MASS LIMITS FOR NEUTRAL HIGGS BOSONS IN EXTENDED HIGGS MODELS

This Section covers models which do not fit into either the Standard Model or its simplest minimal Supersymmetric extension (MSSM), leading to anomalous production rates, or nonstandard final states and branching ratios. In particular, this Section covers limits which may apply to generic two-Higgs-doublet models (2HDM), or to special regions of the MSSM parameter space where decays to invisible particles or to photon pairs are dominant (see the review on ``Status of Higgs Boson Physics''). Concerning the mass limits for ${{\mathit H}^{0}}$ and ${{\mathit A}^{0}}$ listed below, see the footnotes or the comment lines for details on the nature of the models to which the limits apply.
The observed signal at about 125 GeV, see section ``${{\mathit H}^{0}}$'', can be interpreted as one of the neutral Higgs bosons of an extended Higgs sector.

Other Mass Limits INSPIRE search

We use a symbol ${{\mathit H}_{{1}}^{0}}$ if mass $<$ 125 GeV or ${{\mathit H}_{{2}}^{0}}$ if mass $>$ 125 GeV. The notation ${{\mathit H}^{0}}$ is reserved for the 125 GeV particle.

VALUE (GeV) CL% DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
1
SIRUNYAN
2018F
 CMS ${{\mathit p}}{{\mathit p}}$ , 13 TeV, ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
2
AABOUD
2017
ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$
3
AABOUD
2017AW
 ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$
4
KHACHATRYAN
2017D
 CMS ${{\mathit p}}{{\mathit p}}$ , 8, 13 TeV, ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$
5
KHACHATRYAN
2017R
 CMS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
6
SIRUNYAN
2017CN
 CMS ${{\mathit p}}{{\mathit p}}$ , 8 TeV, ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
7
SIRUNYAN
2017Y
 CMS ${{\mathit p}}{{\mathit p}}$ , 8, 13 TeV, ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$
8
AABOUD
2016AB
 ATLS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$
9
AABOUD
2016AE
 ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit W}^{+}}{{\mathit W}^{-}}$ , ${{\mathit Z}}{{\mathit Z}}$
10
AABOUD
2016H
 ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
11
AABOUD
2016I
 ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
12
AAD
2016AX
 ATLS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit Z}}$
13
AAD
2016C
 ATLS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit W}^{+}}{{\mathit W}^{-}}$
14
AAD
2016L
 ATLS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$
15
AAD
2016L
 ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$
16
AALTONEN
2016C
 CDF ${{\mathit H}_{{1}}^{0}}$ ${{\mathit H}^{\pm}}$ $\rightarrow$ ${{\mathit H}_{{1}}^{0}}{{\mathit H}_{{1}}^{0}}{{\mathit W}^{*}}$ , ${{\mathit H}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
17
KHACHATRYAN
2016BG
 CMS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
18
KHACHATRYAN
2016BQ
 CMS ${{\mathit p}}{{\mathit p}}$ , 8 TeV, ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
19
KHACHATRYAN
2016F
 CMS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit H}_{{1}}^{0}}{{\mathit H}_{{1}}^{0}}$
20
KHACHATRYAN
2016M
 CMS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
21
KHACHATRYAN
2016P
 CMS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
22
KHACHATRYAN
2016P
 CMS ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit H}^{0}}$
23
AAD
2015BK
 ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
24
AAD
2015BZ
 ATLS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$
25
AAD
2015BZ
 ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$
26
AAD
2015CE
 ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
27
AAD
2015H
 ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
28
AAD
2015S
 ATLS ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit H}^{0}}$
29
KHACHATRYAN
2015AW
 CMS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit W}^{+}}{{\mathit W}^{-}}$ , ${{\mathit Z}}{{\mathit Z}}$
30
KHACHATRYAN
2015BB
 CMS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
31
KHACHATRYAN
2015N
 CMS ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit H}^{0}}$
32
KHACHATRYAN
2015O
 CMS ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit H}^{0}}$
33
KHACHATRYAN
2015R
 CMS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
34
AAD
2014AP
 ATLS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
35
AAD
2014M
 ATLS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{\pm}}{{\mathit W}^{\mp}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit W}^{\pm}}{{\mathit W}^{\mp}}$ , ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$
36
CHATRCHYAN
2014G
 CMS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit W}}{{\mathit W}^{(*)}}$
37
KHACHATRYAN
2014P
 CMS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
38
AALTONEN
2013P
 CDF ${{\mathit H}^{'0}}$ $\rightarrow$ ${{\mathit H}^{\pm}}{{\mathit W}^{\mp}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit W}^{+}}{{\mathit W}^{-}}$
39
CHATRCHYAN
2013BJ
 CMS ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$
40
AALTONEN
2011P
 CDF ${{\mathit t}}$ $\rightarrow$ ${{\mathit b}}{{\mathit H}^{+}}$ , ${{\mathit H}^{+}}$ $\rightarrow$ ${{\mathit W}^{+}}{{\mathit A}^{0}}$
41
ABBIENDI
2010
OPAL ${{\mathit H}^{0}}$ $\rightarrow$ ${{\widetilde{\mathit \chi}}_{{1}}^{0}}{{\widetilde{\mathit \chi}}_{{2}}^{0}}$
42
SCHAEL
2010
ALEP ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$
43
ABAZOV
2009V
 D0 ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$
$\text{none 3 - 63}$ 95 44
ABBIENDI
2005A
 OPAL ${{\mathit A}^{0}}$, Type II model
$>104$ 95 45
ABBIENDI
2004K
 OPAL ${{\mathit H}^{0}}$ $\rightarrow$ 2 jets
46
ABDALLAH
2004
DLPH ${{\mathit H}^{0}}{{\mathit V}}{{\mathit V}}$ couplings
$>110.3$ 95 47
ACHARD
2004B
 L3 ${{\mathit H}^{0}}$ $\rightarrow$ 2 jets
48
ACHARD
2004F
 L3 Anomalous coupling
49
ABBIENDI
2003F
 OPAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit Z}}$ , ${{\mathit H}^{0}}$ $\rightarrow$ any
50
ABBIENDI
2003G
 OPAL ${{\mathit H}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$
$>105.4$ 95 51, 52
HEISTER
2002L
 ALEP ${{\mathit H}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
$>109.1$ 95 53
HEISTER
2002M
 ALEP ${{\mathit H}^{0}}$ $\rightarrow$ 2 jets or ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$
$\text{none 12 - 56}$ 95 54
ABBIENDI
2001E
 OPAL ${{\mathit A}^{0}}$, Type-II model
55
ACCIARRI
2000R
 L3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit \gamma}}$ and/or ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
56
ACCIARRI
2000R
 L3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit H}^{0}}$
57
GONZALEZ-GARC..
