1AAD 2024BQ search for ${{\mathit X}^{0}}$ production via ${{\mathit H}}$ $\rightarrow$ ${{\mathit X}^{0}}{{\mathit X}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV. See their Fig. 10 for limits on $\sigma \cdot{}B$.
2HAYRAPETYAN 2024AA search for ${{\mathit X}^{0}}$ production via ${{\mathit H}{(125)}}$ $\rightarrow$ ${{\mathit X}^{0}}{{\mathit X}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV. See their Fig. 3 for limits on $\sigma \cdot{}B$.
3AAD 2022J search for ${{\mathit X}^{0}}$ production via ${{\mathit H}{(125)}}$ $\rightarrow$ ${{\mathit X}^{0}}{{\mathit X}^{0}}$ $/$ ${{\mathit Z}}{{\mathit X}^{0}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV. ${{\mathit X}^{0}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ decay is assumed. See their Fig. 13 and Fig. 17 for limits on $\sigma \cdot{}B$ in ${{\mathit H}{(125)}}$ $\rightarrow$ ${{\mathit X}^{0}}{{\mathit X}^{0}}$ and ${{\mathit H}{(125)}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit X}^{0}}$ channels.
4AABOUD 2018AP use ${{\mathit p}}{{\mathit p}}$ collision data at $\sqrt {s }$ = 13 TeV. ${{\mathit X}^{0}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ decay is assumed. See their Fig. 9 for limits on $\sigma _{{{\mathit H}{(125)}}}\cdot{}B({{\mathit Z}}{{\mathit X}^{0}}$).
5AABOUD 2018AP use ${{\mathit p}}{{\mathit p}}$ collision data at $\sqrt {s }$ = 13 TeV. ${{\mathit X}^{0}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ decay is assumed. See their Fig. 10 for limits on $\sigma _{{{\mathit H}{(125)}}}\cdot{}B({{\mathit X}^{0}}{{\mathit X}^{0}}$).
References:
AAD
2024BQ
PR D110 052013
Search for decays of the Higgs boson into a pair of pseudoscalar particles decaying into $b\bar{b}\tau^+\tau^-$ using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
HAYRAPETYAN
2024AA
JHEP 2406 097
Search for the decay of the Higgs boson to a pair of light pseudoscalar bosons in the final state with four bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
AAD
2022J
JHEP 2203 041
Search for Higgs bosons decaying into new spin-0 or spin-1 particles in four-lepton final states with the ATLAS detector with 139 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV
AABOUD
2018AP
JHEP 1806 166
Search for Higgs boson decays to beyond-the-Standard-Model light bosons in four-lepton events with the ATLAS detector at $\sqrt{s}=13$ TeV
