${{\mathit H}}$ DECAY WIDTH INSPIRE search



The total decay width for a light Higgs boson with a mass in the observed range is not expected to be directly observable at the LHC. For the case of the Standard Model the prediction for the total width is about 4 MeV, which is three orders of magnitude smaller than the experimental mass resolution. There is no indication from the results observed so far that the natural width is broadened by new physics effects to such an extent that it could be directly observable. Furthermore, as all LHC Higgs channels rely on the identification of Higgs decay products, the total Higgs width cannot be measured indirectly without additional assumptions. The different dependence of on-peak and off-peak contributions on the total width in Higgs decays to ${{\mathit Z}}{{\mathit Z}^{*}}$ and interference effects between signal and background in Higgs decays to ${{\mathit \gamma}}{{\mathit \gamma}}$ can provide additional information in this context. Constraints on the total width from the combination of on-peak and off-peak contributions in Higgs decays to ${{\mathit Z}}{{\mathit Z}^{*}}$ rely on the assumption of equal on- and off-shell effective couplings. Without an experimental determination of the total width or further theoretical assumptions, only ratios of couplings can be determined at the LHC rather than absolute values of couplings.

S126W
VALUE (MeV) CL% DOCUMENT ID TECN  COMMENT
$\bf{ 3.0 {}^{+1.5}_{-0.7}}$ OUR AVERAGE
$4.3$ ${}^{+2.7}_{-1.9}$ 1
AAD
2025AQ
 ATLS ${{\mathit p}}{{\mathit p}}$, 13 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $/$ ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$, ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$
$0.9$ ${}^{+3.4}_{-0.9}$ 2
AAD
2025AV
 ATLS ${{\mathit p}}{{\mathit p}}$, 13 TeV, ${{\mathit W}}$ ${{\mathit W}^{(*)}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$
$3.0$ ${}^{+2.0}_{-1.5}$ 3
HAYRAPETYAN
2025L
 CMS ${{\mathit p}}{{\mathit p}}$, 13 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $/$ ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$, ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<160$ 95 4
AAD
2025E
 ATLS ${{\mathit p}}{{\mathit p}}$, 13 TeV, on-shell Higgs and ${{\mathit t}}{{\overline{\mathit t}}}{{\mathit t}}{{\overline{\mathit t}}}$
$<330$ 95 5
HAYRAPETYAN
2025L
 CMS ${{\mathit p}}{{\mathit p}}$, 13 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$
$2.9$ ${}^{+2.3}_{-1.7}$ 6
HAYRAPETYAN
2025L
 CMS ${{\mathit p}}{{\mathit p}}$, 13 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$
$4.4$ ${}^{+3.0}_{-2.2}$ 7
AAD
2023BR
 ATLS ${{\mathit p}}{{\mathit p}}$, 13 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $/$ ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$, ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$
$3.2$ ${}^{+2.4}_{-1.7}$ 8
TUMASYAN
2022AM
 CMS ${{\mathit p}}{{\mathit p}}$, 13 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $/$ ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$, ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$
$3.2$ ${}^{+2.8}_{-2.2}$ 9
SIRUNYAN
2019BL
 CMS ${{\mathit p}}{{\mathit p}}$, 7, 8, 13 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $/$ ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$
$<14.4$ 95 10
AABOUD
2018BP
 ATLS ${{\mathit p}}{{\mathit p}}$, 13 TeV, ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$, 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$
$<1100$ 95 11
SIRUNYAN
2017AV
 CMS ${{\mathit p}}{{\mathit p}}$, 13 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$
$<26$ 95 12
KHACHATRYAN
2016BA
 CMS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV, ${{\mathit W}}{{\mathit W}^{(*)}}$
$<13$ 95 13
KHACHATRYAN
2016BA
 CMS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV,${{\mathit Z}}{{\mathit Z}^{(*)}},{{\mathit W}}{{\mathit W}^{(*)}}$
