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.
Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
STRUMIA, ALESSANDRO;Bianchini, L.;BASTI, ANDREA;MESSINEO, ALBERTO MARIA;RIZZI, ANDREA;TONELLI, GUIDO EMILIO;
2012-01-01
Abstract
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.| File | Dimensione | Formato | |
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Observation of a new boson.PDF
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