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

Abstract: Results are presented from searches for the standard model Higgs boson in proton?proton collisions at 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: ??, ZZ, , , and . 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, ?? and ZZ; a fit to these signals gives a mass of . The decay to two photons indicates that the new particle is a boson with spin different from one.

Authorship: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Aguilo E., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hammer J., Hoch M., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Knünz V., Krammer M., Krätschmer I., Liko D., Majerotto W., Mikulec I., Pernicka M., Rahbaran B., Rohringer C., Rohringer H., Schöfbeck R., Strauss J., Szoncsó F., Taurok A., Waltenberger W., Walzel

Fuente: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012, 716(1), 30-61

Publisher: Elsevier

Year of publication: 2012

No. of pages: 32

Publication type: Article

DOI: 10.1016/j.physletb.2012.08.021

ISSN: 0370-2693,1873-2445

Publication Url: https://doi.org/10.1016/j.physletb.2012.08.021

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