Naslov
Measurement of the production and decay of a Higgs boson in the four-lepton final state

Autori
Amapane, N. ; ... ; Kovac, M. ; Plestina, R. ; Puljak, I. ; ...

Izvornik
CMS Analysis Note 2013/108

Vrsta, podvrsta
Ostale vrste radova, ostalo

Godina
2013

Ključne riječi
CMS; Higgs boson

Sažetak
The observation and properties of a Higgs boson candidate in the H -> ZZ -> 4l decay channel, with l = e, mu, are reported using data from pp collisions corresponding to an integrated luminosity of 5.1 fb-1 at center-of-mass energy of sqrt(s) = 7 TeV and 19.7 fb-1 at sort(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, at a measured mass of mH = 125.6+0.5-0.4(stat.) +/- 0.1(syst.) GeV and a total width <= 3.4 GeV at a 95% confidence level. The production cross section of the new boson times the 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 the tested spin-one bosons hypotheses are excluded at a 99% confidence level or higher. All the tested spin-two bosons hypotheses are excluded at a 95% confidence level or higher. The presence of an additional standard model like Higgs boson with a mass between 114.5- 119.0 GeV or 129.5-832.0 GeV is ruled out at a 95% confidence level.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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