#### ${{\mathit H}^{0}}$ SIGNAL STRENGTHS IN DIFFERENT CHANNELS

The ${{\mathit H}^{0}}$ 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( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit x}}{{\mathit x}}$ ) $/$ ($\sigma$ $\cdot{}$ B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit x}}{{\mathit x}}$ ))$_{{\mathrm {SM}}}$, for the specified mass value of ${{\mathit H}^{0}}$ . For the SM predictions, see DITTMAIER 2011 , DITTMAIER 2012 , and HEINEMEYER 2013A. Results for fiducial and differential cross sections are also listed below.

#### ${{\mathit \gamma}^{*}}{{\mathit \gamma}}$ Final State

VALUE CL% DOCUMENT ID TECN  COMMENT
$1.5$ $\pm0.5$ ${}^{+0.2}_{-0.1}$ 1
 2021 I
ATLS ${{\mathit p}}{{\mathit p}}$ , 13 TeV, ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \gamma}}$ , 139 fb${}^{-1}$
• • We do not use the following data for averages, fits, limits, etc. • •
$<4.0$ 95 2
 2018 DQ
CMS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit X}}$ , 13 TeV, ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}^{*}}{{\mathit \gamma}}$
$<6.7$ 95 3
 2016 B
CMS ${{\mathit p}}{{\mathit p}}$ , 8 TeV, ${{\mathit e}}{{\mathit e}}{{\mathit \gamma}}$ , ${{\mathit \mu}}{{\mathit \mu}}{{\mathit \gamma}}$
 1 AAD 2021I search for ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \gamma}}$ (${{\mathit \ell}}$ = ${{\mathit e}}$ , ${{\mathit \mu}}$ ) in 139 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The mass of dilepton ${{\mathit m}}$ $_{ {{\mathit \ell}} {{\mathit \ell}} }$ is smaller than 30 GeV. This region is dominated by the decay through ${{\mathit \gamma}^{*}}$ . The quoted signal strength corresponds to a significance of 3.2 standard deviations and is given for ${\mathit m}_{{{\mathit H}^{0}}}$ = 125.09 GeV. The cross section times the branching ratio of ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \gamma}}$ for ${{\mathit m}}$ $_{ {{\mathit \ell}} {{\mathit \ell}} }<$ 30 GeV is measured to be $8.7$ $\pm2.7$ ${}^{+0.7}_{-0.6}$ fb.
 2 SIRUNYAN 2018DQ search for ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}^{*}}{{\mathit \gamma}}$ , ${{\mathit \gamma}^{*}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit \mu}}$ in 35.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The mass of ${{\mathit \gamma}^{*}}$ is smaller than 50 GeV except in ${{\mathit J / \psi}}$ and ${{\mathit \Upsilon}}$ mass regions. The quoted signal strength (see their Figs. 6 and 7) is given for ${\mathit m}_{{{\mathit H}^{0}}}$ = 125 GeV.
 3 KHACHATRYAN 2016B search for ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}^{*}}{{\mathit \gamma}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}}$ and ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \gamma}}$ (with m( ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ) $<$ 3.5 GeV and m( ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) $<$ 20 GeV) in 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 6 for limits on individual channels.
References:
 AAD 2021I
PL B819 136412 Evidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at 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
 KHACHATRYAN 2016B
PL B753 341 Search for a Higgs Boson Decaying into ${{\mathit \gamma}^{*}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \gamma}}$ with Low Dilepton Mass in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV