193 research outputs found

### Exotic Higgs Decay via Charged Higgs

The most common search channel for heavy neutral Higgses in models with an
extension of the Standard Model Higgs sector is $A/H^0\rightarrow \tau\tau$,
which becomes ineffective when new decay modes of $A/H^0$ open. In this paper,
we analyzed two such channels involving charged Higgses in the final states:
$A/H^0 \rightarrow W^\pm H^\mp$ and $H^0 \rightarrow H^+H^-$. With the
consequent decay of $H^\pm\rightarrow \tau\nu$, we found that the limits for
$\sigma\times{BR}(gg \rightarrow A/H^0 \rightarrow W^\pm H^\mp)\times
{BR}(H^\pm \rightarrow \tau \nu)$ vary from 30 to 10 fb for $m_{A/H^0}$ between
300 and 1000 GeV for 95% C.L. exclusion, and about 80 to 30 fb for 5$\sigma$
discovery. For $H^+H^-$ mode, 95% C.L. limits on $\sigma\times {BR}(gg\to
H^0\to H^+ H^-)\times {BR}^2(H^\pm\to \tau\nu)$ vary from 9 to 4 fb for
$m_{H^0}$ between 400 and 1000 GeV, while the 5$\sigma$ reach is about 20 to 10
fb. We further interpret the cross section limits in the Type II 2HDM parameter
space. While $A\rightarrow W^\pm H^\mp$ offers great sensitivity in both
$\sin(\beta-\alpha)$ versus $\tan\beta$ and $m_A$ versus $\tan\beta$ parameter
space, $H^0\rightarrow H^+ H^-$ can cover most of the parameter space for
$H^0$. Reach in $H^0\rightarrow W^\pm H^\mp$ is more limited, especially for
$m_{H^0}>2 m_{H^\pm}$. It is, however, complementary to $H^0\rightarrow H^+
H^-$ when ${BR}(H^0\rightarrow H^+ H^-)$ is accidentally suppressed.Comment: 19 pages, 11 figures, version appear in JHE

### Dark Matter in the Left Right Twin Higgs Model

In the left-right twin Higgs model, one of the neutral Higgses is a natural
candidate for WIMP dark matter. We analyzed the dark matter relic density in
this framework and identified regions of parameter space that provide the right
amount of dark matter. We also studied the dark matter in the more general
inert Higgs doublet model in which the mass splittings between the dark matter
and other particles do not follow the relations in the left-right twin Higgs
model.Comment: 18 page

### Exotic Decays Of A Heavy Neutral Higgs Through HZ/AZ Channel

Models of electroweak symmetry breaking with extended Higgs sectors are
theoretically well motivated. In this study, we focus on the Two Higgs Doublet
Model with a low energy spectrum containing scalars $H$ and a pseudoscalar $A$.
We study the decays $A\rightarrow HZ$ or $H\rightarrow AZ$, which could reach
sizable branching fractions in certain parameter regions. With detailed
collider analysis, we obtain model independent exclusion bounds as well as
discovery reach at the 14 TeV LHC for the process: $gg\rightarrow
A/H\rightarrow HZ/AZ$, looking at final states bbll, \tau\tau ll and ZZZ(4l2j)
for l =e,\mu. We further interpret these bounds in the context of the Type II
Two Higgs Doublet Model, considering three different classes of processes:
$A\rightarrow h^0Z$, $A\rightarrow H^0Z$, and $H^0 \rightarrow AZ$, in which
$h^0$ and $H^0$ are the light and heavy CP-even Higgses respectively. For 100
fb$^{-1}$ integrated luminosity at the 14 TeV LHC, we find that for parent
particle mass around 300-400 GeV, $A\rightarrow h^0Z$ has the greatest reach
when $H^0$ is interpreted as the 126 GeV Higgs: most regions in the
tan\beta-sin(\beta-\alpha) parameter space can be covered by exclusion and
discovery. For 126 GeV $h^0$, only relatively small tan\beta<10 (5) can be
reached by exclusion (discovery). For $A\rightarrow H^0Z$, the reach is
typically restricted to sin$(\beta-\alpha)\sim\pm 1$ with tan\beta <10 in bbll
and \tau\tau ll channels. The ZZZ (4l2j) channel, on the other hand, covers a
wide range of 0.3<|sin(\beta-\alpha)|<1 for tan\beta<4. $H^0\rightarrow AZ$
typically favors negative values of sin(\beta-\alpha), with exclusion/discovery
reach possibly extending to all values of tan\beta. A study of exotic decays of
extra Higgses would extend the reach at the LHC and provides nice
complementarity to conventional Higgs search channels.Comment: 32 pages, 21 figure

### Light Charged Higgs Bosons to AW/HW via Top Decay

While current ATLAS and CMS measurements exclude a light charged Higgs
($m_{H^\pm}<160$ GeV) for most of the parameter region in the context of the
MSSM scenarios, these bounds are significantly weakened in the Type II 2HDM
once the exotic decay channel into a lighter neutral Higgs, $H^\pm \to AW/HW$,
is open. In this study, we examine the possibility of a light charged Higgs
produced in top decay via single top or top pair production, with the
subsequent decay $H^\pm \rightarrow AW/HW$, which can reach a sizable branching
fraction at low $\tan\beta$ once it is kinematically permitted. With a detailed
collider analysis, we obtain exclusion and discovery bounds for the 14 TeV LHC
assuming the existence of a 70 GeV neutral scalar. Assuming ${\rm BR}(H^\pm
\rightarrow AW/HW)=100\%$ and ${\rm BR}(A/H \rightarrow \tau\tau)=8.6\%$, the
95% exclusion limits on ${\rm BR}(t \rightarrow H^+ b)$ are about 0.2% and
0.03% for single top and top pair production respectively, with an integrated
luminosity of 300 ${\rm fb}^{-1}$. The discovery reaches are about 3 times
higher. In the context of the Type II 2HDM, discovery is possible at both large
$\tan\beta > 17$ for 155 GeV $< m_{H^\pm} <$ 165 GeV, and small $\tan\beta < 6$
over the entire mass range. Exclusion is possible in the entire $\tan\beta$
versus $m_{H^\pm}$ plane except for charged Higgs masses close to the top
threshold. The exotic decay channel $H^\pm \to AW/HW$ is therefore
complementary to the conventional $H^\pm \rightarrow \tau\nu$ channel.Comment: 21 pages. arXiv admin note: text overlap with arXiv:1408.411

### Probing Exotic Charged Higgs Decays in the Type-II 2HDM through Top Rich Signal at a Future 100 TeV pp Collider

The exotic decay modes of non-Standard Model Higgs bosons are efficient in
probing the hierarchical Two Higgs Doublet Models (2HDM). In particular, the
decay mode $H^\pm\to HW^\pm$ serves as a powerful channel in searching for
charged Higgses. In this paper, we analyzed the reach for $H^\pm\to HW^\pm \to
t\bar{t}W$ at a 100 TeV $pp$ collider, and showed that it extends the reach of
the previously studied $\tau\tau W$ final states once above the top threshold.
Top tagging technique is used, in combination with the boosted decision tree
classifier. Almost the entire hierarchical Type-II 2HDM parameter space can be
probed via the combination of all channels at low $\tan\beta$ region.Comment: 17 page

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