# Mass Limits for ${{\boldsymbol A}^{0}}$ (Pseudoscalar Higgs Boson) in Supersymmetric Models INSPIRE search

VALUE (GeV) CL% DOCUMENT ID TECN  COMMENT
$> 90.4$ 1
 2008 B
DLPH $\mathit E_{{\mathrm {cm}}}{}\leq{}$209 GeV
$\bf{> 93.4}$ 95 2
 2006 B
LEP $\mathit E_{{\mathrm {cm}}}{}\leq{}$209 GeV
$>85.0$ 95 3, 4
 2004 M
OPAL $\mathit E_{{\mathrm {cm}}}{}\leq{}$209 GeV
$>86.5$ 95 3, 5
 2002 H
L3 $\mathit E_{{\mathrm {cm}}}{}\leq{}$209 GeV, tan $\beta >0.4$
$>90.1$ 95 3, 6
 2002
ALEP $\mathit E_{{\mathrm {cm}}}{}\leq{}$209 GeV, tan $\beta >0.5$
• • • We do not use the following data for averages, fits, limits, etc. • • •
7
 2018 G
ATLS ${{\mathit H}_{{2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$
8
 2018 A
CMS ${{\mathit H}_{{2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$
9
 2016 AA
ATLS ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$
10
 2016 A
CMS ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$
11
 2016 P
CMS ${{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ , ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit H}^{0}}$
12
 2015 AY
CMS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit b}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$
13
 2014 AW
ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}}{{\mathit \tau}}$
14
 2014 M
CMS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}}{{\mathit \tau}}$
15
 2013 O
ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ , ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$
16
 2013 T
LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$
17
 2013 AG
CMS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit b}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$
18
 2012 AQ
TEVA ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit b}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$
19
 2012 X
CDF ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit b}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$
20
 2012 G
D0 ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$
21
 2012 K
CMS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$
22
 2011 K
D0 ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit b}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$
23
 2011 W
D0 ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit b}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$
24
 2009 AR
CDF ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit X}}$ , ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$
25
 2005 Q
CDF ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}{+}$ ${{\mathit X}}$
26
 2003 G
OPAL ${{\mathit H}_{{1}}^{0}}$ $\rightarrow$ ${{\mathit A}^{0}}{{\mathit A}^{0}}$
27
 2002
RVUE
1  ABDALLAH 2008B give limits in eight $\mathit CP$-conserving benchmark scenarios and some $\mathit CP$-violating scenarios. See paper for excluded regions for each scenario. Supersedes ABDALLAH 2004 .
2  SCHAEL 2006B make a combined analysis of the LEP data. The quoted limit is for the $\mathit m{}^{{\mathrm {max}}}_{h}$ scenario with ${\mathit m}_{{{\mathit t}}}$ = 174.3 GeV. In the $\mathit CP$-violating CPX scenario no lower bound on ${\mathit m}_{{{\mathit H}_{{1}}^{0}}}$ can be set at 95$\%$ CL. See paper for excluded regions in various scenarios. See Figs. $2 - 6$ and Tabs. $14 - 21$ for limits on ${\mathit \sigma (}$ ${{\mathit Z}}{{\mathit H}^{0}}{)}\cdot{}$ B( ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ ) and ${\mathit \sigma (}$ ${{\mathit H}_{{1}}^{0}}{{\mathit H}_{{2}}^{0}}{)}\cdot{}$ B(${{\mathit H}_{{1}}^{0}},{{\mathit H}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ ).
3  Search for ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}_{{1}}^{0}}{{\mathit A}^{0}}$ in the final states ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ and ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ , and ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit H}_{{1}}^{0}}{{\mathit Z}}$ . Universal scalar mass of 1$~$TeV, SU(2) gaugino mass of 200 GeV, and $\mu$= $-200$ GeV are assumed, and two-loop radiative corrections incorporated. The limits hold for ${\mathit m}_{{{\mathit t}}}$=175 GeV, and for the $\mathit m{}^{{\mathrm {max}}}_{h}$ scenario.
4  ABBIENDI 2004M exclude 0.7 $<$ tan ${{\mathit \beta}}$ $<$ 1.9, assuming ${\mathit m}_{{{\mathit t}}}$ = 174.3 GeV. Limits for other MSSM benchmark scenarios, as well as for $\mathit CP$ violating cases, are also given.
5  ACHARD 2002H also search for the final state ${{\mathit H}_{{1}}^{0}}$ ${{\mathit Z}}$ $\rightarrow$ 2 ${{\mathit A}^{0}}{{\mathit q}}{{\overline{\mathit q}}}$ , ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$ . In addition, the MSSM parameter set in the large-$\mu$'' and no-mixing'' scenarios are examined.
6  HEISTER 2002 excludes the range $0.7<$tan $\beta <2.3$. A wider range is excluded with different stop mixing assumptions. Updates BARATE 2001C.
7  AABOUD 2018G search for production of ${{\mathit H}_{{2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ by gluon fusion and ${{\mathit b}}$-associated prodution in 36.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 7 for the limits on cross section times branching ratio for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$, ${\mathit m}_{{{\mathit A}^{0}}}$ = $0.2 - 2.25$ TeV, and Fig. 10 for excluded regions in the ${\mathit m}_{{{\mathit A}^{0}}}-$ tan $\beta$ plane in several MSSM scenarios.
8  SIRUNYAN 2018A search for production of a scalar resonance decaying to ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 35.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 5 for the limits on cross section times branching ratio for the resonance mass = $250 - 900$ GeV and also for excluded regions in the ${\mathit m}_{{{\mathit A}^{0}}}$ $−$ tan $\beta$ plane in the hMSSM scenario.
9  AABOUD 2016AA search for production of a Higgs boson in gluon fusion and in association with a ${{\mathit b}}{{\overline{\mathit b}}}$ pair followed by the decay ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 3.2 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. See their Fig. 5(a, b) for limits on cross section times branching ratio for ${\mathit m}_{{{\mathit A}^{0}}}$ = $200 - 1200$ GeV, and Fig. 5(c, d) for the excluded region in the MSSM parameter space in the ${{\mathit m}}{}^{{\mathrm {mod+}}}_{h}$ and hMSSM scenarios.
10  KHACHATRYAN 2016A search for production of a Higgs boson in gluon fusion and in association with a ${{\mathit b}}{{\overline{\mathit b}}}$ pair followed by the decay ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ in 5.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV and 19.3 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 7 for the excluded region in the MSSM parameter space in the ${{\mathit m}}{}^{{\mathrm {mod+}}}_{h}$ benchmark scenario and Fig. 9 for limits on cross section times branching ratio.
11  KHACHATRYAN 2016P search for gluon fusion production of an ${{\mathit H}_{{2}}^{0}}$ decaying to ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ and 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. 12 for excluded region in the tan $\beta$ $−$ cos $(\beta −\alpha )$ plane for ${\mathit m}_{{{\mathit H}_{{2}}^{0}}}$ = ${\mathit m}_{{{\mathit A}^{0}}}$ = 300 GeV.
12  KHACHATRYAN 2015AY search for production of a Higgs boson in association with a ${{\mathit b}}$ quark in the decay ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ in 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV and combine with 7 TeV data. See their Fig. 6 for the limits on cross section times branching ratio for ${\mathit m}_{{{\mathit A}^{0}}}$ = $100 - 900$ GeV and Figs. $7 - 9$ for the excluded region in the MSSM parameter space in various benchmark scenarios.
13  AAD 2014AW search for production of a Higgs boson followed by the decay ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 19.5--20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. See their Fig. 11 for the limits on cross section times branching ratio and their Figs. 9 and 10 for the excluded region in the MSSM parameter space. For ${\mathit m}_{{{\mathit A}^{0}}}$ = 140 GeV, the region tan ${{\mathit \beta}}>$ 5.4 is excluded at 95$\%$ CL in the ${{\mathit m}}{}^{{\mathrm {max}}}_{h}$ scenario.
14  KHACHATRYAN 2014M search for production of a Higgs boson in gluon fusion and in association with a ${{\mathit b}}$ quark followed by the decay ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 4.9 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. 7 and 8 for one- and two-dimensional limits on cross section times branching ratio and their Figs. 5 and 6 for the excluded region in the MSSM parameter space. For ${\mathit m}_{{{\mathit A}^{0}}}$ = 140 GeV, the region tan ${{\mathit \beta}}>$ 3.8 is excluded at 95$\%$ CL in the ${{\mathit m}}{}^{{\mathrm {max}}}_{h}$ scenario.
15  AAD 2013O search for production of a Higgs boson in the decay ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ and ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ with $4.7 - 4.8$ fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. See their Fig. 6 for the excluded region in the MSSM parameter space and their Fig. 7 for the limits on cross section times branching ratio. For ${\mathit m}_{{{\mathit A}^{0}}}$ = $110 - 170$ GeV, tan ${{\mathit \beta}}{ {}\gtrsim{} }$ 10 is excluded, and for tan ${{\mathit \beta}}$ = 50, ${\mathit m}_{{{\mathit A}^{0}}}$ below 470 GeV is excluded at 95$\%$ CL in the $\mathit m{}^{{\mathrm {max}}}_{h}$ scenario.
