graviton-like processes (gg, qq) the simulation uses the JHUGEN [9] generator at leading-order, interfaced with PYTHIA.
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