1998B
 RVUE Anomalous coupling
58
KRAWCZYK
1997
RVUE ($\mathit g-2)_{{{\mathit \mu}}}$
59
ALEXANDER
1996H
 OPAL ${{\mathit Z}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit \gamma}}$
1  SIRUNYAN 2018F search for a narrow scalar resonance decaying to ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit W}}{{\mathit W}}$ ${{\mathit b}}{{\overline{\mathit b}}}$ or ${{\mathit Z}}{{\mathit Z}}{{\mathit b}}{{\overline{\mathit b}}}$ in the final state ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit \nu}}{{\mathit b}}{{\overline{\mathit b}}}$ in 35.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 7 for limits on cross section times branching ratios for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $250 - 900$ GeV.
2  AABOUD 2017 search for production of a scalar resonance decaying to ${{\mathit Z}}{{\mathit \gamma}}$ in 3.2 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 4 for the limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.25 - 3.0$ TeV.
3  AABOUD 2017AW search for production of a scalar resonance decaying to ${{\mathit Z}}{{\mathit \gamma}}$ in 36.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 7 for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.25 - 2.4$ TeV.
4  KHACHATRYAN 2017D search for production of a scalar resonance decaying to ${{\mathit Z}}{{\mathit \gamma}}$ in 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV and 2.7 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Figs. 3 and 4 for the limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.2 - 2.0$ TeV.
5  KHACHATRYAN 2017R search for production of a narrow scalar resonance decaying to ${{\mathit \gamma}}{{\mathit \gamma}}$ in 12.9 fb${}^{-1}$ (taken in 2016) of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 2 for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.5 - 4.5$ TeV for several values of its width-to-mass ratio. Limits from combination with KHACHATRYAN 2016M are shown in their Figs. 4 and 6.
6  SIRUNYAN 2017CN search for a narrow scalar resonance decaying to ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 18.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 5 (above) and Table II for limits on the cross section times branching ratios for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.3 - 1$ TeV, and Fig. 6 (above) and Table III for the corresponding limits by combining with data from KHACHATRYAN 2016BQ and KHACHATRYAN 2015R.
7  SIRUNYAN 2017Y search for production of a scalar resonance decaying to ${{\mathit Z}}{{\mathit \gamma}}$ in 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV and 2.7 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Figs. 3, 4 and Table 3 for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.7 - 3.0$ TeV, and Fig. 5 for the corresponding limits for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.2 - 3.0$ TeV from combination with KHACHATRYAN 2017D data.
8  AABOUD 2016AB search for associated production of ${{\mathit W}}{{\mathit H}^{0}}$ with the decay ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ in 3.2 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 8 for limits on cross section times branching ratios for ${\mathit m}_{{{\mathit A}^{0}}}$ = $20 - 60$ GeV.
9  AABOUD 2016AE search for production of a narrow scalar resonance decaying to ${{\mathit W}^{+}}{{\mathit W}^{-}}$ and ${{\mathit Z}}{{\mathit Z}}$ in 3.2 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 4 for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.5 - 3$ TeV.
10  AABOUD 2016H search for production of a scalar resonance decaying to ${{\mathit \gamma}}{{\mathit \gamma}}$ in 3.2 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 12 for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.2 - 2$ TeV with different assumptions on the width.
11  AABOUD 2016I search for a narrow scalar resonance decaying to ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ in 3.2 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 10(c) for limits on cross section times branching ratios for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.5 - 3$ TeV.