16  AAIJ 2013T search for production of a Higgs boson in the forward region in the decay ${{\mathit H}_{{1,2}}^{0}}$/ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in 1.0 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. See their Fig. 2 for the limits on cross section times branching ratio and the excluded region in the MSSM parameter space.
17  CHATRCHYAN 2013AG search for production of a Higgs boson in association with a ${{\mathit b}}$ quark in the decay ${{\mathit H}_{{1,2}}^{0}}$/ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ in $2.7 - 4.8$ fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. See their Fig. 6 for the excluded region in the MSSM parameter space and Fig. 5 for the limits on cross section times branching ratio. For ${\mathit m}_{{{\mathit A}^{0}}}$ = $90 - 350$ GeV, upper bounds on tan ${{\mathit \beta}}$ of $18 - 42$ at 95$\%$ CL are obtained in the $\mathit m{}^{{\mathrm {max}}}_{h}$ scenario with ${{\mathit \mu}}$ = +200 GeV.
18  AALTONEN 2012AQ combine AALTONEN 2012X and ABAZOV 2011K. See their Table I and Fig. 1 for the limit on cross section times branching ratio and Fig. 2 for the excluded region in the MSSM parameter space.
19  AALTONEN 2012X search for associated production of a Higgs boson and a ${{\mathit b}}$ quark in the decay ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ , with 2.6 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. See their Table III and Fig. 15 for the limit on cross section times branching ratio and Figs. 17, 18 for the excluded region in the MSSM parameter space.
20  ABAZOV 2012G search for production of a Higgs boson in the decay ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ with 7.3 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV and combine with ABAZOV 2011W and ABAZOV 2011K. See their Figs. 4, 5, and 6 for the excluded region in the MSSM parameter space. For ${\mathit m}_{{{\mathit A}^{0}}}$ = $90 - 180$ GeV, tan ${{\mathit \beta}}{ {}\gtrsim{} }$ 30 is excluded at 95$\%$ CL. in the $\mathit m{}^{{\mathrm {max}}}_{h}$ scenario.
21  CHATRCHYAN 2012K search for production of a Higgs boson in the decay ${{\mathit H}_{{1,2}}^{0}}$ $/$ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ with 4.6 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. See their Fig. 3 and Table 4 for the excluded region in the MSSM parameter space. For ${\mathit m}_{{{\mathit A}^{0}}}$ = 160 GeV, the region tan ${{\mathit \beta}}$ $>$ 7.1 is excluded at 95$\%$ CL in the $\mathit m{}^{{\mathrm {max}}}_{h}$ scenario. Superseded by KHACHATRYAN 2014M.
22  ABAZOV 2011K search for associated production of a Higgs boson and a ${{\mathit b}}$ quark, followed by the decay ${{\mathit H}_{{1,2}}^{0}}$/ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ , in 5.2 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. See their Fig.$~$5/Table$~$2 for the limit on cross section times branching ratio and Fig.$~$6 for the excluded region in the MSSM parameter space for ${{\mathit \mu}}$ = $-200$ GeV.
23  ABAZOV 2011W search for associated production of a Higgs boson and a ${{\mathit b}}$ quark, followed by the decay ${{\mathit H}_{{1,2}}^{0}}$/ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}}{{\mathit \tau}}$ , in 7.3 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. See their Fig.$~$2 for the limit on cross section times branching ratio and for the excluded region in the MSSM parameter space.
24  AALTONEN 2009AR search for Higgs bosons decaying to ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ in two doublet models in 1.8 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. See their Fig. 2 for the limit on $\sigma \cdot{}$B( ${{\mathit H}^{0}_{{{1,2}}}}$ / ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ ) for different Higgs masses, and see their Fig. 3 for the excluded region in the MSSM parameter space.
25  ACOSTA 2005Q search for ${{\mathit H}^{0}_{{{1,2}}}}/{{\mathit A}^{0}}$ production in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.8 TeV with ${{\mathit H}^{0}_{{{1,2}}}}$/ ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ . At ${\mathit m}_{{{\mathit A}^{0}}}$ = 100 GeV, the obtained cross section upper limit is above theoretical expectation.
26  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 no-mixing scenario, the region ${\mathit m}_{{{\mathit H}_{{1}}^{0}}}$ = 45-85 GeV and ${\mathit m}_{{{\mathit A}^{0}}}$ = 2-9.5 GeV is excluded at 95$\%$ CL.
