The properties of a Higgs boson candidate are measured in the H→ZZ→4 decay channel, with =e, μ, using data from pp collisions corresponding to an integrated luminosity of 5.1fb-1 at the center-of-mass energy of s=7TeV and 19.7fb-1 at s=8TeV, recorded with the CMS detector at the LHC. The new boson is observed as a narrow resonance with a local significance of 6.8 standard deviations, a measured mass of 125.6±0.4(stat)±0. 2(syst)GeV, and a total width ≤3.4GeV at the 95% confidence level. The production cross section of the new boson times its branching fraction to four leptons is measured to be 0.93-0.23+0.26(stat)-0.09+0.13(syst) times that predicted by the standard model. Its spin-parity properties are found to be consistent with the expectations for the standard-model Higgs boson. The hypotheses of a pseudoscalar and all tested spin-1 boson hypotheses are excluded at the 99% confidence level or higher. All tested spin-2 boson hypotheses are excluded at the 95% confidence level or higher. © 2014 CERN, for the CMS Collaboration.
Chatrchyan, S., Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., et al. (2014). Measurement of the properties of a Higgs boson in the four-lepton final state. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89(9) [10.1103/PhysRevD.89.092007].
Measurement of the properties of a Higgs boson in the four-lepton final state
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2014
Abstract
The properties of a Higgs boson candidate are measured in the H→ZZ→4 decay channel, with =e, μ, using data from pp collisions corresponding to an integrated luminosity of 5.1fb-1 at the center-of-mass energy of s=7TeV and 19.7fb-1 at s=8TeV, recorded with the CMS detector at the LHC. The new boson is observed as a narrow resonance with a local significance of 6.8 standard deviations, a measured mass of 125.6±0.4(stat)±0. 2(syst)GeV, and a total width ≤3.4GeV at the 95% confidence level. The production cross section of the new boson times its branching fraction to four leptons is measured to be 0.93-0.23+0.26(stat)-0.09+0.13(syst) times that predicted by the standard model. Its spin-parity properties are found to be consistent with the expectations for the standard-model Higgs boson. The hypotheses of a pseudoscalar and all tested spin-1 boson hypotheses are excluded at the 99% confidence level or higher. All tested spin-2 boson hypotheses are excluded at the 95% confidence level or higher. © 2014 CERN, for the CMS Collaboration.
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Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione.