12  AAD 2016AX search for production of a heavy ${{\mathit H}^{0}}$ state decaying to ${{\mathit Z}}{{\mathit Z}}$ in the final states ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ , ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit \nu}}{{\overline{\mathit \nu}}}$ , ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit q}}{{\overline{\mathit q}}}$ , and ${{\mathit \nu}}{{\overline{\mathit \nu}}}{{\mathit q}}{{\overline{\mathit q}}}$ in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig.12 for upper limits on ${\mathit \sigma (}{{\mathit H}^{0}}{)}$ B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit Z}}$ ) for ${\mathit m}_{{{\mathit H}^{0}}}$ ranging from 140 GeV to 1000 GeV.
13  AAD 2016C search for production of a heavy ${{\mathit H}^{0}}$ state decaying to ${{\mathit W}^{+}}{{\mathit W}^{-}}$ in the final states ${{\mathit \ell}}{{\mathit \nu}}{{\mathit \ell}}{{\mathit \nu}}$ and ${{\mathit \ell}}{{\mathit \nu}}{{\mathit q}}{{\mathit q}}$ in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Figs. 12, 13, and 16 for upper limits on ${\mathit \sigma (}{{\mathit H}^{0}}{)}$ B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit W}^{+}}{{\mathit W}^{-}}$ ) for ${\mathit m}_{{{\mathit H}^{0}}}$ ranging from 300 GeV to 1000 or 1500 GeV with various assumptions on the total width of ${{\mathit H}^{0}}$.
14  AAD 2016L search for the decay ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \gamma}}$ in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 4 (upper right) for limits on cross section times branching ratios (normalized to the SM ${{\mathit H}^{0}}$ cross section) for ${\mathit m}_{{{\mathit A}^{0}}}$ = $10 - 60$ GeV.
15  AAD 2016L search for the decay ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \gamma}}$ in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 4 (lower right) for limits on cross section times branching ratios for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = 600 GeV and ${\mathit m}_{{{\mathit A}^{0}}}$ = $10 - 245$ GeV, and Table 5 for limits for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$= 300 and 900 GeV.
16  AALTONEN 2016C search for electroweak associated production of ${{\mathit H}_{{1}}^{0}}{{\mathit H}^{\pm}}$ followed by the decays ${{\mathit H}^{\pm}}$ $\rightarrow$ ${{\mathit H}_{{1}}^{0}}{{\mathit W}^{*}}$ , ${{\mathit H}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ for ${\mathit m}_{{{\mathit H}_{{1}}^{0}}}$ = $10 - 105$ GeV and ${\mathit m}_{{{\mathit H}^{\pm}}}$ = $30 - 300$ GeV. See their Fig. 3 for excluded parameter region in a two-doublet model in which ${{\mathit H}_{{1}}^{0}}$ has no direct decay to fermions.
17  KHACHATRYAN 2016BG search for a narrow scalar resonance decaying to ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ 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 the cross section times branching ratios for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $1.15 - 3$ TeV.
18  KHACHATRYAN 2016BQ search for a resonance decaying to ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ in 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 9 for limits on the cross section times branching ratios for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.26 - 1.1$ TeV.
19  KHACHATRYAN 2016F search for the decay ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit H}_{{1}}^{0}}{{\mathit H}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 19.7 fb${}^{-1}$ of ${{\mathit p}}$ ${{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 8 for cross section limits for ${\mathit m}_{{{\mathit H}_{{1}}^{0}}}$ = $4 - 8$ GeV.
20  KHACHATRYAN 2016M search for production of a narrow resonance decaying to ${{\mathit \gamma}}{{\mathit \gamma}}$ in 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV and 3.3 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 3 (top) for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.5 - 4$ TeV.
21  KHACHATRYAN 2016P search for gluon fusion production of an ${{\mathit H}_{{2}}^{0}}$ decaying to ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 8 (lower right) for cross section limits for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $260 - 350$ GeV.
22  KHACHATRYAN 2016P search for gluon fusion production of an ${{\mathit A}^{0}}$ decaying to ${{\mathit Z}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 10 for cross section limits for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $220 - 350$ GeV.
23  AAD 2015BK search for production of a heavy ${{\mathit H}_{{2}}^{0}}$ decaying to ${{\mathit H}^{0}}{{\mathit H}^{0}}$ in the final state ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ in 19.5 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 14(c) for ${\mathit \sigma (}{{\mathit H}_{{2}}^{0}}{)}$ B( ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ ) for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $500 - 1500$ GeV with ${\Gamma}_{{\mathit H}_{{2}}^{0}}$ = 1 GeV.
24  AAD 2015BZ search for the decay ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ (${\mathit m}_{{{\mathit H}^{0}}}$ = 125 GeV) in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 6 for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit A}^{0}}}$ = $3.7 - 50$ GeV.
25  AAD 2015BZ search for a state ${{\mathit H}_{{2}}^{0}}$ via the decay ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 6 for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $100 - 500$ GeV and ${\mathit m}_{{{\mathit A}^{0}}}$ = 5 GeV.
26  AAD 2015CE search for production of a heavy ${{\mathit H}_{{2}}^{0}}$ decaying to ${{\mathit H}^{0}}{{\mathit H}^{0}}$ in the final states ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ and ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit W}}{{\mathit W}^{*}}$ in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV and combine with data from AAD 2015H and AAD 2015BK. A limit ${\mathit \sigma (}{{\mathit H}_{{2}}^{0}}{)}$ B( ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ ) $<$ $2.1 - 0.011$ pb (95$\%$ CL) is given for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $260 - 1000$ GeV. See their Fig. 6.
