Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC


Chatrchyan S., Khachatryan V., Sirunyan A., Tumasyan A., Adam W., Aguilo E., ...Daha Fazla

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, cilt.716, sa.1, ss.30-61, 2012 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 716 Sayı: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.physletb.2012.08.021
  • Dergi Adı: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.30-61
  • Anahtar Kelimeler: CMS, Physics, Higgs, MODEL HIGGS-BOSON, STANDARD MODEL, PP COLLISIONS, ELECTROWEAK CORRECTIONS, PARTON DISTRIBUTIONS, BROKEN SYMMETRIES, QCD CORRECTIONS, SEARCH, COLLIDERS, SPECTRUM
  • Marmara Üniversitesi Adresli: Hayır

Özet

Results are presented from searches for the standard model Higgs boson in proton-proton collisions at s=7 and 8 TeV in the Compact Muon Solenoid experiment at the LHC, using data samples corresponding to integrated luminosities of up to 5.1 fb-1 at 7 TeV and 5.3 fb-1 at 8 TeV. The search is performed in five decay modes: γγ, ZZ, W+W-, τ+τ-, and bb-. An excess of events is observed above the expected background, with a local significance of 5.0 standard deviations, at a mass near 125 GeV, signalling the production of a new particle. The expected significance for a standard model Higgs boson of that mass is 5.8 standard deviations. The excess is most significant in the two decay modes with the best mass resolution, γγ and ZZ; a fit to these signals gives a mass of 125.3±0.4(stat.)±0.5(syst.) GeV. The decay to two photons indicates that the new particle is a boson with spin different from one. © 2012 CERN.