551 research outputs found
LHC searches for heavy neutral Higgs bosons with a top jet substructure analysis
We study the LHC searches for the heavy -odd Higgs boson and
-even Higgs boson in the context of general two-Higgs-doublet model.
Specifically, we consider the decay mode of through the or associated production channels. In the so-called
"alignment limit" of the two-Higgs-doublet model, this decay mode can be the
most dominant one. By employing the HEPTopTagger and the
multi-variable-analysis method, we present the search sensitivities for both
-odd Higgs boson and -even Higgs boson via these channels at
the high-luminosity LHC runs.Comment: 21 pages, 5 figures; v2: matches the published versio
Simplified Supersymmetry with Sneutrino LSP at 8 TeV LHC
The current searches of supersymmetry (SUSY) are based on the neutralino
lightest sparticle (LSP). In this article we instead focus on SUSY with
sneutrino LSP. It is well motivated in many contexts, especially in which
sneutrino services as a dark matter candidate. We first develop a simplified
model, which contains the stop, chagino/neutralino and sneutrino, to describe
the LHC phenomenologies of a large class of models with sneutrino LSP. Then we
investigate bounds on the model using the SUSY searches at the 8 TeV LHC.
Strong exclusion limits are derived, e.g., masses of stop and chargino can be
excluded up to about 900 GeV and 550 GeV, respectively. We also propose
optimizations for some searches without turning to higher energy and
luminosity.Comment: 26 pages, 8 figures,Minor corrections,References adde
LHC searches for the CP-odd Higgs by the jet substructure analysis
The LHC searches for the CP-odd Higgs boson is studied (with masses from 300
GeV to 1 TeV) in the context of the general two-Higgs-doublet model. With the
discovery of the 125 GeV Higgs boson at the LHC, we highlight one promising
discovery channel of the hZ. This channel can become significant after the
global signal fitting to the 125 GeV Higgs boson in the general
two-Higgs-doublet model. It is particularly important in the scenario where two
CP-even Higgs bosons in the two-Higgs-doublet model have the common mass of 125
GeV. Since the final states involve a Standard-Model-like Higgs boson, we apply
the jet substructure analysis of the fat Higgs jet in order to eliminate the
Standard Model background sufficiently. After performing the kinematic cuts, we
present the LHC search sensitivities for the CP-odd Higgs boson with mass up to
1 TeV via this channel.Comment: 26 pages, 12 figures, submitted to Phys. Rev.
VQS: Linking Segmentations to Questions and Answers for Supervised Attention in VQA and Question-Focused Semantic Segmentation
Rich and dense human labeled datasets are among the main enabling factors for
the recent advance on vision-language understanding. Many seemingly distant
annotations (e.g., semantic segmentation and visual question answering (VQA))
are inherently connected in that they reveal different levels and perspectives
of human understandings about the same visual scenes --- and even the same set
of images (e.g., of COCO). The popularity of COCO correlates those annotations
and tasks. Explicitly linking them up may significantly benefit both individual
tasks and the unified vision and language modeling. We present the preliminary
work of linking the instance segmentations provided by COCO to the questions
and answers (QAs) in the VQA dataset, and name the collected links visual
questions and segmentation answers (VQS). They transfer human supervision
between the previously separate tasks, offer more effective leverage to
existing problems, and also open the door for new research problems and models.
We study two applications of the VQS data in this paper: supervised attention
for VQA and a novel question-focused semantic segmentation task. For the
former, we obtain state-of-the-art results on the VQA real multiple-choice task
by simply augmenting the multilayer perceptrons with some attention features
that are learned using the segmentation-QA links as explicit supervision. To
put the latter in perspective, we study two plausible methods and compare them
to an oracle method assuming that the instance segmentations are given at the
test stage.Comment: To appear on ICCV 201
Higgs Boson Mass and Complex Snuetrino Dark Matter in the Supersymmetric Inverse Seesaw Models
The discovery of a relatively heavy Standard Model (SM) -like Higgs boson
challenges naturalness of the minimal supersymmetric standard model (MSSM) from
both Higgs and dark matter (DM) sectors. We study these two aspects in the MSSM
extended by the low-scale inverse seesaw mechanism. Firstly, it admits a
sizable radiative correction on the Higgs boson mass m_h, up to \sim 4 GeV in
the case of an IR-fixed point of the coupling Y_\nu LH_u\nu^c and a large
sneutrino mixing. Secondly, the lightest sneutrino, highly complex as expected,
is a viable thermal DM candidate. Owing to the correct relic density and
XENON100, two cases survive: a Higgs-portal complex DM with mass lying around
the Higgs pole or above threshold, and a coannihilating DM with slim
prospect of detection. Given an extra family of sneutrinos, both scenarios
naturally work when we attempt to suppress the DM left-handed sneutrino
component, confronting with enhancing m_h.Comment: 19 pages, 6 figures, JHEP versio
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