27  AAD 2015H search for production of a heavy ${{\mathit H}_{{2}}^{0}}$ decaying to ${{\mathit H}^{0}}{{\mathit H}^{0}}$ in the finalstate ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV.A limit of ${\mathit \sigma (}{{\mathit H}_{{2}}^{0}}{)}$ B( ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ ) $<$ $3.5 - 0.7$ pb is given for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $260 - 500$ GeV at 95$\%$ CL. See their Fig. 3.
28  AAD 2015S search for production of ${{\mathit A}^{0}}$ decaying to ${{\mathit Z}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit \nu}}{{\overline{\mathit \nu}}}{{\mathit b}}{{\overline{\mathit b}}}$ and ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 3 for cross section limits for ${\mathit m}_{{{\mathit A}^{0}}}$ = $200 - 1000$ GeV.
29  KHACHATRYAN 2015AW search for production of a heavy state ${{\mathit H}_{{2}}^{0}}$ of an electroweak singlet extension of the Standard Model via the decays of ${{\mathit H}_{{2}}^{0}}$ to ${{\mathit W}^{+}}{{\mathit W}^{-}}$ and ${{\mathit Z}}{{\mathit Z}}$ in up to 5.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and up to 19.7 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV in the range ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $145 - 1000$ GeV. See their Figs. 8 and 9 for limits in the parameter space of the model.
30  KHACHATRYAN 2015BB search for production of a resonance ${{\mathit H}^{0}}$ decaying to ${{\mathit \gamma}}{{\mathit \gamma}}$ in 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 7 for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}^{0}}}$ = $150 - 850$ GeV.
31  KHACHATRYAN 2015N search for production of ${{\mathit A}^{0}}$ decaying to ${{\mathit Z}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit b}}{{\overline{\mathit b}}}$ in 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 3 for limits on cross section times branching ratios for ${\mathit m}_{{{\mathit A}^{0}}}$ = $225 - 600$ GeV.
32  KHACHATRYAN 2015O search for production of a high-mass narrow resonance ${{\mathit A}^{0}}$ decaying to ${{\mathit Z}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ 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 cross section times branching ratios for ${\mathit m}_{{{\mathit A}^{0}}}$ = $800 - 2500$ GeV.
33  KHACHATRYAN 2015R search for a narrow scalar resonance decaying to ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ in 17.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 5 (top) for limits on cross section times branching ratios for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = $0.27 - 1.1$ TeV.
34  AAD 2014AP search for a second ${{\mathit H}^{0}}$ state decaying to ${{\mathit \gamma}}{{\mathit \gamma}}$ in addition to the state at about 125 GeV in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 4 for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}^{0}}}$ = $65 - 600$ GeV.
35  AAD 2014M search for the decay cascade ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{\pm}}{{\mathit W}^{\mp}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit W}^{\pm}}{{\mathit W}^{\mp}}$ , ${{\mathit H}^{0}}$ decaying to ${{\mathit b}}{{\overline{\mathit b}}}$ in 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Table III for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$= $325 - 1025$ GeV and ${\mathit m}_{{{\mathit H}^{+}}}$= $225 - 925$ GeV.
36  CHATRCHYAN 2014G search for a second ${{\mathit H}^{0}}$ state decaying to ${{\mathit W}}{{\mathit W}^{(*)}}$ in addition to the observed signal at about 125 GeV using 4.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 19.4 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 21 (right) for cross section limits in the mass range $110 - 600$ GeV.
37  KHACHATRYAN 2014P search for a second ${{\mathit H}^{0}}$ state decaying to ${{\mathit \gamma}}{{\mathit \gamma}}$ in addition to the observed signal at about 125 GeV using 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. See their Figs. 27 and 28 for cross section limits in the mass range $110 - 150$ GeV.
38  AALTONEN 2013P search for production of a heavy Higgs boson ${{\mathit H}^{'0}}$ that decays into a charged Higgs boson ${{\mathit H}^{\pm}}$ and a lighter Higgs boson ${{\mathit H}^{0}}$ via the decay chain ${{\mathit H}^{'0}}$ $\rightarrow$ ${{\mathit H}^{\pm}}{{\mathit W}^{\mp}}$ , ${{\mathit H}^{\pm}}$ $\rightarrow$ ${{\mathit W}^{\pm}}{{\mathit H}^{0}}$ , ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ in the final state ${{\mathit \ell}}{{\mathit \nu}}$ plus 4 jets in 8.7 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. See their Fig. 4 for limits on cross section times branching ratio in the ${\mathit m}_{{{\mathit H}^{\pm}}}−{\mathit m}_{{{\mathit H}^{'0}}}$ plane for ${\mathit m}_{{{\mathit H}^{0}}}$ = 126 GeV.
39  CHATRCHYAN 2013BJ search for ${{\mathit H}^{0}}$ production in the decay chain ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ , ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ in 5.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. See their Fig. 2 for limits on cross section times branching ratio.
