#### Search for ${{\mathit X}^{0}}$ Resonance in ${{\mathit H}{(125)}}$ Decays

Spin 1 is assumed for ${{\mathit X}^{0}}$ . See neutral Higgs search listing for pseudoscalar ${{\mathit X}^{0}}$ .
VALUE DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
1
 2018 AP
ATLS ${{\mathit H}{(125)}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit X}^{0}}$
2
 2018 AP
ATLS ${{\mathit H}{(125)}}$ $\rightarrow$ ${{\mathit X}^{0}}{{\mathit X}^{0}}$
 1 AABOUD 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( ${{\mathit Z}}{{\mathit X}^{0}}$ ).
 2 AABOUD 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:
 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