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.

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

Albergo, S.
Membro del Collaboration Group
;
Cappello, G.
Membro del Collaboration Group
;
Chiorboli, M.
Membro del Collaboration Group
;
Costa, S.
Membro del Collaboration Group
;
Potenza, R.
Membro del Collaboration Group
;
Tricomi, A.
Membro del Collaboration Group
;
Tuve, C.
Membro del Collaboration Group
;
2014-01-01

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.
2014
Nuclear and High Energy Physics; Physics and Astronomy (miscellaneous)
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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/20.500.11769/314816
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 355
  • ???jsp.display-item.citation.isi??? 420
social impact