27  AKEROYD 2002 examine the possibility of a light ${{\mathit A}^{0}}$ with tan $\beta <$1. Electroweak measurements are found to be inconsistent with such a scenario.
References:
 AABOUD 2018G
JHEP 1801 055 Search for Additional Heavy Neutral Higgs and Gauge Bosons in the ditau Final State Produced in 36 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 13 TeV with the ATLAS Detector
 SIRUNYAN 2018A
PL B778 101 Search for Higgs Boson Pair Production in Events with Two Bottom Quarks and Two Tau Leptons in Proton-Proton Collisions at $\sqrt {s }$ = 13 TeV
 AABOUD 2016AA
EPJ C76 585 Search for Minimal Supersymmetric Standard Model Higgs Bosons $\mathit H/\mathit A$ and for a ${{\mathit Z}^{\,'}}$ Boson in the ${{\mathit \tau}}{{\mathit \tau}}$ Final State Produced in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 13 TeV with the ATLAS Detector
 KHACHATRYAN 2016A
PL B752 221 Search for Neutral MSSM Higgs Bosons Decaying to ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 and 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 2015AY
JHEP 1511 071 Search for Neutral MSSM Higgs Bosons Decaying into a Pair of Bottom Quarks
JHEP 1411 056 Search for Neutral Higgs Bosons of the Minimal Supersymmetric Standard Model in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
 KHACHATRYAN 2014M
JHEP 1410 160 Search for Neutral MSSM Higgs Bosons Decaying to a Pair of tau Leptons in ${{\mathit p}}{{\mathit p}}$ Collisions
JHEP 1302 095 Search for the Neutral Higgs Bosons of the Minimal Supersymmetric Standard Model in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV with the ATLAS Detector
 AAIJ 2013T
JHEP 1305 132 Limits on Neutral Higgs Boson Production in the Forward Region in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
 CHATRCHYAN 2013AG
PL B722 207 Search for a Higgs Boson Decaying into a ${\mathit {\mathit b}}$-Quark Pair and Produced in Association with ${\mathit {\mathit b}}$ Quarks in Proton$−$Proton Collisions at 7 TeV
 AALTONEN 2012X
PR D85 032005 Search for Higgs Bosons Produced in Association with ${\mathit {\mathit b}}$ Quarks
 AALTONEN 2012AQ
PR D86 091101 Search for Neutral Higgs Bosons in Events with Multiple Bottom Quarks at the Tevatron
 ABAZOV 2012G
PL B710 569 Search for Higgs Bosons of the Minimal Supersymmetric Standard Model in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 7 TeV
 CHATRCHYAN 2012K
PL B713 68 Search for Neutral Higgs Bosons Decaying to tau Pairs in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
 ABAZOV 2011W
PRL 107 121801 Search for Neutral Minimal Supersymmetric Standard Model Higgs Bosons Decaying to Tau Pairs Produced in Association with ${\mathit {\mathit b}}$ Quarks in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 ABAZOV 2011K
PL B698 97 Search for Neutral Higgs Bosons in the Multi-${\mathit {\mathit b}}$-Jet Topology in 5.2 fb${}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 AALTONEN 2009AR
PRL 103 201801 Search for Higgs Bosons Predicted in Two-Higgs-Doublet Models via Decays to Tau Lepton Pairs in 1.96 TeV ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions
 ABDALLAH 2008B
EPJ C54 1 Higgs Boson Searches in $\mathit CP$-Conserving and $\mathit CP$-Violating MSSM Scenarios with the DELPHI Detector
 SCHAEL 2006B
EPJ C47 547 Search for Neutral MSSM Higgs Bosons at LEP
 ACOSTA 2005Q
PR D72 072004 Search for Supersymmetric Higgs Bosons in the di-tau Decay Mode in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.8 TeV
 ABBIENDI 2004M
EPJ C37 49 Search for Neutral Higgs Boson in $\mathit CP$-Conserving and $\mathit CP$-Violating MSSM Scenarios
 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
 ACHARD 2002H
PL B545 30 Search for Neutral Higgs Bosons of the Minimal Supersymmetric Standard Model in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Interactions at $\sqrt {s }$ = 209-GeV
 AKEROYD 2002
PR D66 037702 On the Possibility of a Very Light ${{\mathit A}^{0}}$ at Low tan$\beta$ in the Minimal Supersymmetric Standard Mdel
 HEISTER 2002
PL B526 191 Final Results of the Searches for Neutral Higgs Bosons in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at$\sqrt {s }$ up to 209 GeV