Measurement of the properties of a Higgs boson in the four-lepton final state

Measurement of the properties of a Higgs boson in the four-lepton final state

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The properties of a Higgs boson candidate are measured in the H → ZZ → 4ℓ decay channel, with ℓ = e, μ, using data from pp collisions corresponding to an integrated luminosity of 5.1  fb[superscript −1] at the center-of-mass energy of √s = 7  TeV and 19.7  fb[superscript −1] at √s = 8  TeV, recorded...

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Bibliographic Details
Main Authors: Apyan, Aram, Barbieri, Riccardo, Bauer, Gerry P., Busza, Wit, Cali, Ivan Amos, Chan, M., Di Matteo, Leonardo, Dutta, V., Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Klute, Markus, Lai, Yue Shi, Lee, Y.-J., Levin, A., Luckey, P. David, Jr., Ma, Teng, Paus, Christoph M. E., Ralph, Duncan Kelley, Roland, Christof E., Roland, Gunther M., Stephans, George S. F., Stockli, Fabian, Sumorok, Konstanty C., Velicanu, Dragos Alexandru, Veverka, Jan, Wyslouch, Boleslaw, Yang, M., Yoon, A. S., Zanetti, Marco, Zhukova, Victoria
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: American Physical Society 2014
Online Access:http://hdl.handle.net/1721.1/89048
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0002-7945-005X
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0003-1486-606X
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0001-9236-6621
https://orcid.org/0000-0002-0869-5631
https://orcid.org/0000-0002-1136-6900
Description
Summary:The properties of a Higgs boson candidate are measured in the H → ZZ → 4ℓ decay channel, with ℓ = e, μ, using data from pp collisions corresponding to an integrated luminosity of 5.1  fb[superscript −1] at the center-of-mass energy of √s = 7  TeV and 19.7  fb[superscript −1] at √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, a measured mass of 125.6 ± 0.4(stat) ± 0.2(syst)  GeV, and a total width ≤3.4  GeV at the 95% confidence level. The production cross section of the new boson times its branching fraction to four leptons is measured to be 0.93[+0.26 over −0.23](stat)[+0.13 over −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 tested spin-1 boson hypotheses are excluded at the 99% confidence level or higher. All tested spin-2 boson hypotheses are excluded at the 95% confidence level or higher.

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