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 ±0.12  GeV, and an upper limit on the width Γ𝐻 <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.

Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J. w., Bergauer, T., Chatterjee, S., et al. (2025). Measurement of the Higgs boson mass and width using the four-lepton final state in proton-proton collisions at √𝑠 =13  TeV. PHYSICAL REVIEW D, 111(9), 1-34 [10.1103/physrevd.111.092014].

Measurement of the Higgs boson mass and width using the four-lepton final state in proton-proton collisions at √𝑠 =13  TeV

Battilana, C.;Bonacorsi, D.;Castro, A.;Cuffiani, M.;Diotalevi, T.;Fanfani, A.;Giommi, L.;Guiducci, L.;Lorusso, M.;Lunerti, L.;Paggi, G.;Rossi Tisbeni, S.;Rovelli, T.;Siroli, G.  P.;
2025

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 ±0.12  GeV, and an upper limit on the width Γ𝐻 <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.
2025
Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J. w., Bergauer, T., Chatterjee, S., et al. (2025). Measurement of the Higgs boson mass and width using the four-lepton final state in proton-proton collisions at √�� =13  TeV. PHYSICAL REVIEW D, 111(9), 1-34 [10.1103/physrevd.111.092014].
Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J.  w.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Hussain, P.  s.; Jeitler, M...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1045151
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