$<22.7$ 95 14
AAD
2015BE
 ATLS ${{\mathit p}}{{\mathit p}}$, 8 TeV, ${{\mathit Z}}{{\mathit Z}^{(*)}}$, ${{\mathit W}}{{\mathit W}^{(*)}}$
$<1700$ 95 15
KHACHATRYAN
2015AM
 CMS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV
$ > 3.5 \times 10^{-9}$ 95 16
KHACHATRYAN
2015BA
 CMS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV, flight distance
$<46$ 95 17
KHACHATRYAN
2015BA
 CMS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{(*)}}$ $\rightarrow$ 4 ${{\mathit \ell}}$
$<5000$ 95 18
AAD
2014W
 ATLS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV, ${{\mathit \gamma}}{{\mathit \gamma}}$
$<2600$ 95 18
AAD
2014W
 ATLS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$
$<3400$ 95 19
CHATRCHYAN
2014AA
 CMS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV, ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$
$<22$ 95 20
KHACHATRYAN
2014D
 CMS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV, ${{\mathit Z}}{{\mathit Z}^{(*)}}$
$<2400$ 95 21
KHACHATRYAN
2014P
 CMS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV, ${{\mathit \gamma}}{{\mathit \gamma}}$
1  AAD 2025AQ use 140 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The off-shell Higgs boson production in the ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ (${{\mathit \ell}}$ = ${{\mathit e}}$ , ${{\mathit \mu}}$) decay channel is combined with the on-shell production in the ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ (AAD 2020AQ) decay channel and the off-shell production in the ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$ decay channel (AAD 2023BR, AAD 2025AP) to measure the total width assuming the same on-shell and off-shell coupling modifiers for gluon-fusion and for gauge-boson (${{\mathit \kappa}}{}^{2}_{g,{\mathrm {on-shell}}}~{{\mathit \kappa}}{}^{2}_{V,{\mathrm {on-shell}}}$ = ${{\mathit \kappa}}{}^{4}_{V,{\mathrm {on-shell}}}$ = ${{\mathit \kappa}}{}^{2}_{g,{\mathrm {off-shell}}}~{{\mathit \kappa}}{}^{2}_{V,{\mathrm {off-shell}}}$ = ${{\mathit \kappa}}{}^{4}_{V,{\mathrm {off-shell}}}$). ${{\mathit R}_{{{gg}}}}$ = ${{\mathit \kappa}}{}^{2}_{g,{\mathrm {on-shell}}}/{{\mathit \kappa}}{}^{2}_{g,{\mathrm {off-shell}}}$ and ${{\mathit R}_{{{VV}}}}$ = ${{\mathit \kappa}}{}^{2}_{V,{\mathrm {on-shell}}}/{{\mathit \kappa}}{}^{2}_{V,{\mathrm {off-shell}}}$ are measured to be $1.19$ ${}^{+0.89}_{-0.66}$ and $0.95$ ${}^{+0.44}_{-0.35}$, respectively. Using AAD 2025AQ and AAD 2023BR, ${{\mathit \kappa}}_{g,{\mathrm {off-shell}}}$ and ${{\mathit \kappa}}_{V,{\mathrm {off-shell}}}$ are measured to be $1.09$ ${}^{+0.39}_{-0.35}$ and $0.99$ ${}^{+0.16}_{-0.19}$, respectively. The quoted errors are values at 68$\%$CL.
2  AAD 2025AV measure the total width $\Gamma _{H}$ from off-shell ${{\mathit H}^{*}}$ $\rightarrow$ ${{\mathit W}}{{\mathit W}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$ and on-shell ${{\mathit H}}$ $\rightarrow$ ${{\mathit W}}{{\mathit W}^{*}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$ with data of 140 fb${}^{-1}$ ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV, assuming the off- and on-shell coupling modifiers are the same for both ggF and EW production modes. The quoted value corresponds to $\Gamma _{H}$ $<$ $13.1$ MeV at 95$\%$ CL. The off-shell Higgs signal strength $\mu _{{\mathrm {off-shell}}}$ is measured to be $0.3$ ${}^{+0.9}_{-0.3}$ corresponding $\mu _{{\mathrm {off-shell}}}$ $<$ $3.4$ at 95$\%$ CL. The two off-shell signal strengths for ggF and EW production modes ($\mu {}^{{\mathrm {ggF}}}_{{\mathrm {off-shell}}}$, $\mu {}^{{\mathrm {EW}}}_{{\mathrm {off-shell}}}$) are measured to be $\mu {}^{{\mathrm {ggF}}}_{{\mathrm {off-shell}}}$ = $0.2$ ${}^{+1.3}_{-0.2}$ and $\mu {}^{{\mathrm {EW}}}_{{\mathrm {off-shell}}}$ = $0.4$ ${}^{+3.4}_{-0.4}$.
