Abstract
Integrated fiducial cross sections for the production of four leptons via the H to 4l decays (l = e, mu) are measured in pp collisions at sqrt(s) = 7 and 8 TeV. Measurements are performed with data corresponding to integrated luminosities of 5.1 inverse femtobarns at 7 TeV, and 19.7 inverse femtobarns at 8 TeV, collected with the CMS experiment at the LHC. Differential cross sections are measured using the 8 TeV data, and are determined as functions of the transverse momentum and rapidity of the four-lepton system, accompanying jet multiplicity, transverse momentum of the leading jet, and difference in rapidity between the Higgs boson candidate and the leading jet. A measurement of the Z to 4l cross section, and its ratio to the H to 4l cross section is also performed. All cross sections are measured within a fiducial phase space defined by the requirements on lepton kinematics and event topology. The integrated H to 4l fiducial cross section is measured to be 0.56 +0.67-0.44 (stat) +0.21-0.06 (syst) fb at 7 TeV, and 1.11 +0.41-0.35 (stat) +0.14-0.10 (syst) fb at 8 TeV. The measurements are found to be compatible with theoretical calculations based on the standard model.
Highlights
Background related uncertaintiesQCD scaleparton distribution functions (PDF) setReducible background (Z + X)Jet resolution and energy scaleSignal related uncertaintiesLepton energy scaleLepton energy resolutionJet energy scale and resolutionCombinatorial signal-induced contributionEffect on the final measurement Model dependence
Maximum likelihood fit to the signal and background m4 spectra in data collected at s = 8 TeV, used to extract the integrated H → 4 fiducial cross section for the m4 range from 105 to 140 GeV, is shown in figure 2
We have presented measurements of the integrated and differential fiducial cross sections for the production of four leptons via the H → 4 decays in pp collisions at centre-ofmass energies of 7 and 8 TeV
Summary
The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. The technique uses an optimized combination of all information from the CMS sub-detectors to identify and reconstruct individual particles in the collision event [20, 21]. Energy deposits from the multiple pp interactions (pileup) and from the underlying event are subtracted when computing the energy of jets and isolation of reconstructed objects using the FastJet technique [24,25,26]. Details on the experimental techniques for the reconstruction, identification, and isolation of electrons, muons and jets, as well as on the efficiencies of these techniques can be found in refs. Details on the procedure used to calibrate the leptons and jets in this analysis can be found in ref. [17]
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