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Measurement of the Higgs boson mass and width using the four-lepton final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV

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arxiv 2409.13663 v2 pith:2I73BCJ5 submitted 2024-09-20 hep-ex

CMS Collaboration This is my paper · ORCID
classification hep-ex
keywords bosonhiggswidthmassproductionoff-shelldecayleptons
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

A measurement of the Higgs boson mass and width via its decay to two Z bosons is presented. Proton-proton collision data collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb$^{-1}$ at a center-of-mass energy of 13 TeV is used. The invariant mass distribution of four leptons in the on-shell Higgs boson decay is used to measure its mass and constrain its width. This yields the most precise single measurement of the Higgs boson mass to date, 125.04 $\pm$ 0.12 GeV, and an upper limit on the width $\Gamma_\mathrm{H}$ $\lt$ 330 MeV at 95% confidence level. A combination of the on- and off-shell Higgs boson production decaying to four leptons is used to determine the Higgs boson width, assuming that no new virtual particles affect the production, a premise that is tested by adding new heavy particles in the gluon fusion loop model. This result is combined with a previous CMS analysis of the off-shell Higgs boson production with decay to two leptons and two neutrinos, giving a measured Higgs boson width of 3.0 $^{+2.0}_{-1.5}$ MeV, in agreement with the standard model prediction of 4.1 MeV. The strength of the off-shell Higgs boson production is also reported. The scenario of no off-shell Higgs boson production is excluded at a confidence level corresponding to 3.8 standard deviations.

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Cited by 10 Pith papers

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  1. Off-shell Higgs boson measurements: Yukawa couplings, self-coupling, compositeness, and width

    hep-ex 2026-07 accept novelty 7.0 of 10

    Using off-shell Higgs production in 138 fb^-1 of 13 TeV CMS data, the collaboration measured Γ_H = 5.1^{+2.0}_{-1.8} MeV, excluded no off-shell production at >5σ, and set the first direct 95% CL lower bound Λ_H > 870 ...

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    hep-ex 2026-08 accept novelty 6.0 of 10

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    hep-ex 2026-08 accept novelty 5.0 of 10

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    hep-ex 2026-07 accept novelty 4.0 of 10

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    ATLAS measures the Higgs to Z and photon signal yield as 1.3 +0.6 -0.5 times the Standard Model prediction in the combined 305 inverse femtobarn dataset, with 2.5 sigma observed significance.

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    The author computes the one-loop Higgs self-energy and reinterprets the on-shell renormalized propagator as a momentum-dependent Higgs mass, claiming a 0.31% deviation testable at the LHC.

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