3  HAYRAPETYAN 2025L use 138 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The on- and off-shell Higgs boson production in the ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ (${{\mathit \ell}}$ = ${{\mathit e}}$ , ${{\mathit \mu}}$) decay channel is combined with the off-shell Higgs boson production in the ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$ (TUMASYAN 2022AM) decay channel to measure the total width. The off-shell Higgs signal strength is measured to be $0.67$ ${}^{+0.42}_{-0.32}$. The scenario of no off-shell contribution is excluded at 3.8 $\sigma $.
4  AAD 2025E constrain the total width using on-shell Higgs measurements and the four top quarks production with 13 TeV data. The tree-level Higgs-top Yukawa coupling is assumed to be the same for on-shell and off-shell Higgs boson production processes. Another assumption is that no BSM contributions affect the ${{\mathit t}}{{\overline{\mathit t}}}{{\mathit t}}{{\overline{\mathit t}}}$ production. The quoted value is obtained by assuming the loop-induced ggF, ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$, and ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$ rates can be modeled as a function of ${{\mathit \kappa}_{{{t}}}}$ and other SM couplings. Otherwise, $\Gamma _{H}$ $<$ 450 MeV is obtained at 95$\%$ CL. Two-dimensional likelihood scan of ($\Gamma _{H}/\Gamma {}^{{\mathrm {SM}}}_{H}$, ${{\mathit \kappa}_{{{t}}}}$) is shown in their Fig. 3.
5  HAYRAPETYAN 2025L obtain an upper limit on the width from the on-shell ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ (${{\mathit \ell}}$ = ${{\mathit e}}$ , ${{\mathit \mu}}$) decays. Data of 138 fb${}^{-1}$ ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV is used.
6  HAYRAPETYAN 2025L use 138 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The on- and off-shell Higgs boson production in the ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ (${{\mathit \ell}}$ = ${{\mathit e}}$ , ${{\mathit \mu}}$) decay channel is used assuming that no new particles affect the gluon fusion production. The scenario of no off-shell contribution is excluded at 3.0 $\sigma $.
7  AAD 2023BR use 139 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The off-shell Higgs boson production in the ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ and ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$ decay channels and the on-shell production in the ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ (${{\mathit \ell}}$ = ${{\mathit e}}$ , ${{\mathit \mu}}$, AAD 2020AQ) decay channels are used to measure the total width. The off-shell Higgs signal strength is measured to be $1.1$ ${}^{+0.7}_{-0.6}$ assuming the same on-shell and off-shell coupling modifiers are used individually for gluon-fusion and for gauge-boson modes. The scenario of no off-shell contribution is excluded at 3.3 $\sigma $. Combining with the on-shell signal strength measurement, the total width normalized to its SM expectation $\Gamma _{H}/\Gamma {}^{SM}_{H}$ is measured to be $1.1$ ${}^{+0.7}_{-0.5}$ assuming the same on-shell and off-shell coupling modifiers are used individually for gluon-fusion and for gauge-boson modes. The observed upper limit on the total width is 10.1 MeV at 95$\%$ CL. See their Fig. 7. See corrected width values in their erratum AAD 2025AP.
