${{\mathit H}}$ SIGNAL STRENGTHS IN DIFFERENT CHANNELS

The ${{\mathit H}}$ signal strength in a particular final state ${{\mathit x}}{{\mathit x}}$ is given by the cross section times branching ratio in this channel normalized to the Standard Model (SM) value, $\sigma $ $\cdot{}$ B( ${{\mathit H}}$ $\rightarrow$ ${{\mathit x}}{{\mathit x}}$) $/$ ($\sigma $ $\cdot{}$ B( ${{\mathit H}}$ $\rightarrow$ ${{\mathit x}}{{\mathit x}}))_{{\mathrm {SM}}}$, for the specified mass value of ${{\mathit H}}$. For the SM predictions, see DITTMAIER 2011, DITTMAIER 2012, and HEINEMEYER 2013A. Results for fiducial and differential cross sections are also listed below.

${{\mathit Z}}{{\mathit \gamma}}$ final state INSPIRE search

S126SZG
VALUE CL% DOCUMENT ID TECN  COMMENT
$2.2$ $\pm0.7$ 1
AAD
2024D
 LHC ${{\mathit p}}{{\mathit p}}$, 13 TeV
• • • We do not use the following data for averages, fits, limits, etc. • • •
$2.4$ $\pm0.9$ 2
TUMASYAN
2023F
 CMS ${{\mathit p}}{{\mathit p}}$, 13 TeV
$2.59$ ${}^{+1.07}_{-0.96}$ 3
CMS
2022
CMS ${{\mathit p}}{{\mathit p}}$, 13 TeV
$<3.6$ 95 4
AAD
2020AG
 ATLS ${{\mathit p}}{{\mathit p}}$, 13 TeV
$<7.4$ 95 5
SIRUNYAN
2018DQ
 CMS ${{\mathit p}}{{\mathit p}}$, 13 TeV
$<6.6$ 95 6
AABOUD
2017AW
 ATLS ${{\mathit p}}{{\mathit p}}$, 13 TeV
$<11$ 95 7
AAD
2014J
 ATLS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV
$<9.5$ 95 8
CHATRCHYAN
2013BK
 CMS ${{\mathit p}}{{\mathit p}}$, 7, 8 TeV
1  AAD 2024D report combined results of ATLAS (AAD 2020AG) and CMS (TUMASYAN 2023F). The reported signal strength corresponds to a significance of 3.4 $\sigma $.
2  TUMASYAN 2023F search for ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$, ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit e}}$ , ${{\mathit \mu}}{{\mathit \mu}}$ in 138 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV, assuming ${\mathit m}_{{{\mathit H}}}$ = 125.38 GeV. ${\mathit \sigma (}$ ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}}{)}\cdot{}$B( ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$) is measured to be $0.21$ $\pm0.08$ pb. The ratio of branching fractions B( ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$)/B( ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$) is measured to be $1.5$ ${}^{+0.7}_{-0.6}$.
3  CMS 2022 report combined results (see their Extended Data Table 2) using up to 138 fb${}^{-1}$ of data at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV, assuming ${\mathit m}_{{{\mathit H}}}$ = 125.38 GeV. See their Fig. 2 right.
4  AAD 2020AG search for ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$, ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit e}}$ , ${{\mathit \mu}}{{\mathit \mu}}$ in 139 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The signal strength is $2.0$ $\pm0.9$ ${}^{+0.4}_{-0.3}$ at ${\mathit m}_{{{\mathit H}}}$ = 125.09 GeV, which corresponds to a significance of 2.2 $\sigma $. The upper limit of ${\mathit \sigma (}$ ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}}{)}\cdot{}$B( ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$) is 305 fb at 95$\%$ CL.
5  SIRUNYAN 2018DQ search for ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$, ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit e}}$ , ${{\mathit \mu}}{{\mathit \mu}}$ in 35.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The quoted signal strength (see their Figs. 6 and 7) is given for ${\mathit m}_{{{\mathit H}}}$ = 125 GeV.
6  AABOUD 2017AW search for ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$, ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit e}}$ , ${{\mathit \mu}}{{\mathit \mu}}$ in 36.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The quoted signal strength is given for ${\mathit m}_{{{\mathit H}}}$ = 125.09 GeV. The upper limit on the branching ratio of ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$ is 1.0$\%$ at 95$\%$ CL assuming the SM Higgs boson production.
7  AAD 2014J search for ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \gamma}}$ in 4.5 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 20.3 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. The quoted signal strength is given for ${\mathit m}_{{{\mathit H}}}$ = 125.5 GeV.
8  CHATRCHYAN 2013BK search for ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \ell}}$ ${{\mathit \ell}}{{\mathit \gamma}}$ in 5.0 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 19.6 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. A limit on cross section times branching ratio which corresponds to ($4 - 25$) times the expected Standard Model cross section is given in the range ${\mathit m}_{{{\mathit H}}}$ = $120 - 160$ GeV at 95$\%$ CL. The quoted limit is given for ${\mathit m}_{{{\mathit H}}}$ = 125 GeV, where 10 is expected for no signal.
  References:
AAD 2024D
PRL 132 021803 Evidence for the Higgs boson decay to a $Z$ boson and a photon at the LHC
TUMASYAN 2023F
JHEP 2305 233 Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at $ \sqrt{s} $ = 13 TeV
CMS 2022
NAT 607 60 A portrait of the Higgs boson by the CMS experiment ten years after the discovery
AAD 2020AG
PL B809 135754 A search for the $Z\gamma$ decay mode of the Higgs boson in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
SIRUNYAN 2018DQ
JHEP 1811 152 Search for the decay of a Higgs boson in the $\ell\ell\gamma$ channel in proton-proton collisions at $\sqrt{s} =$ 13 TeV
AABOUD 2017AW
JHEP 1710 112 Searches for the ${{\mathit Z}}{{\mathit \gamma}}$ Decay Mode of the Higgs Boson and for New High-Mass Resonances in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 13 TeV with the ATLAS Detector
AAD 2014J
PL B732 8 Search for Higgs Boson Decays to a Photon and a ${{\mathit Z}}$ Boson in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 and 8 TeV with the ATLAS Detector
CHATRCHYAN 2013BK
PL B726 587 Search for a Higgs Boson Decaying into a ${{\mathit Z}}$ and a Photon in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 and 8 TeV