40  AALTONEN 2011P search in 2.7 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV for the decay chain ${{\mathit t}}$ $\rightarrow$ ${{\mathit b}}{{\mathit H}^{+}}$ , ${{\mathit H}^{+}}$ $\rightarrow$ ${{\mathit W}^{+}}{{\mathit A}^{0}}$ , ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ with ${\mathit m}_{{{\mathit A}^{0}}}$ between 4 and 9 GeV. See their Fig.$~$4 for limits on B( ${{\mathit t}}$ $\rightarrow$ ${{\mathit b}}{{\mathit H}^{+}}$ ) for 90 $<$ ${\mathit m}_{{{\mathit H}^{+}}}<$ 160 GeV.
41  ABBIENDI 2010 search for ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit H}^{0}}$ with the decay chain ${{\mathit H}^{0}}$ $\rightarrow$ ${{\widetilde{\mathit \chi}}_{{1}}^{0}}{{\widetilde{\mathit \chi}}_{{2}}^{0}}$ , ${{\widetilde{\mathit \chi}}_{{2}}^{0}}$ $\rightarrow$ ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ + (${{\mathit \gamma}}$ or ${{\mathit Z}^{*}}$), when ${{\widetilde{\mathit \chi}}_{{1}}^{0}}$ and ${{\widetilde{\mathit \chi}}_{{2}}^{0}}$ are nearly degenerate. For a mass difference of 2 (4) GeV, a lower limit on ${\mathit m}_{{{\mathit H}^{0}}}$ of 108.4 (107.0) GeV (95$\%$ CL) is obtained for SM ${{\mathit Z}}{{\mathit H}^{0}}$ cross section and B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\widetilde{\mathit \chi}}_{{1}}^{0}}{{\widetilde{\mathit \chi}}_{{2}}^{0}}$ ) = 1.
42  SCHAEL 2010 search for the process ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit Z}}$ followed by the decay chain ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ with ${{\mathit Z}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ , ${{\mathit \nu}}{{\overline{\mathit \nu}}}$ at $\mathit E_{{\mathrm {cm}}}$ = $183 - 209$ GeV. For a ${{\mathit H}^{0}}{{\mathit Z}}{{\mathit Z}}$ coupling equal to the SM value, B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ ) = B( ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ ) = 1, and ${\mathit m}_{{{\mathit A}^{0}}}$ = $4 - 10$ GeV, ${\mathit m}_{{{\mathit H}^{0}}}$ up to 107 GeV is excluded at 95$\%$ CL.
43  ABAZOV 2009V search for ${{\mathit H}^{0}}$ production followed by the decay chain ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ or ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 4.2 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. See their Fig. 3 for limits on $\sigma ({{\mathit H}^{0}})\cdot{}$B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ ) for ${\mathit m}_{{{\mathit A}^{0}}}$ = $3.6 - 19$ GeV.
44  ABBIENDI 2005A search for ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}_{{1}}^{0}}{{\mathit A}^{0}}$ in general Type-II two-doublet models, with decays ${{\mathit H}_{{1}}^{0}}$, ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$ , ${{\mathit g}}{{\mathit g}}$ , ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ , and ${{\mathit H}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ .
45  ABBIENDI 2004K search for ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit Z}}$ with ${{\mathit H}^{0}}$ decaying to two jets of any flavor including ${{\mathit g}}{{\mathit g}}$ . The limit is for SM production cross section with B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit j}}{{\mathit j}}$ ) = 1.
46  ABDALLAH 2004 consider the full combined LEP and LEP2 datasets to set limits on the Higgs coupling to ${{\mathit W}}$ or ${{\mathit Z}}$ bosons, assuming SM decays of the Higgs. Results in Fig. 26.
47  ACHARD 2004B search for ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit Z}}$ with ${{\mathit H}^{0}}$ decaying to ${{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit c}}{{\overline{\mathit c}}}$ , or ${{\mathit g}}{{\mathit g}}$ . The limit is for SM production cross section with B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit j}}{{\mathit j}}$ ) = 1.
48  ACHARD 2004F search for ${{\mathit H}^{0}}$ with anomalous coupling to gauge boson pairs in the processes ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit \gamma}}$ , ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit H}^{0}}$ , ${{\mathit H}^{0}}{{\mathit Z}}$ with decays ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit f}}{{\overline{\mathit f}}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}$ , ${{\mathit Z}}{{\mathit \gamma}}$ , and ${{\mathit W}^{*}}{{\mathit W}}$ at $\mathit E_{{\mathrm {cm}}}$ = $189 - 209$ GeV. See paper for limits.
49  ABBIENDI 2003F search for ${{\mathit H}^{0}}$ $\rightarrow$ anything in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit Z}}$ , using the recoil mass spectrum of ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ or ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ . In addition, it searched for ${{\mathit Z}}$ $\rightarrow$ ${{\mathit \nu}}{{\overline{\mathit \nu}}}$ and ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ or photons. Scenarios with large width or continuum ${{\mathit H}^{0}}$ mass distribution are considered. See their Figs. 11--14 for the results.
50  ABBIENDI 2003G search for ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}_{{1}}^{0}}{{\mathit Z}}$ followed by ${{\mathit H}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$ , ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit c}}{{\overline{\mathit c}}}$ , ${{\mathit g}}{{\mathit g}}$ , or ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in the region ${\mathit m}_{{{\mathit H}_{{1}}^{0}}}$ = 45-86 GeV and ${\mathit m}_{{{\mathit A}^{0}}}$ = 2-11 GeV. See their Fig. 7 for the limits.