8  TUMASYAN 2022AM use up to 140 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The off-shell Higgs boson production in the ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ and ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$ decay channels and the on-shell production in the ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ (${{\mathit \ell}}$ = ${{\mathit e}}$ , ${{\mathit \mu}}$) decay channels are used to measure the total width. The off-shell Higgs signal strength is measured to be $0.62$ ${}^{+0.68}_{-0.45}$ without the constraint on the ratio of the off-shell signal strengths for gluon-fusion and gauge-boson modes. The scenario of no off-shell contribution is excluded at 3.6 $\sigma $. The results are shown in their Table 1 with other constraint scenarios and the decay widths assuming the same coupling modifiers for on- and off-shell couplings (${{\mathit g}_{{{p}}}}$ and ${{\mathit g}_{{{d}}}}$ in their notation). The measurement of anomalous ${{\mathit H}}{{\mathit V}}{{\mathit V}}$ couplings is shown in their Extended Data Table 1 and Fig. 8.
9  SIRUNYAN 2019BL measure the width and anomalous ${{\mathit H}}{{\mathit V}}{{\mathit V}}$ couplings from on-shell and off-shell production in the 4 ${{\mathit \ell}}$ final state. Data of 80.2 fb${}^{-1}$ at 13 TeV, 19.7 fb${}^{-1}$ at 8 TeV, and 5.1 fb${}^{-1}$ at 7 TeV are used. The total width for the SM-like couplings is measured to be also [0.08, 9.16] MeV with 95$\%$ CL, assuming SM-like couplings for on- and off-shells (see their Table VIII). Constraints on the total width for anomalous ${{\mathit H}}{{\mathit V}}{{\mathit V}}$ interaction cases are found in their Table IX. See their Table X for the Higgs boson signal strength in the off-shell region.
10  AABOUD 2018BP use 36.1 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. An observed upper limit on the off-shell Higgs signal strength of 3.8 is obtained at 95$\%$ CL using off-shell Higgs boson production in the ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ and ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ 2 ${{\mathit \ell}}$2 ${{\mathit \nu}}$ decay channels (${{\mathit \ell}}$ = ${{\mathit e}}$ , ${{\mathit \mu}}$). Combining with the on-shell signal strength measurements, the quoted upper limit on the Higgs boson total width is obtained, assuming the ratios of the relevant Higgs-boson couplings to the SM predictions are constant with energy from on-shell production to the high-mass range.
11  SIRUNYAN 2017AV obtain an upper limit on the width from the distribution in ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ (${{\mathit \ell}}$ = ${{\mathit e}}$ , ${{\mathit \mu}}$) decays. Data of 35.9 fb${}^{-1}$ ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV is used. The expected limit is 1.60 GeV.
12  KHACHATRYAN 2016BA derive constraints on the total width from comparing ${{\mathit W}}{{\mathit W}^{(*)}}$ production via on-shell and off-shell ${{\mathit H}}$ using 4.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 19.4 fb${}^{-1}$ at 8 TeV.
13  KHACHATRYAN 2016BA combine the ${{\mathit W}}{{\mathit W}^{(*)}}$ result with ${{\mathit Z}}{{\mathit Z}^{(*)}}$ results of KHACHATRYAN 2015BA and KHACHATRYAN 2014D.
14  AAD 2015BE derive constraints on the total width from comparing ${{\mathit Z}}{{\mathit Z}^{(*)}}$ and ${{\mathit W}}{{\mathit W}^{(*)}}$ production via on-shell and off-shell ${{\mathit H}}$ using 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. The K factor for the background processes is assumed to be equal to that for the signal.
15  KHACHATRYAN 2015AM combine ${{\mathit \gamma}}{{\mathit \gamma}}$ and ${{\mathit Z}}$ ${{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ results. The expected limit is 2.3 GeV.
16  KHACHATRYAN 2015BA derive a lower limit on the total width from an upper limit on the decay flight distance $\tau $ $<$ $1.9 \times 10^{-13}$ s. 5.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 19.7 fb${}^{-1}$ at 8 TeV are used.
