The properties of a Higgs boson candidate are measured in the H -> ZZ -> 4l decay channel, with l=e, μ, using data from pp collisions corresponding to an integrated luminosity of 5.1  fb-1 at the center-of-mass energy of √s = 7  TeV and 19.7  fb-1 at √s = 8  TeV, 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 ≤ 3.4  GeV 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+0.26-0.23(stat)+0.13-0.09(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 / S. Chatrchyan, V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. E. O, C. Fabjan, M. Friedl, R. Fruhwirth, V. M. Ghete, C. Hartl, N. H. Ormann, J. Hrubec, M. Jeitler, W. Kiesenhofer, V. Knunz, M. Krammer, I. Kratschmer, et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - ELETTRONICO. - 89:092007:(2014), pp. 1-45. [10.1103/PhysRevD.89.092007]

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

CIULLI, VITALIANO;D'ALESSANDRO, RAFFAELLO;FOCARDI, ETTORE;GONZI, SANDRO;GORI, VALENTINA;LENZI, PIERGIULIO;TROPIANO, ANTONIO;
2014

Abstract

The properties of a Higgs boson candidate are measured in the H -> ZZ -> 4l decay channel, with l=e, μ, using data from pp collisions corresponding to an integrated luminosity of 5.1  fb-1 at the center-of-mass energy of √s = 7  TeV and 19.7  fb-1 at √s = 8  TeV, 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 ≤ 3.4  GeV 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+0.26-0.23(stat)+0.13-0.09(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
89:092007
1
45
S. Chatrchyan; V. Khachatryan; A. M. Sirunyan; A. Tumasyan; W. Adam; T. Bergauer; M. Dragicevic; J. E. O; C. Fabjan; M. Friedl; R. Fruhwirth; V. M. Gh...espandi
File in questo prodotto:
File Dimensione Formato  
PhysRevD.89.092007.pdf

accesso aperto

Tipologia: Pdf editoriale (Version of record)
Licenza: Open Access
Dimensione 2.68 MB
Formato Adobe PDF
2.68 MB Adobe PDF

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

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/879734
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 371
  • ???jsp.display-item.citation.isi??? 444
social impact