51  Search for associated production of a ${{\mathit \gamma}}{{\mathit \gamma}}$ resonance with a ${{\mathit Z}}~$boson, followed by ${{\mathit Z}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$ , ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ , or ${{\mathit \nu}}{{\overline{\mathit \nu}}}$ , at $\mathit E_{{\mathrm {cm}}}{}\leq{}$209 GeV. The limit is for a ${{\mathit H}^{0}}$ with SM production cross section and B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit f}}{{\overline{\mathit f}}}$ )=0 for all fermions ${{\mathit f}}$.
52  For B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ )=1, ${\mathit m}_{{{\mathit H}^{0}}}>113.1$ GeV is obtained.
53  HEISTER 2002M search for ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit Z}}$ , assuming that ${{\mathit H}^{0}}$ decays to ${{\mathit q}}{{\overline{\mathit q}}}$ , ${{\mathit g}}{{\mathit g}}$ , or ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ only. The limit assumes SM production cross section.
54  ABBIENDI 2001E search for neutral Higgs bosons in general Type-II two-doublet models, at $\mathit E_{{\mathrm {cm}}}{}\leq{}$189 GeV. In addition to usual final states, the decays ${{\mathit H}_{{1}}^{0}}$, ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$ , ${{\mathit g}}{{\mathit g}}$ are searched for. See their Figs.$~$15,16 for excluded regions.
55  ACCIARRI 2000R search for ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit \gamma}}$ with ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit Z}}{{\mathit \gamma}}$ , or ${{\mathit \gamma}}{{\mathit \gamma}}$ . See their Fig.$~$3 for limits on $\sigma \cdot{}$B. Explicit limits within an effective interaction framework are also given, for which the Standard Model Higgs search results are used in addition.
56  ACCIARRI 2000R search for the two-photon type processes ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit H}^{0}}$ with ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ or ${{\mathit \gamma}}{{\mathit \gamma}}$ . See their Fig.$~$4 for limits on $\Gamma\mathrm {( {{\mathit H}^{0}} \rightarrow {{\mathit \gamma}} {{\mathit \gamma}} )}\cdot{}$B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ or ${{\mathit b}}{{\overline{\mathit b}}}$ ) for ${\mathit m}_{{{\mathit H}^{0}}}=70 - 170$ GeV.
57  GONZALEZ-GARCIA 1998B use ${D0}$ limit for ${{\mathit \gamma}}{{\mathit \gamma}}$ events with missing $\mathit E_{\mathit T}$ in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions (ABBOTT 1998 ) to constrain possible ${{\mathit Z}}{{\mathit H}}$ or ${{\mathit W}}{{\mathit H}}$ production followed by unconventional ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ decay which is induced by higher-dimensional operators. See their Figs.$~$1 and$~$2 for limits on the anomalous couplings.
58  KRAWCZYK 1997 analyse the muon anomalous magnetic moment in a two-doublet Higgs model (with type$~$II Yukawa couplings) assuming no ${{\mathit H}_{{1}}^{0}}{{\mathit Z}}{{\mathit Z}}$ coupling and obtain ${\mathit m}_{{{\mathit H}_{{1}}^{0}}}{ {}\gtrsim{} }5$ GeV or ${\mathit m}_{{{\mathit A}^{0}}}{ {}\gtrsim{} }5$ GeV for tan $\beta >50$. Other Higgs bosons are assumed to be much heavier.
59  ALEXANDER 1996H give B( ${{\mathit Z}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit \gamma}}$ )${\times }$B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$ ) $<1 - 4 \times 10^{-5}$ (95$\%$CL) and B( ${{\mathit Z}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit \gamma}}$ )${\times }$B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ ) $<0.7 - 2 \times 10^{-5}$ (95$\%$CL) in the range 20 $<{\mathit m}_{{{\mathit H}^{0}}}$ $<$80 GeV.
