Measurement of the properties of a Higgs boson in the four-lepton final state
نویسنده
چکیده
The properties of a Higgs boson candidate are measured in the H → ZZ → 4l decay channel, with l 1⁄4 e, μ, using data from pp collisions corresponding to an integrated luminosity of 5.1 fb−1 at the centerof-mass energy of ffiffi s p 1⁄4 7 TeV and 19.7 fb−1 at ffiffi s p 1⁄4 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 0.4ðstatÞ 0.2ðsystÞ 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 0.93þ0.26 −0.23 ðstatÞþ0.13 −0.09 ðsystÞ 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.
منابع مشابه
Measurement of the properties of a Higgs boson in the four-lepton final state
The properties of a Higgs boson candidate are measured in the H → ZZ → 4` decay channel, with ` = e, μ, using data from pp collisions corresponding to an integrated luminosity of 5.1 fb−1 at the center-of-mass energy of √ s = 7 TeV and 19.7 fb−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 de...
متن کاملRole of polarization in probing anomalous gauge interactions of the Higgs boson
We explore the use of polarized e+/e− beams and/or the information on final state decay lepton polarizations in probing the interaction of the Higgs boson with a pair of vector bosons. A model independent analysis of the process e+e− → f f̄H, where f is any light fermion, is carried out through the construction of observables having identical properties under the discrete symmetry transformation...
متن کاملConstraints on anomalous Higgs boson couplings using production and decay information in the four-lepton final state
Article history: Received 4 July 2017 Received in revised form 29 September 2017 Accepted 10 October 2017 Available online 16 October 2017 Editor: M. Doser
متن کاملMeasurements of Higgs boson production and couplings in the four-lepton channel in pp collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
The final ATLAS Run 1 measurements of Higgs boson production and couplings in the decay channel H → ZZ → lþl−l0þl0−, where l, l0 1⁄4 e or μ, are presented. These measurements were performed using pp collision data corresponding to integrated luminosities of 4.5 and 20.3 fb−1 at center-of-mass energies of 7 and 8 TeV, respectively, recorded with the ATLAS detector at the LHC. The H → ZZ → 4l sig...
متن کاملCan the Higgs Sector Be Probed in Tau-Lepton Decays?
It is unlikely that a high statistics study of r-lepton decays will be sensitive to the Higgs boson sector of electroweak physics. A Tau-Charm Factory is an ideal facility for the study of rare deca.ys of the rlepton. At a machine discussed in these Proceedings, one might expect to produce on the order of lo7 r’s per year. It is an interesting exercise to consider whether such a data sample is ...
متن کامل