17  KHACHATRYAN 2015BA derive constraints on the total width from comparing ${{\mathit Z}}{{\mathit Z}^{(*)}}$ production via on-shell and off-shell ${{\mathit H}}$ with an unconstrained anomalous coupling. 4${{\mathit \ell}}$ final states in 5.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 19.7 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV are used.
18  AAD 2014W use 4.5 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 20.3 fb${}^{-1}$ at 8 TeV. The expected limit is 6.2 GeV.
19  CHATRCHYAN 2014AA use 5.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 19.7 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. The expected limit is 2.8 GeV.
20  KHACHATRYAN 2014D derive constraints on the total width from comparing ${{\mathit Z}}{{\mathit Z}^{(*)}}$ production via on-shell and off-shell ${{\mathit H}}$. 4${{\mathit \ell}}$ and ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit \nu}}$ final states in 5.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 19.7 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV are used.
21  KHACHATRYAN 2014P use 5.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 19.7 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. The expected limit is 3.1 GeV.
  References:
AAD 2025AQ
RPP 88 057803
AAD 2025AV
PL B870 139898 Constraining off-shell Higgs boson production and the Higgs boson total width using $WW\to \ell?\ell?$ final states with the ATLAS detector
AAD 2025E
PL B861 139277 Constraint on the total width of the Higgs boson from Higgs boson and four-top-quark measurements in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
HAYRAPETYAN 2025L
PR D111 092014 Measurement of the Higgs boson mass and width using the four-lepton final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV
AAD 2023BR
PL B846 138223 Evidence of off-shell Higgs boson production from $ZZ$ leptonic decay channels and constraints on its total width with the ATLAS detector
Also
PL B854 138734 (errat.) Evidence of off-shell Higgs boson production from $Z Z$ leptonic decay channels and constraints on its total width with the ATLAS detector
Also
PL B865 139449 (errat.) Evidence of off-shell Higgs boson production from $ZZ$ leptonic decay channels and constraints on its total width with the ATLAS detector
TUMASYAN 2022AM
NATP 18 1329 Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production
SIRUNYAN 2019BL
PR D99 112003 Measurements of the Higgs boson width and anomalous $HVV$ couplings from on-shell and off-shell production in the four-lepton final state
AABOUD 2018BP
PL B786 223 Constraints on off-shell Higgs boson production and the Higgs boson total width in $ZZ\to4\ell$ and $ZZ\to2\ell2\nu$ final states with the ATLAS detector
SIRUNYAN 2017AV
JHEP 1711 047 Measurements of Properties of the Higgs Boson Decaying into the Four-Lepton Final State in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 13 TeV
KHACHATRYAN 2016BA
JHEP 1609 051 Search for Higgs Boson Off-shell Production in Proton-Proton Collisions at 7 and 8 TeV and Derivation of Constraints on its Total Decay Width
AAD 2015BE
EPJ C75 335 Constraints on the Off-Shell Higgs Boson Signal Strength in the High-Mass ${{\mathit Z}}{{\mathit Z}}$ and ${{\mathit W}}{{\mathit W}}$ Final States with the ATLAS Detector
KHACHATRYAN 2015BA
PR D92 072010 Limits on the Higgs Boson Lifetime and Width from its Decay to Four Charged Leptons
KHACHATRYAN 2015AM
EPJ C75 212 Precise Determination of the Mass of the Higgs Boson and Tests of Compatibility of its Couplings with the Standard Model Predictions using Proton Collisions at 7 and 8 TeV
AAD 2014W
PR D90 052004 Measurement of the Higgs Boson Mass from the ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ and ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit Z}^{*}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ Channels with the ATLAS Detector using 25 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ Collision Data
CHATRCHYAN 2014AA
PR D89 092007 Measurement of the Properties of a Higgs Boson in the Four-Lepton Final State
KHACHATRYAN 2014D
PL B736 64 Constraints on the Higgs Boson Width from off-Shell Production and Decay to ${{\mathit Z}}$-Boson Pairs
KHACHATRYAN 2014P
EPJ C74 3076 Observation of the Diphoton Decay of the Higgs Boson and Measurement of its Properties