  References:
SIRUNYAN 2018F
JHEP 1801 054 Search for Resonant and Nonresonant Higgs Boson Pair Production in the ${\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit \ell}}{{\mathit \nu}}$ Final State in Proton-Proton Collisions at $\sqrt {s }$ = 13 TeV
AABOUD 2017
PL B764 11 Search for Heavy Resonances Decaying to a ${{\mathit Z}}$ Boson and a Photon in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ =13 TeV with the ATLAS Detector
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
KHACHATRYAN 2017D
JHEP 1701 076 Search for High-Mass ${{\mathit Z}}{{\mathit \gamma}}$ Resonances in ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}}$ and ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \gamma}}$ Final States in Proton-Proton Collisions at $\sqrt {s }$ = 8 and 13 TeV
KHACHATRYAN 2017R
PL B767 147 Search for High-Mass Diphoton Resonances in Proton-Proton Collisions at 13 TeV and Combination with 8 TeV Search
SIRUNYAN 2017CN
PR D96 072004 Search for Higgs Boson Pair Production in the ${\mathit {\mathit b}}{\mathit {\mathit b}}{{\mathit \tau}}{{\mathit \tau}}$ Final State in Proton-Proton Collisions at $\sqrt {s }$ = 8 TeV
SIRUNYAN 2017Y
PL B772 363 Search for High-Mass ${{\mathit Z}}{{\mathit \gamma}}$ Resonances in Proton-Proton Collisions at $\sqrt {s }$ = 8 and 13 TeV using Jet Substructure Techniques
AABOUD 2016AB
EPJ C76 605 Search for the Higgs Boson Produced in Association with a #p{W} Boson and Decaying to Four #quark{b}-Quarks via Two Spin-Zero Particles in #p{p}#{p} Collisions at 13 TeV with the ATLAS Detector
AABOUD 2016H
JHEP 1609 001 Search for Resonances in Diphoton Events at $\sqrt {s }$ = 13 TeV with the ATLAS Detector
AABOUD 2016AE
JHEP 1609 173 Searches for Heavy Diboson Resonances in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 13 TeV with the ATLAS Detector
AABOUD 2016I
PR D94 052002 Search for Pair Production of Higgs Bosons in the ${\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}{\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}$ Final State using Proton-Proton Collisions at $\sqrt {s }$ = 13 TeV with the ATLAS Detector
AAD 2016C
JHEP 1601 032 Search for a High-Mass Higgs Boson Decaying to a ${{\mathit W}}$ Boson Pair in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
AAD 2016AX
EPJ C76 45 Search for an Additional, Heavy Higgs Boson in the ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit Z}}$ Decay Channel at $\sqrt {s }$ = 8 TeV in ${{\mathit p}}{{\mathit p}}$ Collision Data with the ATLAS Detector
AAD 2016L
EPJ C76 210 Search for New Phenomena in Events with at Least Three Photons Collected in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
AALTONEN 2016C
PR D93 112010 Search for a Low-Mass Neutral Higgs Boson with Suppressed Couplings to Fermions Using Events with Multiphoton Final States
KHACHATRYAN 2016BQ
PR D94 052012 Search for Two Higgs Bosons in Final States Containing Two Photons and Two Bottom Quarks in Proton-Proton Collisions at 8 TeV
KHACHATRYAN 2016M
PRL 117 051802 Search for Resonant Production of High-Mass Photon Pairs in Proton-Proton Collisions at $\sqrt {s }$ = 8 and 13 TeV
KHACHATRYAN 2016F
JHEP 1601 079 Search for a Very Light NMSSM Higgs Boson Produced in Decays of the 125 GeV Scalar Boson and Decaying into ${{\mathit \tau}}$ leptons in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV
KHACHATRYAN 2016P
PL B755 217 Searches for a Heavy Scalar Boson ${{\mathit H}}$ Decaying to a Pair of 125 GeV Higgs Bosons ${{\mathit h}}{{\mathit h}}$ or for a Heavy Pseudoscalar Boson ${{\mathit A}}$ Decaying to ${{\mathit Z}}{{\mathit h}}$, in the Final States with ${{\mathit h}}$ $\rightarrow$ ${{\mathit \tau}}{{\mathit \tau}}$
KHACHATRYAN 2016BG
EPJ C76 371 Search for Heavy Resonances Decaying to Two Higgs Bosons in Final States Containing Four ${\mathit {\mathit b}}$ Quarks
AAD 2015BK
EPJ C75 412 Search for Higgs Boson Pair Production in the ${\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}{\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}$ Final State from ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
AAD 2015BZ
PR D92 052002 Search for Higgs Bosons Decaying to ${{\mathit a}}{{\mathit a}}$ in the ${{\mathit \mu}}{{\mathit \mu}}{{\mathit \tau}}{{\mathit \tau}}$ Final State in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Experiment
AAD 2015CE
PR D92 092004 Searches for Higgs Boson Pair Production in the ${{\mathit h}}$ ${{\mathit h}}$ $\rightarrow$ ${\mathit {\mathit b}}{\mathit {\mathit b}}{{\mathit \tau}}{{\mathit \tau}}$, ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit W}}{{\mathit W}^{*}}$, ${{\mathit \gamma}}{{\mathit \gamma}}{\mathit {\mathit b}}{\mathit {\mathit b}}$, ${\mathit {\mathit b}}{\mathit {\mathit b}}{\mathit {\mathit b}}{\mathit {\mathit b}}$ Channels with the ATLAS Detector
AAD 2015H
PRL 114 081802 Search For Higgs Boson Pair Production in the ${{\mathit \gamma}}{{\mathit \gamma}}{\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}$ Final State using ${{\mathit p}}{{\mathit p}}$ Collision Data at $\sqrt {s }$ = 8 TeV from the ATLAS Detector
AAD 2015S
