Naslov
Observation of the diphoton decay of the Higgs boson and measurement of its properties

Autori
Khachatryan V. ; ... ; Pleština, Roko ; ... ; Godinović, Nikola ; Lelas, Damir ; Polić, Dunja ; Puljak, Ivica ; Antunović, Željko ; Kovač, Marko ; Brigljević, Vuko ; Kadija, Krešo ; Luetić, Jelena ; Mekterović, Darko ; Morović, Srećko ; Sudić, Lucija ; ... ; Ferenček, Dinko ; ... ; Đurić, Senka ; ... ; Woods, N.

Kolaboracija
CMS Collaboration

Izvornik
European physical journal C : particles and fields (1434-6044) 74 (2014); 3076, 49

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Higgs properties CMS photon

Sažetak
Observation of the diphoton decay mode of the recently discovered Higgs boson and measurement of some of its properties are reported. The analysis uses the entire dataset collected by the CMS experiment in proton-proton collisions during the 2011 and 2012 LHC running periods. The data samples correspond to integrated luminosities of 5.1 fb−1at √s = 7 TeV and 19.7 fb−1at 8 TeV. A clear signal is observed in the diphoton channel at a mass close to 125 GeV with a local significance of 5.7 σ, where a significance of 5.2 σ is expected for the standard model Higgs boson. The mass is measured to be 124.70 ± 0.34 GeV = 124.70 ± 0.31 (stat) ± 0.15 (syst) GeV, and the best-fit signal strength relative to the standard model prediction is 1.14+0.26 −0.23 = 1.14 ± 0.21 (stat) +0.09 −0.05 (syst) +0.13 −0.09 (theo). Additional measurements include the signal strength modifiers associated with different production mechanisms, and hypothesis tests between spin-0 and spin-2 models.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA