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.

Measurement of the properties of a Higgs boson in the four-lepton final state

LIGABUE, FRANCO;Rolandi, G. Cv;
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
Settore FIS/01 - Fisica Sperimentale
File in questo prodotto:
File Dimensione Formato  
PhysRevD.89.092007.pdf

accesso aperto

Descrizione: journal article full text
Tipologia: Published version
Licenza: Solo Lettura
Dimensione 2.68 MB
Formato Adobe PDF
2.68 MB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/59826
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 356
  • ???jsp.display-item.citation.isi??? 421
  • OpenAlex ND
social impact