PL B744 163 Search for a $\mathit CP$-odd Higgs Boson Decaying to $\mathit Zh$ in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
KHACHATRYAN 2015BB
PL B750 494 Search for Diphoton Resonances in the Mass Range from 150 to 850 GeV in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV
KHACHATRYAN 2015O
PL B748 255 Search for Narrow High-Mass Resonances in Proton$−$Proton Collisions at$\sqrt {s }$ = 8 TeV Decaying to a ${{\mathit Z}}$ and a Higgs Boson
KHACHATRYAN 2015AW
JHEP 1510 144 Search for a Higgs Boson in the Mass Range from 145 to 1000 GeV Decaying to a Pair of ${{\mathit W}}$ or ${{\mathit Z}}$ Bosons
KHACHATRYAN 2015R
PL B749 560 Search for Resonant Pair Production of Higgs Bosons Decaying to Two Bottom Quark-Antiquark Pairs in Proton-Proton Collisions at 8 TeV
KHACHATRYAN 2015N
PL B748 221 Search for a Pseudoscalar Boson Decaying into a ${{\mathit Z}}$ Boson and the 125 GeV Higgs Boson in ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}$ Final States
AAD 2014M
PR D89 032002 Search for a Multi-Higgs-Boson Cascade in ${{\mathit W}^{+}}{{\mathit W}^{-}}{\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}$ Events with the ATLAS Detector in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV
AAD 2014AP
PRL 113 171801 Search for Scalar Diphoton Resonances in the Mass Range $65 - 600$ GeV with the ATLAS Detector in ${{\mathit p}}{{\mathit p}}$ Collision Data at $\sqrt {s }$ = 8 TeV
CHATRCHYAN 2014G
JHEP 1401 096 Measurement of Higgs Boson Production and Properties in the ${{\mathit W}}{{\mathit W}}$ Decay Channel with Leptonic Final States
KHACHATRYAN 2014P
EPJ C74 3076 Observation of the Diphoton Decay of the Higgs Boson and Measurement of its Properties
AALTONEN 2013P
PRL 110 121801 Search for a Two-Higgs-Boson Doublet Using a Simplified Model in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
CHATRCHYAN 2013BJ
PL B726 564 Search for a Non-Standard-Model Higgs Boson Decaying to a Pair of New Light Bosons in Four-Muon Final States
AALTONEN 2011P
PRL 107 031801 Search for a Very Light $\mathit CP$-Odd Higgs Boson in Top Quark Decays from ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
ABBIENDI 2010
PL B682 381 Search for Invisibly Decaying Higgs Bosons in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}^{0}}{{\mathit h}^{0}}$ Production at $\sqrt {s }$ = $183 - 209$ GeV
SCHAEL 2010
JHEP 1005 049 Search for Neutral Higgs Bosons Decaying into Four Taus at LEP2
ABAZOV 2009V
PRL 103 061801 Search for Next-to-Minimal Supersymmetric Higgs Bosons in the ${{\mathit h}}$ $\rightarrow$ ${{\mathit a}}{{\mathit a}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit \mu}}{{\mathit \mu}}{{\mathit \mu}}$ , ${{\mathit \mu}}{{\mathit \mu}}{{\mathit \tau}}{{\mathit \tau}}$ Channels using ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96$~$TeV
ABBIENDI 2005A
EPJ C40 317 Flavour-Independent $\mathit h{}^{0}\mathit A{}^{0}$ Search and Two Higgs Doublet Model Interpretation of Neutral Higgs Boson Searches at LEP
ABBIENDI 2004K
PL B597 11 Flavor Independent Search for Higgs Bosons Decaying into Hadronic Final States in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at LEP
ABDALLAH 2004
EPJ C32 145 Final Results from DELPHI on the Searches for SM and MSSM Neutral Higgs Bosons
ACHARD 2004B
PL B583 14 Flavor Independent Search for Neutral Higgs Bosons at LEP
ACHARD 2004F
PL B589 89 Search for Anomalous Couplings in the Higgs Sector at LEP
ABBIENDI 2003F
EPJ C27 311 Decay Mode Independent Searches for New Scalar Bosons with the OPAL Detector at LEP
ABBIENDI 2003G
EPJ C27 483 Search for a Low Mass $\mathit CP$ Odd Higgs Boson in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions with the OPAL Detector at LEP-2
HEISTER 2002M
PL B544 25 A Flavor Independent Higs Boson Search in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at $\sqrt {s }$ up to 209-GeV
HEISTER 2002L
PL B544 16 Search for ${{\mathit \gamma}}{{\mathit \gamma}}$ Decays on a Higgs Boson in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at $\sqrt {s }$ up to 209-GeV
ABBIENDI 2001E
EPJ C18 425 Two Higgs Doublet Model and Model Independent Interpretation of Neutral Higgs Boson Searches
ACCIARRI 2000R
PL B489 102 Search for Anomalous Couplings in the Higgs Sector at LEP
GONZALEZ-GARCIA 1998B
PR D57 7045 Search for Nonstandard Higgs Boson in Diphoton Events at ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions
KRAWCZYK 1997
PR D55 6968 Constraining te Two Higgs Doublet Model by Present and Future ($\mathit g-2)_{{{\mathit \mu}}}$ Data
ALEXANDER 1996H
ZPHY C71 1 Search for a Narrow Resonance in ${{\mathit Z}^{0}}$ Decays into Hadrons and Isolated Photons
ABDALLAH 2004N
EPJ C37 405 Determination of the ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$( ${{\mathit \gamma}}$) Cross-Section at LEP 2
ABBOTT 1998
PRL 80 442 Experimental Search for Chargino and Neutralino Production via Gauge Mediated Supersymmetry Breaking Models
AABOUD 2017CJ
JHEP 1708 008 Polarisations of the ${{\mathit Z}}$ and ${{\mathit W}}$ Bosons in the Processes ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit H}}$ and ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit W}^{\pm}}{{\mathit H}}$